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POLYSTYRENE/POLYETHYLENE OXIDE COPOLYMER FOR ENHANCING WATER VAPOR PERMEABILITY IN THERMOPLASTIC FOAMS.
POLYSTYRENE/POLYETHYLENE OXIDE COPOLYMER FOR ENHANCING WATER VAPOR PERMEABILITY IN THERMOPLASTIC FOAMS.
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机译:聚苯乙烯/环氧乙烷共聚物,用于提高热塑性塑料泡沫中的水蒸气渗透性。
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摘要
Polymeric foam and polymeric foam products that contain a foamable polymer material, at least one blowing agent, a polystyrene/polyethylene oxide copolymer, and optionally, an infrared attenuating agent, are provided. In exemplary embodiments, the blowing agent includes at least one hydrofluorocarbon blowing agent. The maleic anhydride- styrene copolymer grafted with polyethylene oxide provides a water vapor permeability of 1.1 perm inch or greater in the extruded foam product without detrimentally affecting physical or thermal properties of the product. Additionally, the copolymer of maleic anhydride-styrene grafted with polyethylene oxide has a positive affect on the processability of the blowing agent(s) in the composition by both widening the process window and enhancing the solubility of the blowing agent in the polymer melt. Thus, the polystyrene/polyethylene oxide copolymer present in the inventive composition acts as a cell enlarger, a plasticizer, and a processing aid. A method of forming an extruded foam product is also provided.
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