Thermal properties of blends comprising poly(3-hydroxybutyrate-co-3- hydroxyvalerate) and epoxidized natural rubber

• 出版年: Polymer Bulletin
• 第一著者: 2-s2.0-70449521208
• フォーマット: 論文
• 言語: English
• 出版事項: 2009
• オンライン･アクセス: https://www.scopus.com/inward/record.uri?eid=2-s2.0-70449521208&doi=10.1007%2fs00289-009-0108-1&partnerID=40&md5=f9bbdf2f4002ca9aa9e413f65caca3d9
• ISSN: 1700839
• DOI: 10.1007/s00289-009-0108-1

Blends of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) with 12 mol% hydroxyvalerate (HV) content and epoxidized natural rubber (ENR) with 50 mol% epoxidation level were studied along with the thermal properties and morphologies. Glass transition temperatures reveal immiscibility of the polymers over the entire composition range. The equilibrium melting point (T m 0) of PHBV in blends was determined applying Hoffman-Weeks step-wise annealing procedure. There is no significant variation of T m 0 for PHBV with blend composition. Also the crystallinity of PHBV stays approximately constant in the blends, only a slight decrease might be recognized with increasing ENR content. The rate of crystallization of PHBV decreases with PHBV content according to a power law. Morphological studies by polarizing optical microscopy reveal a fine intraspherulitic dispersion of ENR in volume-filling PHBV spherulites, which develop during isothermal crystallization. © 2009 Springer-Verlag.