scholarly journals Depression of glass transition temperatures of polymer networks by diluents

1983 ◽  
Vol 16 (2) ◽  
pp. 244-249 ◽  
Author(s):  
Genit ten Brinke ◽  
Frank E. Karasz ◽  
T. S. Ellis
Keyword(s):  
Glass Transition ◽  
Polymer Networks ◽  
Transition Temperatures ◽  
Glass Transition Temperatures

Free Recovery Effects of Shape-Memory Polymers for Cardiovascular Stents

2005 ◽  
Vol 898 ◽  
Author(s):  
Christopher Michael Yakacki ◽  
Robin Shandas ◽  
Craig Lanning ◽  
Ken Gall
Keyword(s):  
Glass Transition ◽  
Shape Memory ◽  
Polymer Networks ◽  
Transition Temperatures ◽  
Poly Ethylene Glycol ◽  
Glass Transition Temperatures ◽  
Cardiovascular Stents ◽  
Geometrical Features ◽  
Poly Ethylene ◽  
Free Strain

AbstractThe shape-memory effect was examined in polymer stents intended for cardiovascular applications. Four polymer networks were synthesized from poly(ethylene glycol) dimethacrylate and tert-butyl acrylate with 10 wt% and 20 wt% crosslinker, and with glass transition temperatures (Tg) of 52°C and 55°C. Solid and 50% porous stents were manufactured and tested for free strain recoverability at temperatures at or just above 37°C. Stents with lower glass transition temperatures and a higher degree of crosslinking recovered faster than their counterparts. Lower deformation (packaging) temperatures and higher recovery temperatures induce more rapid recovery. The presence of geometrical features, such as pores, initiated recovery sooner, but had negligible influence on overall recovery.

Glass transition temperatures and Charge Transport Characteristics of Epoxy/SiO2 Composites

2020 ◽  
Author(s):  
Xiangnan Hu ◽  
Zhaoliang Xing ◽  
Shihang Wang ◽  
Jiucheng Wang ◽  
Jiao Xiang ◽  
...  
Keyword(s):  
Glass Transition ◽  
Charge Transport ◽  
Transition Temperatures ◽  
Glass Transition Temperatures

Properties of Random PSF/PES Copolymers as High-Performance Polymers

2011 ◽  
Vol 217-218 ◽  
pp. 1606-1610
Author(s):  
Dong Jiang ◽  
Xiao Ran Zhang ◽  
Yan Mei Ma ◽  
Cheng You Ma
Keyword(s):  
Weight Loss ◽  
Tensile Strength ◽  
Glass Transition ◽  
High Performance ◽  
Molar Ratio ◽  
Transition Temperatures ◽  
Elongation At Break ◽  
Glass Transition Temperatures ◽  
High Performance Polymers ◽  
Diphenyl Sulfone

A series of random polysulfone/polyethersulfone (PSF/PES) copolymers were synthesized by the polycondensation of 4, 4'-isopropylidendiphenol, 4, 4΄-dihyolroxy diphenyl sulfone and 4, 4'-dichlorodiphenyl sulfone in the presence of K2CO3. We obtained a series of copolymers by changing the molar ratio of 4, 4΄-dihyolroxy diphenyl sulfone and 4, 4'-isopropylidendiphenol (it was marked as the ratio of S:A). The copolymers have the similar solubility with polyethersulfone. They also have high glass transition temperatures (Tg: 199°C~229°C) and 5% weight loss temperatures (4, 4'-isopropylidendiphenol: 4, 4΄-dihyolroxy diphenyl sulfone=1:1, Td5=497°C). At the same time the elongation at break is much higher than that of PES, while the tensile strength is a little lower than that of PES.

Prediction of glass transition temperatures of polyquinolines and polyquinoxalines

2012 ◽  
Vol 54 (1) ◽  
pp. 48-60 ◽  
Author(s):  
Yanli Liu ◽  
Zhengde Tan ◽  
Shihua Zhang
Keyword(s):  
Glass Transition ◽  
Transition Temperatures ◽  
Glass Transition Temperatures
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