Mechanical properties improvement of ground Tire Rubber/Thermoplastic composites produced by rotational molding

Authors: Dou, Yao
Advisor: Rodrigue, Denis
Abstract: In this work, ground tire rubber (GTR)/thermoplastic composites were successfully produced by combining a dry-blending technique with a rotational molding process. In order to improve the mechanical properties of the resulting composites, different modification methods were used. From the rotomolded composites produced, a complete set of characterization including morphological, physical (density and hardness) and mechanical properties (tensile, flexural and impact) was performed. The first part of the work investigated the effect of chemical blowing agent and maple wood fibers concentration, as well as two GTR surface treatments (maleated polyethylene (MAPE) in solution and microwave irradiation) on the mechanical properties of GTR/linear low density polyethene (LLDPE) composites. The second part of the work studied the effect of MAPE treated GTR on the mechanical properties of GTR/polypropylene (PP) composites. Overall, the results showed that MAPE treated GTR was an effective approach for improving the compatibility and interfacial adhesion between GTR and thermoplastic composites. For example, the impact strength of LLDPE/GTR (85/15) composite reached a 30% improvement by adding 0.3 wt.% MAPE above that of the same GTR content without MAPE treatment. A 52% improvement of impact strength for PP/GTR (50/50) by introducing 2 wt.% MAPE was obtained compared to the composite with the same content of untreated GTR.
Document Type: Thèse de doctorat
Issue Date: 2021
Open Access Date: 26 July 2021
Grantor: Université Laval
Collection:Thèses et mémoires

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