Zhao Yuanyuan, Qiu Zhaobin
State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China.
J Nanosci Nanotechnol. 2012 May;12(5):4067-74. doi: 10.1166/jnn.2012.5876.
The effect of low carboxyl-functionalized multi-walled carbon nanotubes (f-MWCNTs) loading on the crystallization behavior of biodegradable poly(butylene adipate) (PBA) was studied with various techniques in this work. For the nonisothermal melt crystallization, f-MWCNTs accelerate the crystallization process of PBA apparently due to the heterogeneous nucleation effect. The Ozawa method fails to describe the nonisothermal crystallization process of neat PBA and its nanocomposite. Isothermal melt crystallization kinetics of neat PBA and its nanocomposite was analyzed by the Avrami equation. The overall isothermal crystallization rate of neat PBA and its nanocomposite increases with increasing crystallization temperature. The addition of f-MWCNTs accelerates the isothermal crystallization of PBA as compared with that of neat PBA at a given crystallization temperature, indicative of the nucleating agent effect of f-MWCNTs; however, the crystallization mechanism does not change. The crystal structure of PBA remains unchanged in the PBA/f-MWCNTs nanocomposite despite the presence of f-MWCNTs.
本工作采用多种技术研究了低羧基官能化多壁碳纳米管（f-MWCNTs）负载量对可生物降解聚己二酸丁二醇酯（PBA）结晶行为的影响。对于非等温熔体结晶，由于异相成核作用，f-MWCNTs明显加速了PBA的结晶过程。小泽方法无法描述纯PBA及其纳米复合材料的非等温结晶过程。通过阿弗拉米方程分析了纯PBA及其纳米复合材料的等温熔体结晶动力学。纯PBA及其纳米复合材料的整体等温结晶速率随结晶温度的升高而增加。在给定的结晶温度下，与纯PBA相比，f-MWCNTs的加入加速了PBA的等温结晶，表明f-MWCNTs具有成核剂作用；然而，结晶机理并未改变。尽管存在f-MWCNTs，但PBA/f-MWCNTs纳米复合材料中PBA的晶体结构保持不变。
