Isothermal crystallization of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)
Peng, SW; An, YX; Chen, C; Fei, B; Zhuang, YG; Dong, LS
AbstractIsothermal crystallization behavior of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) was investigated by means of differential scanning calorimetry and polarized optical microscopy (POM). The Avrami analysis can be used successfully to describe the isothermal crystallization kinetics of PHBV, which indicates that the Avrami exponent n = 3 is good for all the temperatures investigated. The spherulitic growth rate, G, was determined by POM. The result shows that the G has a maximum value at about 353 K. Using the equilibrium melting temperature (448 K) determined by the Flory equation for melting point depression together with U-* = 1500 cal mol(-1), T-infinity = 30 K and T-g = 278 K, the nucleation parameter K-g was determined, which was found to be 3.14+/-0.07 x 10(5) (K-2), lower than that for pure PHB. The surface-free energy sigma = 2.55 x 10(-2) J m(-2) and sigma(e) = 2.70+/-0.06 x 10-2 J m(-2) were estimated and the work of chain-folding (q = 12.5+/-0.2 kJ mol(-1)) was derived from sigma(e), and found to be lower than that for PHB. This implies that the chains of PHBV are more flexible than that of PHB. (C) 2003 Elsevier Science Ltd. All rights reserved.
KeywordIsothermal Crystallization Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Kinetics
Indexed BySCI
WOS IDWOS:000183680900022
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Cited Times:49[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorDong, LS
AffiliationChinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Peng, SW,An, YX,Chen, C,et al. Isothermal crystallization of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)[J]. EUROPEAN POLYMER JOURNAL,2003,39(7):1475-1480.
APA Peng, SW,An, YX,Chen, C,Fei, B,Zhuang, YG,&Dong, LS.(2003).Isothermal crystallization of poly(3-hydroxybutyrate-co-3-hydroxyvalerate).EUROPEAN POLYMER JOURNAL,39(7),1475-1480.
MLA Peng, SW,et al."Isothermal crystallization of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)".EUROPEAN POLYMER JOURNAL 39.7(2003):1475-1480.
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