Polypropylene carbonate
Polypropylene carbonate, PPC
Colorless solid
Fixed
25-45 ° C
Polypropylene carbonate (PPC) is a thermoplastic copolymer of the group of polycarbonates, prepared from the components carbon dioxide and propylene oxide. Catalysts such Zinkglutarate be used for the polymerization.
Properties
Polypropylene carbonate is soluble in polar solvents such as lower ketone, ethyl acetate and dichloromethane, and insoluble in alcohols, aliphatic hydrocarbons and water. PPC is permeable to oxygen. The glass transition temperature (Tg) is between 25 and 45 ° C. PPC is usually atactic and therefore does not crystallize.
The refractive index is 1.46 and the dielectric constant is 3
Representation
Such as polyethylene carbonate formed from the reaction of the alternating copolymer of an epoxide ( propylene oxide, here ) with carbon dioxide in the presence of an organometallic catalyst, typically organozinc compounds.
Applications
Polypropylene carbonate is used to increase the resistance of epoxy resins. Moreover, the material is used as binder in the ceramics industry, where it is decomposed during the sintering process, and escapes. Composite materials consisting of propylene carbonate and starch are used as biodegradable plastics.