Study of the Kinetics of Free Radical Polymerization of Styrene in a Three Dimensional Network and Applications for Used Tire Recycling

Abstract : This thesis aims to develop a novel approach to value ground tire rubber (GTR). The latter results from grounding of the rubber part of used tires which retains excellent elasticity. The idea is to take the advantage of its elasticity to toughen brittle polymers such as polystyrene (PS) upon incorporating GTR into them. However, two challenges have to be overcome to realize this idea. (1) Commercial GTR is typically in the form of particles of a few hundreds of micrometers in diameter. However, it has to be at least one to two orders of magnitude smaller when incorporated in a brittle polymer so as to be able to improve its impact resistance. (2) The interfacial adhesion between the polymer and GTR is weak. These two challenges are related to the intrinsic nature of the GTR which is chemically cross-linked. This thesis chooses PS to represent brittle polymers. The approach aiming at toughening it is to polymerize styrene in a free radical manner inside cross-linked GTR particles. This leads to the formation of both free PS and PS that is grafted onto the GTR, denoted as grafted PS. The inclusions of the free PS inside the GTR particles help break them down by mechanical shear in a screw extruder for example and the formation of grafted PS improves the interfacial adhesion between the PS and the GTR. This thesis has developed a comprehensive kinetic model for the polymerization of free PS and that of grafted PS. This model is validated by experimental designs
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Submitted on : Friday, March 30, 2018 - 9:53:21 AM
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Ning Yu. Study of the Kinetics of Free Radical Polymerization of Styrene in a Three Dimensional Network and Applications for Used Tire Recycling. Food and Nutrition. Université de Lorraine, 2015. English. ⟨NNT : 2015LORR0277⟩. ⟨tel-01754566⟩

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