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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: POSTER: Polymer Physics

CPP 8.28: Poster

Monday, March 26, 2007, 16:00–18:00, Poster B

The effect of matrix molecular weight on the interfacial morphology of iPP fiber/matrix single polymer composites — •Xiaoli Sun, Huihui Li, and Shouke Yan — State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100080, P.R. China

To prepare samples of β-iPP, selective β-nucleants are commonly used. Moreover, crystallization of commercial iPP in temperature gradient, and forcing shearing in melt can also encourage the development of the β-phase.

In our previous studies, the interfacial structure of the iPP fiber/matrix polymer composites as a function of the fiber introduction temperature, fiber molecular weight as well as the subsequent crystallization temperature of the matrix was studied. It was found that partial melting of the iPP fiber is in favor of the formation of β-iPP crystals. In the present study, the influence of matrix molecular weight on the induced interfacial structure was studied. The matrix with lower molecular weight can be easily initiated to form β-iPP cylindrite by incomplete molten iPP fiber as researched previous. The matrix with higher molecular weight, however, cannot be induced to form β-iPP cylindrite when the isothermal crystallization is equal to 135 °C. But when using β-nucleating agent this matrix is able to effectively form β-spherulites when the isothermal temperature is under 140 °C. This can be explained in terms of different requirement for different matrix molecular weight chain to form β-iPP when iPP fiber was used to induce its matrix crystallization.