Open Access. Powered by Scholars. Published by Universities.®

Polymer Chemistry Commons

Open Access. Powered by Scholars. Published by Universities.®

763 Full-Text Articles 1,075 Authors 176,321 Downloads 75 Institutions

All Articles in Polymer Chemistry

Faceted Search

763 full-text articles. Page 1 of 27.

Highly Conductive Solid Polymer Electrolytes: Poly(Ethylene Oxide)/Litfsi Blends, Zahra Alquraini 2018 Clark Atlanta University

Highly Conductive Solid Polymer Electrolytes: Poly(Ethylene Oxide)/Litfsi Blends, Zahra Alquraini

Electronic Theses & Dissertations Collection for Atlanta University & Clark Atlanta University

In this study, highly ionic conductive solid polymer electrolytes have been prepared by blending high molecular weight polyethylene oxide (PEO: MW 35,000 and 100,000) and bis(trifluoromethane)sulfonamide lithium (LiTFSI) salt. The ionic conductivities were determined for several compositions of the blends at different temperatures. A maximum ionic conductivity of 9.45 x 10-6 S cm-1 at 25 °C has been obtained for the blends containing PEO-35,000/LiTFSI at an ethylene oxide to lithium salt ratio (EO/Li+) of 5, whereas a maximum ionic conductivity 7.7 x 10-6 S cm-1 at 25 ...


Thienoisatin Oligomers As N-Type Molecular Semiconductors, Natalie M. Kadlubowski, Xuyi Luo, Jianguo Mei 2018 Purdue University

Thienoisatin Oligomers As N-Type Molecular Semiconductors, Natalie M. Kadlubowski, Xuyi Luo, Jianguo Mei

The Summer Undergraduate Research Fellowship (SURF) Symposium

Organic field effect transistors (OFETs) offer many advantages compared to traditional inorganic transistors, such as flexibility and solution processability. In this study we design and synthesize two thienoisatin-based organic semiconducting small molecules, then investigate their electronic properties in n-type OFETs. To introduce n-type charge transport, electron-withdrawing dicarbonitrile moieties were installed on thienoisoindigo and bis-thienoisatin molecules, which led to a quinoidal conjugation on thienoisoindigo, while maintaining an aromatic conjugation on the bis-thienoisatin. Following the syntheses, the molecules were characterized to determine highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels via cyclic voltammetry, as well as any potential ...


Development Of Mof@Polymer Composite Materials Through Bottom-Up Self-Assembly Techniques, Roberto C. Arbulu 2018 University of New Mexico

Development Of Mof@Polymer Composite Materials Through Bottom-Up Self-Assembly Techniques, Roberto C. Arbulu

Chemistry ETDs

MOF-based mixed matrix membranes (MMMs) are a promising new class of MOF/polymer composite materials. Currently, fabrication of MMMs is based on top-down methods with limited control over MOF positioning, integration, or morphology. This work focuses on the growth of well-defined one-dimensional (1-D) MOF nanostructures within the pores of a nanoporous polymer template, either commercially available or through the self-assembly of block co-polymers having tailor-designed surface functionalities. Studies were conducted using zeolitic imidazole framework-8 (ZIF-8) and polycarbonate track etched (PCTE) membranes, which demonstrated the feasibility of the outlined approach, and revealed the formation of distinct super- and nanostructures with controlled ...


An Entirely New Molecular Glue For Mof Using Unusual Structural Transformation Of A Coordination Polymer, Sukwoo Jung, Hangyeol Kim, Junseok Ahn 2018 Korea Science Academy

An Entirely New Molecular Glue For Mof Using Unusual Structural Transformation Of A Coordination Polymer, Sukwoo Jung, Hangyeol Kim, Junseok Ahn

The International Student Science Fair 2018

In this research, an entirely new molecular glue is reported. This ‘coordination polymer glue’ is synthesized from zinc metal and BDC-NPE(2,5-bis{4-[1-(4-nitrophenyl)ethylamino]butoxy}terephthalic acid). Molecular glue transforms from 1D coordination polymer to a 3D cross-linked framework, resulting in a phase change of solution to solid. The carboxylate group of this glue makes the preformed MOF bind to its framework. Therefore, when the solution of molecular glue is mixed with preformed MOF powder and heated, homogeneous and thin MOF film – MOF/ZnNPE film – is fabricated. The film is irrelevant to the kind of its substrate ...


Glucosamine From Hydrolysis Of 3d Printing Chitosan For Osteoarthritis Treatment, Ruj Dansriboon, Laphon Premcharoen 2018 Kamnoetvidya Science Academy

Glucosamine From Hydrolysis Of 3d Printing Chitosan For Osteoarthritis Treatment, Ruj Dansriboon, Laphon Premcharoen

The International Student Science Fair 2018

This project aims to introduce a new way for osteoarthritis treatment which is expected to increase in the future. Glucosamine is the main subject for a treatment, which can be derived by hydrolyzing chitosan. This project also includes extraction of chitosan from shrimp waste to make a worthy use of food waste from industry. In this project, 3D printer is applied to print chitosan gel since 3D printing is adjustable to form various shapes of the gel.

The research process begins with the extraction of chitosan from shrimp shells. For the next step, the percent of deacetylation of chitosan was ...


An Entirely New Molecular Glue For Mof Using Unusual Structural Transformation Of A Coordination Polymer, Sukwoo Jung, Hangyeol Kim, Junseok Ahn 2018 Korea Science Academy

An Entirely New Molecular Glue For Mof Using Unusual Structural Transformation Of A Coordination Polymer, Sukwoo Jung, Hangyeol Kim, Junseok Ahn

The International Student Science Fair 2018

In this research, an entirely new molecular glue is reported. This ‘coordination polymer glue’ is synthesized from zinc metal and BDC-NPE(2,5-bis{4-[1-(4-nitrophenyl)ethylamino]butoxy}terephthalic acid). Molecular glue transforms from 1D coordination polymer to a 3D cross-linked framework, resulting in a phase change of solution to solid. The carboxylate group of this glue makes the preformed MOF bind to its framework. Therefore, when the solution of molecular glue is mixed with preformed MOF powder and heated, homogeneous and thin MOF film – MOF/ZnNPE film – is fabricated. The film is irrelevant to the kind of its substrate ...


The Incorporation Of Phosphorus Into Block Copolymers And Their Self-Assembly, Benjamin F. Hisey 2018 The University of Western Ontario

The Incorporation Of Phosphorus Into Block Copolymers And Their Self-Assembly, Benjamin F. Hisey

Electronic Thesis and Dissertation Repository

The content of this thesis focuses on the incorporation of phosphorus into amphiphilic block copolymers (BCPs) for the realization of novel properties in the solution phase self-assembled materials derived from the BCPs. The incorporation was achieved through either attaching phosphorus to the terminus of already existing BCPs or the synthesis of novel BCPs from prepared or commercially available phosphorus containing monomers. The phosphorus containing polymers exhibited properties dependent on the existence of the phosphorus species in the BCPs. The first example of this is the modification of poly(ethylene oxide)-b-poly(ε-caprolactone) (PEO-b-PCL) copolymers by the attachment ...


Synthesis Of A Bipyridine Ligand For Metal-Triggered Supramolecular Polymers, Andrew D. Gould 2018 DePaul University

Synthesis Of A Bipyridine Ligand For Metal-Triggered Supramolecular Polymers, Andrew D. Gould

DePaul Discoveries

Intermolecular forces, such as H-bonding, ionic interactions and metal chelation between small molecules, can lead to the assembly of higher-order supramolecular nanostructures. A metal chelator, 2-(Pyridin-2-yl) pyridine-5-carboxylic Acid (a bipyridine derivative), is expected to aid in the formation of supramolecular structures as part of amphiphilic molecules that self-assemble in solution in the presence of metal ions. The bipyridine ligand currently under synthesis can be prepared through a five-step synthesis scheme. The second reaction of this synthesis (the coupling of two pyridine rings) resulted in a combination of the desired 1,2,5-isomer, as well as an unforeseen 1,2 ...


Glycopolymer Functionalization Of Polymersomes, Josh Jadischke 2018 The University of Western Ontario

Glycopolymer Functionalization Of Polymersomes, Josh Jadischke

Electronic Thesis and Dissertation Repository

Carbohydrates are important to cellular communication, recognition, and pathogenesis, making them a useful synthetic target for application in therapeutics and diagnosis. Synthetic carbohydrate presenting scaffolds can replicate or interrupt the binding interactions that occur in nature. Due to the weak nature of the monosaccharide-protein bond, most carbohydrate presenting scaffolds display saccharides in a multivalent manner to improve binding. Recently there has been an effort to combine carbohydrate containing scaffolds with polymersomes (vesicles composed of polymers), due to the structural resemblance of polymersome membranes to biological membranes. This thesis describes the progress towards functionalizing polymersomes with linear glycopolymers as a potential ...


Polymeric Hairy Nanoparticles With Helical Hairs: Synthesis And Self-Assembly, MD Hanif Uddin 2018 Atlanta University Center

Polymeric Hairy Nanoparticles With Helical Hairs: Synthesis And Self-Assembly, Md Hanif Uddin

Electronic Theses & Dissertations Collection for Atlanta University & Clark Atlanta University

Nanoscale particles based on the nature of building blocks often self-assemble into superstructures with distinctive spatial arrangements which can be used as functional materials for different application. Micro-phase separated hairy nanoparticle with helical hair can self-assemble to form supramolecular material which may mimic the properties and functions of the natural polymers such as protein and cellulose. Beside this hairy/core-shell nanoparticles also may find many applications such as in asymmetric catalysis, nano-fillers in tire and rubbers, model systems for biology, lithography and as sensors. In this work, we have successfully synthesized two hairy nanoparticles both of which has cross-linked polystyrene ...


Flame Retardancy Of Ferrocene Incorporated Epoxide, Sultan Alanazi 2018 Pittsburg State University

Flame Retardancy Of Ferrocene Incorporated Epoxide, Sultan Alanazi

Electronic Thesis Collection

Epoxy resins are thermosetting resins that are used in a variety of applications such as electrical and electronic devices. However, epoxy resins can be inherently flammable. To circumvent this problem, epoxy resins were prepared by incorporating ferrocene carboxylic acid into the epoxy prior to thermal setting, as a flame retardant. Ferrocene carboxylic acid was prepared by condensing o-chlorobenzoyl chloride with ferrocene followed by hydrolysis. The synthesized ferrocene carboxylic acid was characterized by 1H-NMR spectroscopy, 13C-NMR spectroscopy, and FT-IR spectroscopy. Epoxy films were then prepared by reacting ferrocene carboxylic acid (10, 15, and 20% by wt) with bisphenol A ...


Polymer Nanocomposites Containing High Aspect Ratio Particulates: Innovation In Co-Extruded Multilayer Barrier Films, Kevin Meyers 2018 The University of Southern Mississippi

Polymer Nanocomposites Containing High Aspect Ratio Particulates: Innovation In Co-Extruded Multilayer Barrier Films, Kevin Meyers

Dissertations

Delaminated montmorillonite (MMT) clay/ maleic anhydride grafted LLDPE nanocomposite multilayer films with alternating layers of LDPE were produced through multilayer co-extrusion. The MMT concentration within the nanocomposite layers was increased through annealing the films in the melt due to a mismatch in interdiffusion rates of the polymer layers. Analysis of the nanocomposite layers upon annealing revealed that the platelets impinged upon one another resulting in significant improvement in oxygen barrier in the multilayer system, exceeding the results of bulk nanocomposites.

Model analysis demonstrated that increasing the nanoplatelet aspect ratio or initial concentration in the filled layers would lead to even ...


Targeted Triple Drug Regimen For The Treatment Of Prostate Cancer, Tanuja Tummala 2018 Pittsburg State University

Targeted Triple Drug Regimen For The Treatment Of Prostate Cancer, Tanuja Tummala

Electronic Thesis Collection

Prostate cancer is the most common amongst men. According to ACS 2018 statistics, about 164,690 new cases appear and 29,430 deaths occur. Nearly 6 in 10 cases are diagnosed in men over 50 years of age and often there are no early symptoms. The treatment options include surgery, chemotherapy, hormonal therapy and/or radiation and it can often be treated successfully. However, the poor management and adverse effects demanded ways to find better treatment option. Towards the development of a personalized medicine for prostate cancer treatment, we proposed to design prostate cancer targeting magnetic nanoplatform. This integrates various ...


Investigations Into Ring-Opening Polymerization Of Functionalized Ε-Caprolactones, Danielle N. Coderre, Matthew K. Kiesewetter 2018 University of Rhode Island

Investigations Into Ring-Opening Polymerization Of Functionalized Ε-Caprolactones, Danielle N. Coderre, Matthew K. Kiesewetter

Senior Honors Projects

Polymers are defined as large molecules constructed from small, repeating units (monomers) which make up everyday items, such as: plastic bags and bottles, waterproof coatings, pipes, etc. H-bonding urea (U) or thiourea (TU) catalysts paired with base cocatalysts used for organocatalytic ring-opening polymerization (ROP) of cyclic esters have been shown to exhibit fast rates of polymerization and result in polymers with controlled molecular weights (Mn) and low polydispersity indexes (PDI). Additionally, organocatalytic ring-opening polymerization (ROP) techniques have been shown to be tolerant of the incorporation of functional groups into the monomer feed, which is vital for the catalytic synthesis of ...


Characterizing The Ductile-Brittle Transition Of Polyamide-11/ Purification And Characterization Of Boron Nitride Nanotubes, William Kim 2018 College of William and Mary

Characterizing The Ductile-Brittle Transition Of Polyamide-11/ Purification And Characterization Of Boron Nitride Nanotubes, William Kim

Undergraduate Honors Theses

Semi-crystalline polymers undergo a transition from ductile to brittle behavior that has traditionally been characterized by the molecular weight (Mw). However, using Mw as a determinant of the ductile brittle transition has been proven to be imprecise. To better understand the ductile-brittle transition, polyamide-11 (PA-11) was degraded in water and low molecular weight acids: acetic and butanoic. The Mw of PA-11 degraded 4 times faster in acetic and 8 times faster in butanoic acid than when aged in water. This accelerated aging technique separated the role of crystallinity from a changing molecular weight on ductility. This research shows that crystallinity ...


Biocompatible, Responsive Polysoaps Via Raft Copolymerization For The Delivery Of Model Cancer Therapeutics, Mason Dearborn 2018 The University of Southern Mississippi

Biocompatible, Responsive Polysoaps Via Raft Copolymerization For The Delivery Of Model Cancer Therapeutics, Mason Dearborn

Honors Theses

Many chemotherapeutic drugs are small, hydrophobic molecules that require water-soluble, biocompatible nanocarriers for enhanced vascular circulation. Existing polymeric carriers either conjugate the drug along a copolymer backbone or sequester drugs within a protected interior domain to be delivered to specific sites in the body. Such therapeutic systems must overcome a myriad of hurdles, beginning with complex, multi-step syntheses, followed by other inherent barriers that limit the efficiency of drug delivery at the targeted site. This work aims to circumvent a number of these issues using biocompatible, stimuli-responsive polysoaps that are capable of unimeric micelle formation, hydrophobic drug delivery, and triggered ...


Pro-Antimicrobial Networks Prepared Via Degradable Thiol-Ene Acetal Photopolymerization, Sarah Swilley 2018 The University of Southern Mississippi

Pro-Antimicrobial Networks Prepared Via Degradable Thiol-Ene Acetal Photopolymerization, Sarah Swilley

Honors Theses

A degradable, antimicrobial polymer network with acetal crosslink junctions derived from p-anisaldehyde (pA), a common constituent found in star anise extract, is reported. The p-anisaldehyde was converted into a bis-functional acetal alkene monomer, which serves as a pro-antimicrobial form of the active aldehyde and a building block for materials referred to as pro-antimicrobial polymer networks via degradable acetals (PANDAs). Subsequently, the bis-functional acetal alkene monomer was photopolymerized with a multifunctional thiol to yield a thiol-ene network. PANDAs exhibit surface erosion behavior and yield sustained release of pA over 38 days when exposed to neutral or biologically relevant conditions. The pA ...


Block-Copolymer Assisted Fabrication Of Anisotropic Plasmonic Nanostructures, Calbi J. Gunder 2018 Missouri State University

Block-Copolymer Assisted Fabrication Of Anisotropic Plasmonic Nanostructures, Calbi J. Gunder

MSU Graduate Theses

The anisotropic nanostructures of noble metals are of great interest for plasmonic applications due to the possibility of tuning the localized surface plasmon resonance (LSPR) across the UV-VIS-NIR without sacrificing the linewidth as well as to achieve larger local field enhancement. Here, we report a simple and promising fabrication method of anisotropic gold nanostructures film using polystyrene-b-2vinylpyridine (PS-b-P2VP) block copolymers (BCP) as a template. In this approach, PS-b-P2VP spherical micelles were first synthesized as a template followed by selective deposition of Au precursor inside P2VP core of the micelles using ethanol solution of Au salt. Subsequently, heat treatment of the ...


Synthesis Of A Silsesquioxane Based Supramolecular Polymer, Rachel Bianculli 2018 Bowling Green State University

Synthesis Of A Silsesquioxane Based Supramolecular Polymer, Rachel Bianculli

Honors Projects

Research toward smart materials, specifically self-healing polymers, is an expanding topic within the materials science field. These materials rely heavily on dynamic crosslinking that is achieved by inducing different degrees of hydrogen bonding, van der Waals forces, etc. This work, demonstrated by research previously done within the Ostrowski research group, shows how coordination bonds of transition metals have been shown to create light activated, self-healing properties. Work done with these light-activated chromium (III) complexes with a poly(butylyene-co-ethylene) backbone have shown how metal—ligand coordination geometries can tune mechanical properties of the polymeric material. However, these materials suffer from being ...


Characterization Of Nylon-12 In A Novel Additive Manufacturing Technology, And The Rheological And Spectroscopic Analysis Of Peg-Starch Matrix Interactions, Garrett Michael Craft 2018 University of South Florida

Characterization Of Nylon-12 In A Novel Additive Manufacturing Technology, And The Rheological And Spectroscopic Analysis Of Peg-Starch Matrix Interactions, Garrett Michael Craft

Graduate Theses and Dissertations

In this work differential scanning calorimetry, dynamic mechanical analysis, Fourier-Transformed Infrared Spectroscopy [FT-IR] and polarized light microscopy will be employed to characterize polymeric systems. The first chapter broadly covers polymer synthesis and important characterization methods.

In the second chapter, a polyamide (PA12) will be sintered via a novel additive manufacturing (AM) technology developed here at USF termed LAPS (Large Area Projection Sintering). LAPS uses extended sintering timespans to ensure complete melting and densification of the polymer powder over the entire two-dimensional area of the part’s footprint. Further, it allows for the printed layer to crystallize and shrink in its ...


Digital Commons powered by bepress