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Full-Text Articles in Engineering
Design And Synthesis Of A New Mannitol Stearate Ester-Based Aluminum Alkoxide As A Novel Tri-Functional Additive For Poly(Vinyl Chloride) And Its Synergistic Effect With Zinc Stearate, Wenyuan Han, Manqi Zhang, Degang Li, Tianbao Dong, Bing Ai, Jianping Dou, Hongqi Sun
Design And Synthesis Of A New Mannitol Stearate Ester-Based Aluminum Alkoxide As A Novel Tri-Functional Additive For Poly(Vinyl Chloride) And Its Synergistic Effect With Zinc Stearate, Wenyuan Han, Manqi Zhang, Degang Li, Tianbao Dong, Bing Ai, Jianping Dou, Hongqi Sun
Research outputs 2014 to 2021
Thermal stabilizers, lubricant, and plasticizers are three crucial additives for processing poly(vinyl chloride) (PVC). In this study, a new mannitol stearate ester-based aluminum alkoxide (MSE-Al) was designed and synthesized as a novel additive for PVC. The thermal stability and processing performance of PVC stabilized by MSE-Al were evaluated by the Congo red test, conductivity measurement, thermal aging test, ultravioletevisible (UV–Vis) spectroscopy test, and torque rheometer test. Results showed that the addition of MSE-Al could not only markedly improve the long-term thermal stability of PVC, but also greatly accelerate the plasticizing and decrease the balance torque, which demonstrated that MSE-Al possessed …
Facile Synthesis Of Di-Mannitol Adipate Ester-Based Zinc Metal Alkoxide As A Bi-Functional Additive For Poly(Vinyl Chloride), Yuepeng Li, Degang Li, Wenyuan Han, Manqi Zhang, Bing Ai, Lipeng Zhang, Hongqi Sun, Zhen Cui
Facile Synthesis Of Di-Mannitol Adipate Ester-Based Zinc Metal Alkoxide As A Bi-Functional Additive For Poly(Vinyl Chloride), Yuepeng Li, Degang Li, Wenyuan Han, Manqi Zhang, Bing Ai, Lipeng Zhang, Hongqi Sun, Zhen Cui
Research outputs 2014 to 2021
A new di-mannitol adipate ester-based zinc metal alkoxide (DMAE-Zn) was synthesized as a bi-functional poly(vinyl chloride) (PVC) thermal stabilizer for the first time. The materials were characterized with Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). Characterization results confirmed the formation of Zn–O bonds in DMAE-Zn, and confirmed that DMAE-Zn had a high decomposition temperature and a low melting point. The thermal stability of DMAE-Zn on PVC also was tested by a conductivity test, a thermal aging test, and a UV-visible spectroscopy (UV-VIS) test. PVC stabilized by DMAE-Zn had a good initial color and excellent long-term stability. UV-VIS also …
Effect Of Pretreatment Process On Scale Formation In The Re-Boiler Section Of Monoethylene Glycol Regeneration Plant, Ammar Al Helal, Adam Soames, Stefan Iglauer, Ahmed Barifcani, Rolf Gubner
Effect Of Pretreatment Process On Scale Formation In The Re-Boiler Section Of Monoethylene Glycol Regeneration Plant, Ammar Al Helal, Adam Soames, Stefan Iglauer, Ahmed Barifcani, Rolf Gubner
Research outputs 2014 to 2021
Monoethylene glycol (MEG) regeneration plants often use pretreatment vessels to precipitate divalent cations, such as Fe2+, Ca2+, and Mg2+, in order to avoid or reduce fouling in downstream reboilers and heat exchangers. This pretreatment process operates under alkaline conditions and moderate temperatures (~ 80 °C) to accelerate the formation of low-solubility divalent salts. The objective of the present research was to determine whether the pretreatment process could be minimized, without negatively impacts on the MEG regeneration process from to the formation of scale on the heater bundle in the presence of low concentrations of …
Impact Of Secondary Reactive Species On The Apparent Decoupling Of Poly(Ethylene Glycol) Diacrylate Hydrogel Average Mesh Size And Modulus, Dany J. Munoz Pinto, S. Samavedi, B. Grigoryan, M. S. Hahn
Impact Of Secondary Reactive Species On The Apparent Decoupling Of Poly(Ethylene Glycol) Diacrylate Hydrogel Average Mesh Size And Modulus, Dany J. Munoz Pinto, S. Samavedi, B. Grigoryan, M. S. Hahn
Engineering Faculty Research
Poly(ethylene glycol) diacrylate (PEGDA) hydrogels are widely used in biotechnology due to their in situ crosslinking capacity and tunable physical properties. However, as with all single component hydrogels, the modulus of PEGDA networks cannot be tailored independently of mesh size. This interdependence places significant limitations on their use for defined, 3D cell-microenvironment studies and for certain controlled release applications. The incorporation of secondary reactive species (SRS) into PEGDA hydrogels has previously been shown to allow the identification of up to 6 PEGDA hydrogel formulations for which distinct moduli can be obtained at consistent average mesh size (or vice versa). However, …
Characterization Of Sequential Collagen-Poly(Ethylene Glycol) Diacrylate Interpenetrating Networks And Initial Assessment Of Their Potential For Vascular Tissue Engineering, Dany J. Munoz Pinto, Andrea C. Jimenez-Vergara, T. P. Gharat, M. S. Hahn
Characterization Of Sequential Collagen-Poly(Ethylene Glycol) Diacrylate Interpenetrating Networks And Initial Assessment Of Their Potential For Vascular Tissue Engineering, Dany J. Munoz Pinto, Andrea C. Jimenez-Vergara, T. P. Gharat, M. S. Hahn
Engineering Faculty Research
Collagen hydrogels have been widely investigated as scaffolds for vascular tissue engineering due in part to the capacity of collagen to promote robust cell adhesion and elongation. However, collagen hydrogels display relatively low stiffness and strength, are thrombogenic, and are highly susceptible to cell-mediated contraction. In the current work, we develop and characterize a sequentially-formed interpenetrating network (IPN) that retains the benefits of collagen, but which displays enhanced mechanical stiffness and strength, improved thromboresistance, high physical stability and resistance to contraction. In this strategy, we first form a collagen hydrogel, infuse this hydrogel with poly(ethylene glycol) diacrylate (PEGDA), and subsequently …
Enhanced Boron Rejection By Nf/Ro Membranes By Complexation With Polyols: Measurement And Mechanisms, Kha L. Tu, Allan R. Chivas, Long D. Nghiem
Enhanced Boron Rejection By Nf/Ro Membranes By Complexation With Polyols: Measurement And Mechanisms, Kha L. Tu, Allan R. Chivas, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
Boron rejection by nanofiltration (NF) and reverse osmosis (RO) membranes in the presence of glycerol, mannitol and sorbitol was investigated as a function of feed solution pH and boron:polyol molar ratio. In the presence of polyols, significant boron rejection improvement was obtained and the extent of the impact was directly related to the stability constant of the boron-polyol complex. Polyols could complex with boron in either the boric acid or borate anion forms; however the complexation between polyol and boric acid appeared to be incomplete. With and without the presence of polyols, boron rejection was strongly pH dependent. The increase …