Poly chloroprenes properties

Property Fluorinated ydrocarbon T etrafluoro-ethylene/ propylene copolymer Fluorosillcone Perfiuoro- elastomer Polyurethane Poly- chloroprene Chloro- sulfonated polyethylene Ethylene/ propylene copolymer... 

Properties Ethylene propylene diene Nitrile rubber Poly- chloroprene Natural rubber Poly- isoprene Styrene butadiene rubber Butyl rubber Polybutadiene... 

The most studied systems have been polypyrrole/ PVC blends [372-5]. The electrochemical polymerization of pyrrole on a platinum electrode covered with a film of PVC produces a dark-brown, ductile and flexible composite polymer film with an electrical conductivity comparable to polypyrrole (5-50 S cm ), and mechanical properties very similar to PVC. Bargon et al. [373] have observed that the mechanical properties of these PPy/PVC blends can be further improved by the addition of poly(chloroprene) rubber as a plasticizer. 

Experiments were also performed with the aim of polymerizing a mixture of two monomers [88]. The reaction rate and the composition of the graft copolymer conform to the rules of mechanochemical synthesis and radical copolymerization. If the two monomers have almost equal reactivities, the composition of the copolymer is approximately that of the initial monomer mixture (Fig. 5.20). The reaction rate is also intermediate between those of the separate monomers. If the two mechanically activated monomers have different reactivities, the two monomers largely polymerize separately. The reaction rate depends on the polymer properties for the monomer that polymerizes first. As an example, in the system chloroprene-methyl methacrylate [88], the more active chloroprene polymerizes at first the reaction rate is low as polychloroprene is a flexible chain and the second monomer behaves as an inert solvent, reducing the viscosity. The reaction rate increases in the second part of the reaction when an appreciable amount of poly-(methyl methacrylate) is produced (see Fig. 5.21). Two monomers added... 

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