Study of PVC Plasticized by Octodecyl Acyl Tributyl Citrate

2011 ◽  
Vol 233-235 ◽  
pp. 2778-2784
Author(s):  
Jin Feng Cui ◽  
Jun Hong Guo ◽  
Yong Qiang Ma ◽  
Yan Hua Li ◽  
Cai Xia Qing ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Low Temperature ◽  
Thermal Behavior ◽  
Breaking Strength ◽  
Elongation At Break ◽  
Temperature Impact ◽  
Two Phases ◽  
Better Than

The PVC composite was prepared by extrusion melt using a new plasticizer octodecyl acyl tributyl citrate and PVC resin. Influence on mechanical and resistance to cold properties of PVC was studied by tensile and low temperature impact tests. The thermal behavior, texture and mechanism of plasticizing of OTBC plastifying PVC were supported by TG, DSC and SEM. The result indicated that the glass transition temperature of plastifying material was about 36°C, breaking strength was 25.3MPa, elongation at break was 250% and, plasicizing efficiency was 0.88, resistance to cold property better than plastifying material of DOP’s, domains between two phases of micro-texture were small and distributed homogeneously when OTBC content in PVC resin was 30%.

Citric acid grafting onto polyurethane for the control of molecular interactions and water compatibility

2016 ◽  
Vol 48 (8) ◽  
pp. 691-710
Author(s):  
Yong-Chan Chung ◽  
Hyeryoung Yoon ◽  
Jae Won Choi ◽  
Byoung Chul Chun
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Citric Acid ◽  
Low Temperature ◽  
Molecular Interactions ◽  
Water Permeability ◽  
Enthalpy Change ◽  
Low Temperature Flexibility ◽  
Grafting Onto

Citric acid (CA) was used as a grafted group onto polyurethane (PU) to form a CA-grafted PU series, with a control PU series containing free CA prepared for comparison. With an increase in the CA content, the enthalpy change during the melting increased for the PU and CPU series, and the glass transition temperature increased with the increase in CA content for the PU series but not for the CPU series. The tensile strengths of the PU series sharply increased with the CA content, whereas those of the CPU series did not. The PU series demonstrated better low-temperature flexibility and water permeability than the unmodified PU.

Cryomicroscopy of Latex and Latex Films

2000 ◽  
Vol 6 (S2) ◽  
pp. 316-317
Author(s):  
O. L. Shaffer ◽  
M. S. El-Aasser
Keyword(s):  
Electron Microscopy ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Low Temperature ◽  
Protective Coatings ◽  
Continuous Film ◽  
The Core ◽  
Film Forming ◽  
Water Uses

Latexes are dispersions of homopolymers and copolymers, usually in water. Uses of these latexes are many such as protective coatings and adhesives. In order to form a continuous film the polymer must have film forming properties such as a low glass transition temperature (Tg). Latexes are being designed such as one polymer in the core of the particle and a shell of another polymer or perhaps a series of shell layers. Microscopy has become a powerful tool in the examination of the morphology of the latex particles. Because of the use of low Tg polymers, sample preparation and examination by electron microscopy at temperatures above the Tg of the polymer causes the particles to become distorted and no longer representative of their true morphology. Low temperature methods therefore have become crucial in the field of latex microscopy.

Synthesis and properties of random polysulfone/polyethersulfone copolymers as high-performance polymers

2011 ◽  
Vol 31 (4) ◽  
Author(s):  
Yi-Nan Zhang ◽  
Shu-Ling Zhang ◽  
Yan-Hua Yang ◽  
Hong-Yi Qin ◽  
Dong Jiang
Keyword(s):  
Thermal Stability ◽  
Weight Loss ◽  
Tensile Strength ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
High Performance ◽  
Excellent Thermal Stability ◽  
Elongation At Break ◽  
High Performance Polymers

Abstract A series of random polysulfone/polyethersulfone (PSF/PES) copolymers were synthesized by the polycondensation of 4,4′-isopropylidenediphenol, 4,4′-dihydroxyldiphenylsulfone, and 4,4′-dichlorodiphenylsulfone in the presence of potassium carbonate. The resulting copolymers displayed similar solubility with PSF and PES. The glass transition temperature and the 5% weight loss temperature of these copolymers varied in the range of 199°C–299°C and 467°C–498°C, respectively, which showed excellent thermal stability. Moreover, the elongation at break of these copolymers was much higher than that of PES, whereas the tensile strength was a little lower.

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