Polyvinyl chloride thermal conductivity

Core materials for composite sandwich components are foams such as those based on polyvinyl chloride (PVC). Those appropriate for the SO are high-quality PVC foams which show good long-term performance, are easy to work with, are very lightweight and show very good thermal insulation with low thermal conductivity. The core material selected will be from certified closed celT-type foam with technical characteristics as follows ... 

Copolymersof vinyl chloride with vinylidine chloride, produced by the suspension method, are more stable than the latex copolymers. The rates of thermal decomposition of polyvinyl chloride and the copolymer of vinyl chloride with vinylidine chloride, produced by the latex method, are practically the same for the latex copolymer, just as for the latex homopolymer, reversibility of the process of dehydrochlorination is observed [21]. In an investigation of the stability of copolymers of vinyl chloride with vinyl acetate, vinylidine chloride, and with vinylisobutyl ether in nucleophilic substitution reactions, it was found that the copolymer with vinyl acetate is the least stable to the action of alcoholic alkali the copolymers with vinylidine chloride and vinylisobutyl ether proved more stable [56]. The stability of the copolymer of vinyl chloride witii methyl acrylate is substantially increased when the degree of homogeneity of the copolymer with respect to composition is increased, and when monomers with a smaller content of impurities are used, as well as when the copolymerization is conducted in the presence of chain carriers [57, 58]. 

Dos Santos and Gregorio [38] measured the thermal conductivity of Nylon 6,6, PP, PMM A, rigid polyvinyl chloride (PVC), and polyurethane (PU) foam. 

Dos Santos and Gregorio [48] measnred the thermal conductivity of polyamide 6,6, polymethyl methacrylate, rigid polyvinyl chloride ether, and polyurethane foam. 

Transient hot-wire methods are most extensively used for the measurement of the thermal conductivity of polymers these include polyamides, polymethyl methyl acrylates, polypropylene, polyvinyl chloride, low-density polyethylene, and polystyrene. This technique has been discussed by several woikers [48,52-57]. 

Other polymers for which thermal conductivity data are available include polyamide 6,6, polypropylene, polymethyl methacrylate, rigid polyvinyl chloride, cellular polyethylene [58], polyvinylidene fluoride [59], polyvinylidene difluoride-ceramic composite [60], polyethylene [61], and polyamide films [61]. 

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