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Nonisothermal crystallization and melting behavior of poly(β-hydroxybutyrate)–Poly(vinyl-acetate) blends

✍ Scribed by Yuxian An; Lixia Li; Lisong Dong; Zhishen Mo; Zhiliu Feng

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
200 KB
Volume
37
Category
Article
ISSN
0887-6266

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✦ Synopsis

Nonisothermal crystallization and melting behavior of poly(␤-hydroxybutyrate) (PHB)-poly(vinyl acetate) (PVAc) blends from the melt were investigated by differential scanning calorimetry using various cooling rates. The results show that crystallization of PHB from the melt in the PHB-PVAc blends depends greatly upon cooling rates and blend compositions. For a given composition, the crystallization process begins at higher temperatures when slower scanning rates are used. At a given cooling rate, the presence of PVAc reduces the overall PHB crystallization rate. The Avrami analysis modified by Jeziorny and a new method were used to describe the nonisothermal crystallization process of PHB-PVAc blends very well. The doublemelting phenomenon is found to be caused by crystallization during heating in DSC.

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