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Hydrophilic thermotropic block copolyetheresters with poly(pentamethylene p , p ′‐bibenzoate) segments
Author(s) -
Hsiue LinTee,
Ma ChenChi M.,
Tsai HongBing
Publication year - 1995
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1995.021961103
Subject(s) - thermotropic crystal , ethylene oxide , differential scanning calorimetry , ethylene glycol , polymer chemistry , absorption of water , peg ratio , condensation polymer , absorption (acoustics) , chemistry , materials science , copolymer , phase (matter) , polymer , organic chemistry , liquid crystalline , physics , finance , economics , composite material , thermodynamics
Block copolyetheresters 1 with poly(pentamethylene p , p ′‐bibenzoate) segments and poly(ethylene oxide) segments were prepared by melt polycondensation of dimethyl p , p ′‐bibenzoate, 1,5‐pentanediol, and poly(ethylene glycol) (PEG) with molecular weights of 400, 1 000, or 2 000. The 1 H NMR analysis shows that the feed mole ratio of PEG to dimethyl p , p ′‐bibenzoate determines the composition of the block copolyetheresters. The differential scanning calorimetry (DSC) results indicate that some block copolyetheresters exhibit a monotropic smectic liquid‐crystalline phase due to the poly(pentamethylene p , p ′‐bibenzoate) segments. The transitions depend on the content and the molecular weight of the PEG. The block copolyetheresters 1 show high water absorption due to the hydrophilic nature of the poly(ethylene oxide) segments. The water absorption increases with increasing PEG content. As the molecular weight of PEG increases, the water absorption increases significantly.