Some Properties ofPoly(3-hydroxybutyrate)-Poly(3-hydroxyvalerate) Blends

✍ Scribed by Gassner, F.; Owen, A. J.

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 720 KB
• Volume: 39
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199603)39:3<215::aid-pi497>3.0.co;2-0

✦ Synopsis

The melting, crystallization and dynamic mechanical behaviour of blends of bacterially produced poly[~(-)-3-hydroxybutyrate] (PHB) and poly[~(-)-3-hydroxyvalerate] (PHV) have been investigated. Results showed that melt-pressed PHB-PHV blends contained phase-separated domains in the melt which subsequently crystallized as PHB and PHV type spherulites respectively. The two melting regions detected by DTA related to separate melting of PHB and PHV crystallites, which were almost unaffected by the blend composition. The mechanical behaviour of a random copolymer of PHB/HV was compared with that of a blend of almost the same composition, and found to be markedly different.