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Materials 2016, 9(6), 448; doi:10.3390/ma9060448

The Effect of the Melt Viscosity and Impregnation of a Film on the Mechanical Properties of Thermoplastic Composites

Department of Textile Engineering and Technology, Yeungnam University, Gyeongsan 712-749, Korea
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Academic Editor: Reza Montazami
Received: 6 April 2016 / Revised: 28 May 2016 / Accepted: 1 June 2016 / Published: 3 June 2016
(This article belongs to the Section Manufacturing Processes and Systems)
View Full-Text   |   Download PDF [4975 KB, uploaded 3 June 2016]   |  

Abstract

Generally, to produce film-type thermoplastic composites with good mechanical properties, high-performance reinforcement films are used. In this case, films used as a matrix are difficult to impregnate into tow due to their high melt viscosity and high molecular weight. To solve the problem, in this paper, three polypropylene (PP) films with different melt viscosities were used separately to produce film-type thermoplastic composites. A film with a low melt viscosity was stacked so that tow was impregnated first and a film with a higher melt viscosity was then stacked to produce the composite. Four different composites were produced by regulating the pressure rising time. The thickness, density, fiber volume fraction (Vf), and void content (Vc) were analyzed to identify the physical properties and compare them in terms of film stacking types. The thermal properties were identified by using differential scanning calorimetry (DSC) and dynamical mechanical thermal analysis (DMTA). The tensile property, flexural property, interlaminar shear strength (ILSS), and scanning electron microscopy (SEM) were performed to identify the mechanical properties. For the films with low molecular weight, impregnation could be completed fast but showed low strength. Additionally, the films with high molecular weight completed impregnation slowly but showed high strength. Therefore, appropriate films should be used considering the forming process time and their mechanical properties to produce film-type composites. View Full-Text
Keywords: thermoplastic composite; impregnation; melt viscosity; pressure rising time; mechanical properties thermoplastic composite; impregnation; melt viscosity; pressure rising time; mechanical properties
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kim, J.W.; Lee, J.S. The Effect of the Melt Viscosity and Impregnation of a Film on the Mechanical Properties of Thermoplastic Composites. Materials 2016, 9, 448.

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