在线阅读 --自然科学版 2020年3期《丝素纳米复合材料的热分解反应动力学及热力学》
丝素纳米复合材料的热分解反应动力学及热力学--[在线阅读]
刘浩1,2, 李莹莹1,2, 邓谦谦1,2, 蔡博文1,2, 顾正桂2, 王昉1,2
1. 南京师范大学 分析测试中心, 江苏 南京 210023;
2. 南京师范大学 化学与材料科学学院, 江苏 南京 210023
起止页码: 251--259页
DOI: 10.13763/j.cnki.jhebnu.nse.2020.03.010
摘要
对静电纺丝技术制备的丝素/聚乳酸纳米纤维复合膜进行了扫描电子显微镜观察和热重分析,利用Kissinger,Ozawa-Doyle,Vyazovkin动力学模型及Achar微分法、Coats-Redfern积分法比较了2种不同质量比(1∶5和2∶5)的丝素纳米复合膜的热分解反应动力学.结果表明,2种材料纳米纤维结构具有热力学宏观相容性,聚乳酸含量高的丝素纳米复合膜的起始分解温度、活化能和活化焓较高;丝素纳米复合膜在473~618K的热分解过程中,SP1-5与SP2-5试样的最佳机理函数为fα)=4(1-α3/4fα)=4{(1-α)}1/2.

Thermal Decomposition Kinetics and Thermodynamics of Silk Fibroin Nanocomposites
LIU Hao1,2, LI Yingying1,2, DENG Qianqian1,2, CAI Bowen1,2, GU Zhenggui2, WANG Fang1,2
1. Analysis and Testing Center, Nanjing Normal University, Jiangsu Nanjing 210023, China;
2. College of Chemistry and Materials Science, Nanjing Normal University, Jiangsu Nanjing 210023, China
Abstract:
Scanning electron microscopy (SEM)and thermogravimetric analysis (TGA)were performed on the silk fibroin/polylactic acid nanofiber composite membranes prepared by electrostatic spinning.Thermal stability and decomposition characteristics of two silk fibroin composite membranes with different proportions(1:5 and 2:5) were compared by Kissinger,Ozawa-Doyle,and Vyazovkin,as well as Achar differential and Coats-Redfern integral methods.Results showed that the parameters of initial decomposition temperature,activation energy and activation enthalpy of silk fibroin nanocomposite membrane with high poly(lactic acid) content were higher.During the thermal decomposition of silk fibroin nanocomposite film at the stage of 473~618K,the best mechanism functions of SP1-5 and SP2-5 samples are f(α)=4(1-α)3/4f(α)=4{(1-α)}1/2.

收稿日期: 2020-02-23
基金项目: 国家自然科学基金(21973045);江苏省高校自然科学基金(15kJB150018)

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