Isothermal crystallization kinetics of modified bamboo cellulose/PCL composites

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• 作者：Huaxi Liu ; Yuanyuan Huang ; Liang Yuan ; Pingsheng He ; Zhonghua Cai ; Yiliang Shen ; Youming Xu ; Yan Yu ; Hanguo Xiong
• 关键词：Bamboo cellulose ; PCL ; Isothermal crystallization kinetics ; DSC
• 刊名：Carbohydrate Polymers
• 出版年：2010
• 出版时间：11 February 2010
• 年：2010
• 卷：79
• 期：3
• 页码：513-519
• 全文大小：735 K

文摘

For the purpose of utilizing bamboo cellulose and providing a theoretical basis, the isothermal crystallization kinetics of modified bamboo cellulose/poly(ε-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 () 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 (σ_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 σ_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.