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Citation: ZHANG Wei-Wei, YUAN Qiang, SUN Zhao-Yan, AN Li-Jia, LI Dong-Feng. The Measurement of Thermal Expansion Coefficient and Isothermal Compressibility for Polypropylene Random Copolymers[J]. Chinese Journal of Applied Chemistry, ;2004, 21(8): 757-761. shu

The Measurement of Thermal Expansion Coefficient and Isothermal Compressibility for Polypropylene Random Copolymers

1.
a State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022;
2.
b College of Biological Engineering, Changchun University of Technology, Changchun

Corresponding author: SUN Zhao-Yan,
Received Date: 19 September 2003
Available Online: 10 January 2004
Fund Project: 国家自然科学基金青年基金(20304015)项目和国家重点基础研究发展项目(G1999064800) (20304015)项目和国家重点基础研究发展项目(G1999064800)

The pressure-volume-temperature (P-V-T) properties of four kinds of polypropylene (PPR) random copolymer were measured on the PVT-100 apparatus. Their thermal expansion coefficient (α) and isothermal compressibility (β) were evaluated using the definition method and Tait equation, respectively. The results obtained by two methods agree with each other when the calculation is done for temperatures higher than the crystallization temperature(T_C). It is also found that at 20~30 MPa or 80~100 MPa, β and T_C of QiLu random copolymer polypropylene(QLPPR) are lower than that of others.
- polypropylene random copolymer,
- thermal expansion coefficient,
- isothermal compressibility,
- Tait equation
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