Citation: Qi Liu, Hui-hui Li, Shou-ke Yan. Structure and Properties of -Polypropylene Reinforced by Polypropylene Fiber and Polyamide Fiber[J]. Chinese Journal of Polymer Science, ;2014, 32(4): 509-518. doi: 10.1007/s10118-014-1417-x shu

Structure and Properties of -Polypropylene Reinforced by Polypropylene Fiber and Polyamide Fiber

Qi Liu ¹ ,
Hui-hui Li ¹ ,
Shou-ke Yan ^1,,

1.
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Corresponding author: Shou-ke Yan,
Received Date: 13 October 2013
Revised Date: 13 December 2013

Fund Project: This work was financially supported by the National Natural Science Foundation of China (Nos. 50833006, 21274009 and 51221002).

Matrix/fiber composites of -form isotactic polypropylene (iPP) matrix and -iPP or PA6 fibers were prepared by laminating technique under different preparation temperatures. The mechanical properties and interfacial morphologies of these composites were studied by tensile test, optical microscopy and scanning electron microscopy, respectively. The experimental results show that the tensile yield load and tensile modulus of -iPP/PA6 matrix/fiber systems increased significantly at the expense of elongation at break. These mechanical properties show essentially no dependence on the sample preparation temperature. On the other hand, the mechanical properties of iPP matrix/fiber single polymer composites depend strongly on the sample preparation temperature. At low sample preparation temperature, e.g., 172 ℃, the solid -iPP fiber induces -iPP crystallization, leading to the formation of -iPP transcrystalline layer around the fiber. This results in a remarkable increment of the tensile yield load and tensile modulus. The elongation at break is also much better than that of the iPP/PA6 matrix/fiber system. It reflects a better interfacial adhesion of the single polymer composite compared with the iPP/PA6 composite. At higher sample preparation temperature, e.g., 174 ℃ or 176 ℃, the partial surface melting of the oriented fiber allows interdiffusion of iPP molecular chains in the molten fiber and matrix melt. The penetration of matrix chains into the molten iPP fiber results in some iPP molecular chains being included partially in the recrystallized fiber and the induced -transcrystalline layers. This kind of configuration leads to an improvement of interfacial adhesion between the fiber and matrix, which causes a simultaneous increase of the tensile yield load, tensile modulus and elongation at break of -iPP.
- Polypropylene,
- Composite,
- Mechanical property,
- Interfacial morphology
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