Poly(ethylene glycol-co-1,4-cyclohexanedimethanol terephthalate) random copolymers: effect of copolymer composition and microstructure on the thermal properties and crystallization behavior

RSC Advances ◽  
2015 ◽  
Vol 5 (74) ◽  
pp. 60570-60580 ◽  
Author(s):  
Tingting Chen ◽  
Guodong Jiang ◽  
Guoyu Li ◽  
Zhipeng Wu ◽  
Jun Zhang
Keyword(s):  
Glass Transition ◽  
Thermal Properties ◽  
Crystallization Behavior ◽  
Random Copolymers ◽  
Sequence Length ◽  
Copolymer Composition ◽  
Poly Ethylene Glycol ◽  
Average Sequence Length ◽  
Average Sequence ◽  
Poly Ethylene

The glass transition temperature of the statistically random PETG copolymers increased linearly with the increasing CT content. An increase in the average sequence length resulted in a higher melting temperature.

Relationship between Sequence Length and Thermal Properties of Poly(ethylene Terephthalate-Co-4, 4’-Bibenzoate) (PETBB)

2012 ◽  
Vol 476-478 ◽  
pp. 2243-2247
Author(s):  
Jian Ming Jiang ◽  
Jun Ming Dai ◽  
Sheng Lin Yang ◽  
Guang Li
Keyword(s):  
Chemical Composition ◽  
Melting Temperature ◽  
Ethylene Terephthalate ◽  
Feed Ratio ◽  
Sequence Length ◽  
Poly Ethylene Terephthalate ◽  
Average Sequence Length ◽  
Average Sequence ◽  
Poly Ethylene ◽  
High Level

Poly(ethylene terephthalate-co-4,4’-bibenzoate)s (PETBBs) with 0-25mol% bibenzoate unit were prepared from terephthalic acid (PTA), 4,4'- bibenzoic acid (BBA) and ethylene glycol (EG). The chemical composition and number-average sequence length of the resultant PETBBs were investigated by 13C-NMR. It was improved that the chemical composition of PETBBs is identical with the feed ratio, and the number-average sequence length of PET segment (LPET) becomes reduced with increasing BBA unit. The molecular weights of PETBBs reaches the high level for practical use. DSC analysis explains that the glass transition temperature (Tg) increases almost linearly and the crystallization becomes difficulty with increasing content of BBA unit. X-ray diffraction also illustrates that both crystallinity and crystal size reduced as more BBA unit is incorporated. Moreover, the relationship between the number-average sequence length and the melting temperature was investigated. The linear correlation between the number-average sequence length (LPET) and the melting temperature was observed.

Photodegradation behavior and mechanism of poly(ethylene glycol-co-1,4-cyclohexanedimethanol terephthalate) (PETG) random copolymers: correlation with copolymer composition

RSC Advances ◽  
2016 ◽  
Vol 6 (104) ◽  
pp. 102778-102790 ◽  
Author(s):  
Tingting Chen ◽  
Jun Zhang ◽  
Hongjun You
Keyword(s):  
Ethylene Glycol ◽  
Random Copolymers ◽  
Copolymer Composition ◽  
Type I ◽  
Poly Ethylene Glycol ◽  
Crosslinking Degree ◽  
Norrish Type ◽  
Poly Ethylene

Norrish type I and II mechanisms occurred in PETG copolymers. The inherent photostability of PETG decreased with increasing CHDM content. The higher CHDM content resulted in the higher crosslinking degree.

scholarly journals Synthesis and Thermal Properties of Poly(ethylene glycol)-polydimetylsiloxane Crosslinked Copolymers

2018 ◽  
Vol 47 (6) ◽  
pp. 1117-1122
Author(s):  
Ain Athirah Zainuddin ◽  
Rizafizah Othaman ◽  
Wan Syaidatul Aqma Wan Mohd Noor, ◽  
Takeno Akiyoshi ◽  
Takahashi Shinya ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Ethylene Glycol ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene
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