Hydrophilic thermotropic block copolyetheresters with poly(pentamethylene p,p′-bibenzoate) segments

✍ Scribed by Lin-Tee Hsiue; Chen-Chi M. Ma; Hong-Bing Tsai

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 488 KB
• Volume: 196
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1995.021961103

✦ Synopsis

Abstract

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.