Prediction of viscoelastic behavior of interphase in polypropylene-chopped rice husk composites for β-relaxation domain

The effect of chopped rice husk (CRH) content on viscoelastic properties and crystallinity of polypropylene (PP) composites was investigated. Composites containing 0, 20, and 40 part per hundred plastics (php) of CRH into PP were prepared by twin-screw extruder, with maleic anhydride-grafted PP as t...

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Bibliographic Details
Published in:Journal of applied polymer science 2011-05, Vol.120 (3), p.1642-1651
Main Authors: Ershad-Langroudi, Amir, Razavi-Nouri, Mohammad, Oromiehie, Abdulrasoul
Format: Article
Language:English
Subjects:
Applied sciences
Composites
Crystallinity
Differential scanning calorimetry
Exact sciences and technology
Forms of application and semi-finished materials
Interphase
Mathematical models
mechanical properties
poly(propylene) (PP)
Polymer industry, paints, wood
Polymer matrix composites
Polypropylenes
Scanning electron microscopy
simulations
Technology of polymers
thermal properties
Viscoelasticity
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Summary:The effect of chopped rice husk (CRH) content on viscoelastic properties and crystallinity of polypropylene (PP) composites was investigated. Composites containing 0, 20, and 40 part per hundred plastics (php) of CRH into PP were prepared by twin-screw extruder, with maleic anhydride-grafted PP as the coupling agent. The viscoelastic behavior and the crystallinity of these composites have been studied by dynamic mechanical analysis as well as differential scanning calorimetry, respectively. By the incorporation of CRH into PP, the storage modulus (E′) was found to be increased progressively, whereas the mechanical loss factor (tan δ) decreased in a nonlinear manner. A self-consistent analysis was proposed for the prediction of viscoelastic response of the interphase between PP matrix and CRH particles. A three-phase model was applied in a reverse mode, and the viscoelastic behavior of the interphase was extracted and compared with the unfilled matrix. Differential scanning calorimetry results indicated that CRH influences crystallization temperature as well as the degree of crystallinity of the composites. An entrapped polymer within CRH filler and PP matrix was detected by scanning electron microscope, which can be attributed to the interfacial layer with a good adhesion between the main components.
ISSN:0021-8995
1097-4628
1097-4628
DOI:10.1002/app.33281