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

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: 21 October 2013
Fund Project: 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)

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.
- Polylactic acid scaffold,
- Solid state foaming,
- Thermogravimetric analysis,
- Dynamic thermal mechanical analysis,
- Thermal decomposition kinetics
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