微孔聚乳酸支架材料的热稳定性与动态热机械特性

引用本文: 王昉, 盛沈俊, 郭各朴, 马青玉. 微孔聚乳酸支架材料的热稳定性与动态热机械特性[J]. 物理化学学报, 2013, 29(12): 2505-2512. doi: 10.3866/PKU.WHXB201310213 shu

Citation: WANG Fang, SHENG Shen-Jun, GUO Ge-Pu, MA Qing-Yu. Thermal Stability and Dynamic Thermal Mechanical Properties of Microcellular Polylactic Acid Scaffolds[J]. Acta Physico-Chimica Sinica, 2013, 29(12): 2505-2512. doi: 10.3866/PKU.WHXB201310213 shu

微孔聚乳酸支架材料的热稳定性与动态热机械特性

基金项目:
国家自然科学基金(11274176) (11274176)

江苏省教育厅自然科学基金(09KJD350001) (09KJD350001)

南京市开放实验室基金(1640703064)资助项目 (1640703064)

摘要:

采用无溶剂二氧化碳固态发泡技术, 在2.5、3.5、4.0和5.0 MPa饱和压力下制备了泡孔孔径为350-20μm的聚乳酸支架材料. 利用热重分析技术、动态热机械分析技术和扫描电子显微镜技术, 测定了材料的起始分解温度、分解速率、储存/损耗模量和损耗因子等参数, 并利用Kissinger、Ozawa-Doyle 和Vyazovkin 方程进行了热分解动力学计算, 推算了氮气环境下材料的降解时间和使用寿命. 结果表明, 随着发泡压力的减小, 支架材料的泡孔孔径增大, 材料的柔韧性增强, 表观活化能降低, 降解时间缩短.

关键词:

English

Thermal Stability and Dynamic Thermal Mechanical Properties of Microcellular Polylactic Acid Scaffolds

1.
1 Center of Analysis and Testing, Nanjing Normal University, Nanjing 210023, P. R. China;
2 School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, P. R. China;
3 Physics School, Nanjing University, Nanjing 210093, P. R. China;
4 Key Laboratory of Optoelectronics of Jiangsu Province, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, P. R. China
Received Date: 14 August 2013
Available Online: 28 November 2013
Fund Project:
国家自然科学基金(11274176)

江苏省教育厅自然科学基金(09KJD350001)

南京市开放实验室基金(1640703064)资助项目

Abstract:

Solvent-free solid-state foaming technology was used to fabricate microcellular polylactic acid (PLA) scaffold materials with cell sizes from 350 to 20 μm at saturation pressures of 2.5, 3.5, 4.0, and 5.0 MPa in carbon dioxide. The corresponding thermodynamic parameters were measured, including the decomposition temperature and rate, storage/loss modulus, and loss factor, using thermogravimetric analysis, dynamic thermal mechanical analysis, and scanning electron microscopy. The Kissinger, Ozawa-Doyle, and Vyazovkin equations were used to calculate the thermal decomposition kinetics for PLA foams of different cell sizes; their lifetimes in nitrogen were also obtained. It was observed that PLA foams with larger cell sizes, lower average activation energies, and better flexibilities could be fabricated at lower saturation pressures, resulting in reduced decomposition times.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

微孔聚乳酸支架材料的热稳定性与动态热机械特性

English

Thermal Stability and Dynamic Thermal Mechanical Properties of Microcellular Polylactic Acid Scaffolds

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

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CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

微孔聚乳酸支架材料的热稳定性与动态热机械特性

English

Thermal Stability and Dynamic Thermal Mechanical Properties of Microcellular Polylactic Acid Scaffolds

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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