Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (11): 2915-2919.doi: 10.3866/PKU.WHXB20101028

• THERMODYNAMICS,THERMOCHEMISTRY AND SOLUTION CHEMISTRY • Previous Articles     Next Articles

Thermal Decomposition Kinetics of Poly(propylene carbonate maleate)

WU Wei-Kang1, WANG Jia-Li2, LIU Su-Qin1, HUANG Ke-Long1, LIU Yan-Fei1   

  1. 1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China;
    2. The Translational Medicine R &DCenter, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, Guangdong Province, P. R. China
  • Received:2010-05-14 Revised:2010-07-29 Published:2010-10-29
  • Contact: LIU Su-Qin E-mail:sqliu2003@126.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20976197) and Specialized Research Fund for the Doctoral Program of Higher Education of China (20090162120013).

Abstract:

The thermal decomposition kinetics of the novel terpolymer, poly(propylene carbonate maleate) (PPCMA), was investigated using thermogravimetric (TG) analysis at different heating rates. A new computational method called nonlinear approximation (NLA) is introduced in this work. The Flynn-Wall-Ozawa (FWO), Tang, Kissinger-Akahira- Sunose (KAS), and NLA methods were used to calculate the apparent activation energy (Ea). The results show that the NLA method is ideal for Ea calculations because of its simpler and more appropriate analysis process. It does, however, give slightly higher average relative errors for Ea compared to the other typical model-free methods. Calculations using the solid-state reaction model-fitting method indicated that the thermal decomposition process was composed of multiple mechanisms. For the whole decomposition process, the values of Ea were between 70 and 135 kJ·mol-1, and the pre-exponential factor (A) varied from5.24×104 to 9.89×107 min-1. The differences in Ea also explain the differences in decomposition temperature between poly(propylene carbonate) (PPC) and PPCMA.

 

Key words: Polycarbonate, Carbon dioxide, Thermal decomposition kinetics

MSC2000: 

  • O642