Surface modification of ultra-high-molecular-weight polyethylene. II. Effect on the physicomechanical and tribological properties of ultra-high-molecular-weight polyethylene/poly(ethylene terephthalate) composites

2005 ◽  
Vol 99 (5) ◽  
pp. 2352-2358 ◽  
Author(s):  
Mostafa Rezaei ◽  
Azadeh Shirzad ◽  
Nadereh Golshan Ebrahimi ◽  
Marianna Kontopoulou
Keyword(s):  
Molecular Weight ◽  
Surface Modification ◽  
High Molecular Weight ◽  
Tribological Properties ◽  
Ethylene Terephthalate ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Ultra High Molecular Weight

Synthesis of Semi-Aromatic Copolyester with High Molecular Weight

2014 ◽  
Vol 598 ◽  
pp. 82-85 ◽  
Author(s):  
Jiang Wei Wang ◽  
Hua Jun Xu ◽  
Xiao Mei Bai ◽  
Fan Hong ◽  
Yan Ping Wang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Acetic Anhydride ◽  
High Molecular Weight ◽  
Ethylene Terephthalate ◽  
Repeat Unit ◽  
Insoluble Fraction ◽  
H Nmr ◽  
Poly Ethylene Terephthalate ◽  
Polymerization System ◽  
Poly Ethylene

The polymerization of para-acetoxybenzoic acid (PABA) and poly (ethylene terephthalate) to generate high molecular weight semi-aromatic copolyester was conducted successfully in the presence of acetic anhydride. The influence of acetic anhydride on the copolymerization was studied. The addition of acetic anhydride (2:1 mol AC2O /PET) in the polymerization system afforded the polymerized copolyester with an increased intrinsic viscosities (by 112.5%) and a decreased amount of insoluble fraction (by 80%). 1H-NMR analysis indicated that mole ratio of PET repeat unit and PHB was 42:58 with the addition of acetic anhydride, which was quite similar to the theoretical ratio and higher than traditional synthesized PET/PHB. The results show that the addition of acetic anhydride is effective not only in increasing the molecular weight but also in increasing benzene ring content in the copolyester.

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