Multistructural Network Design Enables Polybenzoxazine to Achieve Low-Loss-Grade Super-High-Frequency Dielectric Properties and High Glass Transition Temperatures

2021 ◽  
Author(s):  
Ming Zeng ◽  
Dengru Tan ◽  
Zijian Feng ◽  
Jiangbing Chen ◽  
Xiang Lu ◽  
...  
Keyword(s):  
Glass Transition ◽  
Dielectric Properties ◽  
Network Design ◽  
High Frequency ◽  
Transition Temperatures ◽  
Low Loss ◽  
Glass Transition Temperatures ◽  
Super High Frequency

Effect of iron particles on dielectric properties of polydimethylsiloxane near crystallization and glass transition temperatures

2006 ◽  
Vol 48 (5) ◽  
pp. 267-270 ◽  
Author(s):  
A. M. Lotonov ◽  
N. D. Gavrilova ◽  
E. Yu. Kramarenko ◽  
E. I. Alekseeva ◽  
P. Yu. Popov ◽  
...  
Keyword(s):  
Glass Transition ◽  
Dielectric Properties ◽  
Transition Temperatures ◽  
Iron Particles ◽  
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.

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