Effect of nucleating agents on the crystallization of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)
Effect of nucleating agents on the crystallization of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)
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DOI：
10.1002/app.11023
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发表时间：
2002-11-28
影响因子：
3
通讯作者：
Liu, JJ
中科院分区：
文献类型：
--
作者：
Liu, WJ;Yang, HL;Liu, JJ
研究了成核剂对聚（3-羟基丁酸酯-co-3-羟基戊酸酯）（PHBV）结晶行为的影响。采用差示扫描量热仪从熔体和熔融行为中监测结晶过程的能量。在结晶过程中，成核剂的加入使PHBV的结晶温度（Tc）较未加入成核剂的PHBV有所提高。成核剂的加入对PHBV的熔融温度影响不大。但成核剂的加入使两个熔融峰的面积发生了较大的变化。在等温结晶过程中，相对结晶度与时间的依赖关系由Avrami方程描述。成核剂的加入提高了PHBV的结晶速率，但不影响PHBV晶体的成核和生长机制。测定了PHBV的平衡熔点为187 ℃。根据成核理论的动力学数据的分析表明，在复合材料中的PHBV的结晶速率的增加是由于末端表面的表面能的降低。(C)2002 Wiley Periodicals，Inc.
The effect of nucleating agents on the crystallization behavior of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) was studied. A differential scanning calorimeter was used to monitor the energy of the crystallization process from the melt and melting behavior. During the crystallization process from the melt, nucleating agent led to an increase in crystallization temperature (T-c) of PHBV compared with that for plain PHBV (without nucleating agent). The melting temperature of PHBV changed little with addition of nucleating agent. However, the areas of two melting peaks changed considerably with added nucleating agent. During isothermal crystallization, dependence of the relative degree of crystallization on time was described by the Avrami equation. The addition of nucleating agent caused an increase in the overall crystallization rate of PHBV, but did not influence the mechanism of nucleation and growth of the PHB crystals. The equilibrium melting temperature of PHBV was determined as 187degreesC. Analysis of kinetic data according to nucleation theories showed that the increase in crystallization rate of PHBV in the composite is due to the decrease in surface energy of the extremity surface. (C) 2002 Wiley Periodicals, Inc.