The major application of polyolefin foams is in thermal insulation, packaging, construction and sport and leisure industries. The most widely used cross-linked polyolefin foam is based on cross-linked polyethylene. Polyethylene can be cross-linked by peroxide involving free radical generation which can result in intermolecular covalent bonding and three-dimensional network formation. Coagents are low molecular weight with two or more reactive double bonds. In cure system, coagent reacts with free radical which are generated by using peroxide, to increase the efficiency of cure to give more crosslinks. Addition of coagent reduces cure time, improves resistance to oil and fuels, improves heat aging, improves peroxide efficiency, improves flexibility and gives higher tensile strength and hardness. In this study, we investigated synthesis of coagent based on ethylene glycol dimethacrylate from ethylene glycol and methacrylic acid. The product was obtained at a temperature of 110°C, with molar ratio MA/EG: 1.1/0.5 yielded 93.5%. Structural characteristics of the product was measured by FT-IR, TG and 1H-NMR. The product had a density of 1.0456 g/cm3 (at 20°C), acidity index of 1.5 mg KOH/g, and dynamic viscosity of 5.39 cP (at 20°C).
Key words: Polyethylene; polyethylene vinylacetate foam; coagent; ethylene glycol dimethacrylate
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