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Full-Text Articles in Engineering
Cyclohexyl Thiols For Thiol-Ene Photopolymerization, Mark Soucek
Cyclohexyl Thiols For Thiol-Ene Photopolymerization, Mark Soucek
Mark D. Soucek
No abstract provided.
Mechanical And Film Properties Of Thermally Curable Polysiloxanes, Mark Soucek
Mechanical And Film Properties Of Thermally Curable Polysiloxanes, Mark Soucek
Mark D. Soucek
Telechelic glycidyl epoxide siloxanes substituted with either methyl, cyclopentyl, or cyclohexyl groups were cured thermally with corresponding telechelic aliphatic amine. Also, the three glycidyl epoxide functionalized siloxanes were homopolymerized via a photo-initiated cationic mechanism. Both the UV and thermal curing were performed by formulating with reactive diluents. The mechanical properties, viscoelastic behavior, and coatings properties of the thermally cured siloxanes were studied. In addition, the X-ray measurements were performed. The rate of polymerization increased with the increasing size of substituent on the siloxane backbone. The hardness, adhesion, and solvent resistance increased as the bulk of the substituent increased in the …
Uv-Curable Hybrid Coatings Based On Vinylfunctionalized Siloxane Oligomer And Acrylated Polyester, Mark Soucek
Uv-Curable Hybrid Coatings Based On Vinylfunctionalized Siloxane Oligomer And Acrylated Polyester, Mark Soucek
Mark D. Soucek
No abstract provided.
Tung Oil Reactive Diluents For Alkyd Systems: Film Properties, Mark Soucek
Tung Oil Reactive Diluents For Alkyd Systems: Film Properties, Mark Soucek
Mark D. Soucek
Reactive diluents were prepared from tung oil via a Diels–Alder reaction with three different dienophiles: methacryloxypropyl trimethoxysilane (TOMAS), 2,2,2-trifluoroethyl methacrylate (TOF) and triallyl ether acrylate (TOTAE). The reactive diluents were mixed with a long oil soya alkyd, a metal drier package, and a wetting agent; and then cured. Formulations were prepared as a function of reactive diluent type and wt%. Tensile, thermomechanical, and coatings properties were evaluated after curing the films. The addition of two reactive diluents, TOMAS and TOTAE, improved the tensile strength and tensile modulus of the alkyd. The addition of the diluents, however, did not significantly change …
Preparation Of A Thiol Siloxane Colliod For Uv-Curable Organic/Inorganic Films Based On Norbornene Linseed Oi, Mark Soucek
Preparation Of A Thiol Siloxane Colliod For Uv-Curable Organic/Inorganic Films Based On Norbornene Linseed Oi, Mark Soucek
Mark D. Soucek
No abstract provided.
Polyester/Poly(Meth)Acrylate Block Copolymers By Combined Polycondensation/Artp: Characterization And Properties, Mark Soucek
Polyester/Poly(Meth)Acrylate Block Copolymers By Combined Polycondensation/Artp: Characterization And Properties, Mark Soucek
Mark D. Soucek
No abstract provided.
Optimization Of Uv Curable Acrylated Polyester-Polyurethane/Polysiloxane Ceramer Coatings Using A Response Surface Methodogy, Mark Soucek
Mark D. Soucek
Dual UV and moisture curable acrylated polyester, organic/inorganic hybrid coatings were prepared using a coupling agent and tetraethylorthosilicate (TEOS) oligomers. An acrylated polyester resin based on adipic acid, neopentyl glycol, trimethylolpropane, and acrylic acid was synthesized. TEOS oligomers were prepared through the hydrolysis and condensation of TEOS with water and 3-(triethoxysilyl)propylisocyanate (TEOSPI) was used as the coupling agent between organic and inorganic phases. Trimethylolpropane triacrylate (TMPTA) was used as a reactive diluent. The formulations were cured into films by utilizing UV, followed by moisture curing. The resultant coatings were evaluated in terms of tensile and fracture toughness properties by using …
New Intramolecular Effect Observed For Polyesters: An Anomeric Effect, Mark Soucek
New Intramolecular Effect Observed For Polyesters: An Anomeric Effect, Mark Soucek
Mark D. Soucek
A series of polyesters was prepared to evaluate hydrolytic stability as a function of cyclohexyl dibasic acid content. The three cyclohexyl dibasic acids: 1,2; 1,3; and 1,4 were formulated into polyesters with two glycols. The proportion of cis and trans isomers was evaluated via 1H NMR. The hydrolytic stability of short chain polyesters was evaluated in an acetone/water mixture which solubilized the polyesters to mimic oligoester behavior within a thermosetting polyester coating environment. The rate of hydrolysis was monitored by acid titration and corroborated by GPC. Surprisingly, 1,2-cylohexyl diacid-based polyesters were robust, and 1,3-cyclohexyl diacid-based polyesters were the most susceptible …
Investigation Of Grafting Sites Of Acrylic Mixed Monomers Onto Unsaturated Fatty Acids: Part 2, Mark Soucek
Investigation Of Grafting Sites Of Acrylic Mixed Monomers Onto Unsaturated Fatty Acids: Part 2, Mark Soucek
Mark D. Soucek
Acrylic groups were grafted onto alkyds via free radical chemistry. The alkyd comprised soybean oil, glycerol, phthalic anhydride, and tetrahydrophthalic anhydride. To closely model acrylated-alkyds, a mixture of four acrylic monomers were copolymerized with the alkyd including: methyl methacrylate (MMA), butyl acrylate (BA), methacrylic acid (MAA), and vinyltrimethyoxysilane (VTMS). Two different initiator systems were used, benzoyl peroxide (BPO) and 2,2′-azobisisobutyronitrile (AIBN), for comparison. To elucidate the grafting sites, 1D NMR spectroscopy and 2D NMR spectroscopy were used. Gradient heteronuclear multiple quantum correlation (gHMQC) was needed to assign the chemical shifts of the 1D carbon and proton NMR spectra. The gHMQC …
Mechanical And Film Properties Of Telechelic Methacrylic Polysiloxane With Cycloaliphatic Substituents Groups For Uv-Curable Applications, Mark Soucek
Mark D. Soucek
Siloxanes with either methyl, cyclopentyl, or cyclohexyl groups were functionalized with methacrylate groups, then UV-cured using a free radical photo-initiator and a reactive diluent. Hexanediol dimethacrylate (0.1 wt%) was used as the reactive diluent. After curing, the mechanical, the viscoelastic, the coating, and the release properties of the cured films were studied. In addition, the oxygen permeability and the X-ray diffraction scans were evaluated. The crosslink density reduced with increase in siloxane substituent size. The oxygen permeability was dependent on crosslink density, and increased with increasing substituent size. The increase in permeability, and thus free volume, was supported by X-ray …
Inorganic/Organic Hybrid Coatings, Mark Soucek
Uv-Absorption Of Silica/Titania Colliods Using A Core-Shell Approach, Mark Soucek
Uv-Absorption Of Silica/Titania Colliods Using A Core-Shell Approach, Mark Soucek
Mark D. Soucek
Metal-oxo-colloids have been prepared using tetraethoxysilane (TEOS) oligomers with titanium tetra-i-propoxide (TIP) or titanium (di-i-propoxide) bis(acetylacetonate) (TIA) precursors. Transmission electron microscopy (TEM), FTIR, UV-Vis, and photoluminescence spectroscopy were used to investigate the composition, the size, and optical properties of the Si/Ti core–shell colloids. The presence of hetero-bonded silicate structure (Si–O–Ti) was indicated by FTIR spectroscopy. The size of Si/TIP system ranged from 55 to 120 nm and Si/TIA system ranged from 220 to 250 nm. The TEM data indicated that the size of colloids can be controlled by the TIP or TIA content. The Si/Ti system exhibited strong absorption in …