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- W2006479265 abstract "Liquid crystalline copolyester of 3-(4-hydroxyphenyl)propionic acid (HPPA) of natural origin with 4-hydroxybenzoic acid (HBA) was synthesized by direct acidolytic polycondensation of the pure acetoxy derivatives of the monomers. The copolyesters were characterized by IR and NMR spectroscopy and by viscosity, TGA, DSC and PLM measurement. The HPPA/HBA50:50 copolyester showed birefringence with nematic schlieren texture above 220°C with melt processability. The in vitro hydrolytic degradability of the polyesters was studied by noting water absorption in buffer solutions of pH 7 and 10 at 30 and 60°C. The degradation observed at 30°C and pH 7 was 0.7 wt%, in the case of HPPA/HBA50:50 copolyester after 340 hours. At pH 10 and at 60°C, the degradation reached 2.75 wt% after 340 hours. The degradation was also proven by DSC, TGA, WAXD, and SEM techniques. The results indicated considerable degradation compared to commercial Vectra®." @default.
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- W2006479265 date "2001-06-30" @default.
- W2006479265 modified "2023-10-16" @default.
- W2006479265 title "BIODEGRADABLE LIQUID CRYSTALLINE POLYESTERS OF HYDROXYPHENYLALKANOIC ACIDS: SYNTHESIS AND IN VITRO DEGRADATION STUDIES OF POLY[3-(4-OXYPHENYL)-PROPIONATE-CO-4-OXYBENZOATE]" @default.
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- W2006479265 doi "https://doi.org/10.1081/ma-100103870" @default.
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