Spherulitic Morphology and Radial Growth Kinetics of PHBV Grafted with PVP

摘要：

The spherulitic morphology and radial growth rate of poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) grafted with poly (N-vinylpyrrolidone) (PVP) were investigated by polarized optical microscopy (POM). All spherulites exhibit a typical black cross with a banded structure and absence of cracks: The band spacing decreased with decreasing isothermal crystallization temperature (T<,c>) for all samples. At the same T<,c>, the PVP groups decreased the spherulitic band spacing and radial growth rate (G) with increasing the graft ratio (GR％) of samples, indicating that the crystallization capability of grafted PHBV was weakened due to the steric hindrance of PVP side groups. Analysis of isothermal crystallization kinetics according to nucleation theories showed that both the surface free energy (σe) and the work of chain folding per molecular fold (q) of grafted PHBV increased with increasing GR％ of samples.

关键词： Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) Poly (N-vinylpyrrolidone) (PVP) Spherulitic morphology Spherulitic radial growth rate (G) Isothermal crystallization kinetics.

作者: WANg Wei ZHANG Yu CHEN Yanmo

作者单位: State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University,

会议类型: 国际会议

会议名称: 2007年先进纤维与聚合物国际会议

会议地点: 上海

会议语种:英文

页码: 705-708

在线出版日期: 2007-10-15（万方平台首次上网日期，不代表论文的发表时间）