STUDIES ON LIQUID CRYSTALLINE COPOLYESTERS OF p -HYDROXYBENZOIC ACID AND POLY(ETHYLENE TEREPHTHALATE)
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STUDIES ON LIQUID CRYSTALLINE COPOLYESTERS OF p -HYDROXYBENZOIC ACID AND POLY(ETHYLENE TEREPHTHALATE)
Acta Polymerica SinicaIssue 1, Pages: 77-81(1996)
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Published:20 February 1996,
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ZHANG Guangli, YAN Fengqi, LI Yong, WANG Zhen, PAN Jingqi, ZHANG Hongzhi. STUDIES ON LIQUID CRYSTALLINE COPOLYESTERS OF p -HYDROXYBENZOIC ACID AND POLY(ETHYLENE TEREPHTHALATE). [J]. Acta Polymerica Sinica (1):77-81(1996)
DOI:
ZHANG Guangli, YAN Fengqi, LI Yong, WANG Zhen, PAN Jingqi, ZHANG Hongzhi. STUDIES ON LIQUID CRYSTALLINE COPOLYESTERS OF p -HYDROXYBENZOIC ACID AND POLY(ETHYLENE TEREPHTHALATE). [J]. Acta Polymerica Sinica (1):77-81(1996)DOI:
STUDIES ON LIQUID CRYSTALLINE COPOLYESTERS OF p -HYDROXYBENZOIC ACID AND POLY(ETHYLENE TEREPHTHALATE)
iquid Crystalline copolyesters containing poly(ethylene terephthalate)(PET) and high proportion of p-hydroxybenzoic acid(PHB) moieties up to 80 mol%
were prepared by conventional(one-step)and two-step polycondenstion processes and the products were studied by visual observation under polarizing microscope thermomechanical analysis and 1H-NMR spectroscopy . The copolyester prepared by one-step process has a blockmicrostructure
as verified by 1H-NMR study.Whereas a more random copolyester with an obviously decreased amount of insoluble fraction was obtained by two-step process.Their soluble fractions have a random sequence distribution and could be dissolved in P-chlorophenol and tetrachloroethane solvent mixture even if the PHB moiety content is as high as 80 mol%.
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