Reprocessability and melting behaviour of self-reinforced composites based on PP homo and copolymers

In our present study, the reprocessability of a self-reinforced PP composites (SRPPC) prepared by compression molding was studied. The composite materials (handled separately, based on the related matrix material) were ground, then extruded five times and injection molded after the first and fifth c...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2010-07, Vol.101 (1), p.255-263
Main Authors: Bárány, Tamás, Izer, András, Menyhárd, Alfréd
Format: Article
Language:English
Subjects:
Analytical Chemistry
Applied sciences
Chemistry
Chemistry and Materials Science
Composite materials industry
Composites
Exact sciences and technology
Forms of application and semi-finished materials
Injection molding
Inorganic Chemistry
Mathematical analysis
Matrices
Matrix methods
Measurement Science and Instrumentation
Melting
Physical Chemistry
Polymer industry, paints, wood
Polymer matrix composites
Polymer Sciences
Polypropylenes
Reprocessing
Technology of polymers
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Summary:In our present study, the reprocessability of a self-reinforced PP composites (SRPPC) prepared by compression molding was studied. The composite materials (handled separately, based on the related matrix material) were ground, then extruded five times and injection molded after the first and fifth cycle in order to investigate the behaviour of the material during reprocessing. As a reference, the matrices of the composites were also reprocessed and injection molded similarly to the composites. On the manufactured specimens, static (tensile and flexural) and dynamic mechanical tests (Charpy) were performed. The melting and crystalline characteristics were studied by Differential Scanning Calorimetry (DSC). The probable decomposition caused by multiple extrusions was followed by the Melt Volume Rate (MVR). The results indicated that in case of commercial materials there is no significant degradation even after multiple reprocessing cycles; therefore, the reprocessability of SRPPC products has no hindrance. The presence of α-iPP reinforcement in the rPP-based composites after reprocessing results in increased inclination for crystallization and consequently leads to improved mechanical stiffness compared to rPP neat matrices.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-010-0741-9