Thermal degradation kinetics and lifetime estimation for polycarbonate/polymethylphenylsilsesquioxane composite

doi:10.1007/s11705-009-0006-y

Front Chem Eng Chin

2009, Vol. 3

Issue (2) : 167-171 https://doi.org/10.1007/s11705-009-0006-y

RESEARCH ARTICLE

Thermal degradation kinetics and lifetime estimation for polycarbonate/polymethylphenylsilsesquioxane composite

Jiangbo WANG, Zhong XIN(

)

State Key Lab of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

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Abstract

The thermal degradation behaviors of polycarbonate/polymethylphenylsilsesquioxane (FRPC) composites were investigated by thermogravimetric analysis (TGA) under isothermal conditions in nitrogen atmosphere. The isothermal kinetics equation was used to describe the thermal degradation process. The results showed that activation energy (E), in the case of isothermal degradation, was a quick increasing function of conversion (α) for polycarbonate (PC) but was a strong and decreasing function of conversion for FRPC. Under the isothermal condition, the addition of polymethylphenylsilsesquioxane (PMPSQ) retardanted the thermal degradation and enhanced the thermal stability of PC during the early and middle stages of thermal degradation. It also indicated a possible existence of a difference in nucleation, nuclei growth, and gas diffusion mechanism in the thermal degradation process between PC and FRPC. Meanwhile, the addition of PMPSQ influenced the lifetime of PC, but the composite still met the demand in manufacturing and application.

Keywords polycarbonate polymethylphenylsilsesquioxane thermal degradation kinetics activation energy lifetime

Corresponding Author(s): XIN Zhong,Email:xzh@ecust.edu.cn

Issue Date: 05 June 2009

Cite this article:

Jiangbo WANG,Zhong XIN. Thermal degradation kinetics and lifetime estimation for polycarbonate/polymethylphenylsilsesquioxane composite[J]. Front Chem Eng Chin, 2009, 3(2): 167-171.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-009-0006-y
https://academic.hep.com.cn/fcse/EN/Y2009/V3/I2/167

Fig.1 Isothermogravimetric curves for PC and FRPC in nitrogen

Fig.2 Relation between degree of conversion and time of PC and FRPC

Fig.3 Arrhenius dependence of ln

Tab.1 Kinetic data for isothermal degradation of PC and FRPC

Fig.4 Temperature-time curves of PC and FRPC with variant degree of conversion

Tab.2 Time needed with the variant degree of conversion for PC and FRPC at 420°C　(unit: min)

Tab.3 of PC and FRPC at variant temperature　(unit: min)

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