Multiple melting behaviour of poly(3-hydroxybutyrate-co-hydroxyvalerate) using step-scan DSC

被引:143
作者
Gunaratne, LMWK [1 ]
Shanks, RA [1 ]
机构
[1] RMIT Univ, Sch Appl Sci, Melbourne, Vic 3001, Australia
关键词
poly(hydroxybutyrate-co-hydroxyvalerate); step-scan DSC; isothermal crystallisation; wide angle X-ray diffraction; morphology;
D O I
10.1016/j.eurpolymj.2005.06.015
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Melting behaviour and crystal morphology of poly(3-hydroxybutyrate) (PHB) and its copolymer of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) with various hydroxyvalerate (HV) contents [5 wt.% (PHB5V), 8 wt.% (PHB8V) and 12 wt.% (PHB12V)] have been investigated by conventional DSC, step-scan differential scanning calorimetry (SDSC), wide angle X-ray diffraction (WAXRD) and hot stage polarised optical microscopy (HSPOM). Crystallisation behaviour of PHB and its copolymers were investigated by isothermal crystallisation kinetics. Thermal properties were investigated after isothermal crystallisation treatment. Multiple melting peak behaviour was observed for all polymers. SDSC data revealed that PHB and its copolymers undergo melting-recrystallisation-remelting during heating, as evidenced by exothermic peaks in the lsoK baseline (C-p,C-IsoK,C- non-reversing signal). An increase in degree of crystallinity due to significant melt-recrystallisation was observed for isothermally crystallised polymers. SDSC proved a convenient and precise method for measurement of the apparent thermodynamic specific heat (C-p,C-ATD, reversing signal). PHB and PHBV showed different crystal morphologies for similar crystallisation condition. HSPOM results showed that the crystallisation rates reduced and sizes of spherulites were significantly increased as HV content increased. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2980 / 2988
页数:9
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