Isothermal crystallization kinetics of modified bamboo cellulose/PCL composites
Isothermal crystallization kinetics of modified bamboo cellulose/PCL composites
复制标题
改性竹纤维素/PCL复合材料的等温结晶动力学
DOI：
10.1016/j.carbpol.2009.08.037
复制
发表时间：
2010-02-11
影响因子：
11.2
通讯作者：
Xiong, Hanguo
中科院分区：
文献类型：
--
作者：
Liu, Huaxi;Huang, Yuanyuan;Xiong, Hanguo
为了更好地利用竹纤维并为其提供理论依据，采用差示扫描量热法(DSC)研究了改性竹纤维/聚己内酯(MBC/PCL)复合材料在不同结晶温度(T-c)下的等温结晶动力学。用Avrami模型描述了等温结晶过程。根据Hoffman-Week理论，复合材料的平衡熔点(T-m(0))随MBC含量的增加而增大。MBC的存在显著影响了PCL/MBC复合材料的球晶生长速率、总结晶速率、活化能和折叠表面自由能(σ(E))。根据Avrami理论，MBC促进了PCL在复合材料中的结晶。然而，与纯PCL相比，PCL/MBC复合材料具有更高的sigma(E)值。这表明，由于MBC的存在，球间区域中PCL链的迁移率存在限制。(C)2009爱思唯尔有限公司。保留所有权利。
For the purpose of utilizing bamboo cellulose and providing a theoretical basis, the isothermal crystallization kinetics of modified bamboo cellulose/poly(epsilon-caprolactone) (MBC/PCL) composites has been investigated by differential scanning calorimetry (DSC) at different crystallization temperature (T-c). The Avrami model was applied to describe the process of isothermal crystallization. According to Hoffman-Weeks theory, the values of the equilibrium melting point (T-m(0)) increased with an increase in the content of MBC in the composites. The spherulite growth rate, the overall crystallization rate, the activation energy and folding-surface free energy (sigma(e)) of PCL/MBC composites are markedly affected by the presence of MBC. According to Avrami theory, MBC accelerates the crystallization of PCL in the composites. However, as compared to neat PCL, all the composites of PCL/MBC had the higher sigma(e) value. This indicates that there exist constraints on the mobility of the PCL chains in the interspherulitic regions due to the presence of MBC. (C) 2009 Elsevier Ltd. All rights reserved.