The equation of state and heat of fusion of poly(ether ether ketone)

Journal of Polymer Science, Part B: Polymer Physics - Tập 27 Số 5 - Trang 993-1007 - 1989
P. Zoller1, Thomas A. Kehl1, Howard W. Starkweather2, Glover A. Jones2
1University of Colorado, Department of Mechanical Engineering, Boulder, Colorado 80309‐0427
2Du Pont de Nemours & Company, Central Research and Development Department, Experimental Station, Wilmington, Delaware 19880‐0356

Tóm tắt

AbstractThe pressure‐volume‐temperature properties of poly(ether ether ketone) (PEEK) were studied experimentally at temperatures of 400°C and pressures to 200 MPa. Specific volume data were fitted successfully to the empirical Tait equation for T < Tg and T > Tm and to the theoretical Simha‐Somcynsky equation of state for the melt. The pressure dependence of the glass‐transition temperature is about 0.57–0.59°C/MPa and that of the melting point 0.483°C/MPa. The pressure dependence of the melting point, the specific volume of the melt at Tm, and the specific volume of the crystal at Tm determined from x‐ray diffraction data at elevated temperatures were combined in the Clapeyron equation to calculate a heat of fusion of 161 ± 20 J/g for the PEEK crystal. This value is somewhat higher than the previously reported value of 130 J/g.

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Tài liệu tham khảo

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Thông tin xuất bản

Journal of Polymer Science, Part B: Polymer Physics

Tập 27 Số 5

993-1007

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