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Compatibility and fungal degradation of poly[(R)-3-hydroxybutyrate]/aliphatic copolyester blend

✍ Scribed by Jin-San Yoon; Min-Chul Chang; Mal-Nam Kim; Eun-Jung Kang; Chulhee Kim; In-Joo Chin

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 465 KB
Volume: 34
Category: Article
ISSN: 0887-6266
DOI: 10.1002/(sici)1099-0488(19961115)34:15<2543::aid-polb2>3.0.co;2-u

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✦ Synopsis

Poly[ (R)-3-hydroxybutyrate] (PHB) was blended with an aliphatic copolyester, which was synthesized by the esterification of adipic acid, ethylene glycol, and lactic acid. The blend showed a single Tg, which varied systematically but convexly upwards with the composition.

The growth rate of PHB spherulites, the crystallization temperature, and the equilibrium melting temperature of the blend were decreased as the amount of the copolyester was increased. Therefore, the blend system was determined to be compatible. However, the degree of crystallinity, and the enthalpies of crystallization and fusion of P H B in the blend remained almost constant, regardless of the compositional change, although the crystallization rate was decreased upon blending. No chemical change such as transesterification was observed as a result of the blending, yet there was a slight change in the crystalline morphology of PHB. The rate of fungal degradation was lowered with an increase in the copolyester content of the blend.

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