Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 111, Issue 2, Pages 1243-1250Publisher
SPRINGER
DOI: 10.1007/s10973-012-2503-3
Keywords
Low molecular weight polyhydroxybutyrate; Polyhydroxybutyrate; Biodegradation; Crystallization; Tensile property; Plasticization
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The properties of the low molecular weight polyhydroxybutyrate (LMWPHB) and LMWPHB plasticized polyhydroxybutyrate (PHB) are studied using differential scanning calorimetry (DSC), thermogravimetric analysis, wide-angle X-ray diffraction (WAXD), polarized optical microscope (POM), mechanical, and biodegradation tests. The results of DSC, WAXD, and POM indicate that LMWPHB has a lower glass transition temperature (T (g)), crystallinity, crystallization rate, melting temperature (T (m)), and crystal size than PHB due to its much smaller molecular weight. The tensile strength, T (g), T (m), crystallinity, crystallization rate, and thermal stability of LMWPHB plasticized PHB decrease, while the flexibility and biodegradation rate increase with the increasing content of the added LMWPHB. It is confirmed that LMWPHB can be used to improve the brittleness and control the biodegradation rate of PHB.
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