Ethylene-sulfur dioxide copolymer

The olefin-sulfur dioxide copolymers are thermoplastic and colorless transparent coherent moldings can be prepared. The properties of the polymers vary from that of ethylene-sulfiir dioxide, which is very interactable, to 1-decene-sulfur dioxide, which is soft, rubbery, and soluble in many organic solvents. The... 

It has been shown by Barb and by Dainton and Ivin that a 1 1 complex formed from the unsaturated monomer (n-butene or styrene) and sulfur dioxide, and not the latter alone, figures as the comonomer reactant in vinyl monomer-sulfur dioxide polymerizations. Thus the copolymer composition may be interpreted by assuming that this complex copolymerizes with the olefin, or unsaturated monomer. The copolymerization of ethylene and carbon monoxide may similarly involve a 1 1 complex (Barb, 1953). 

A free radical polymerization reaction in the presence of a peroxide or hydroperoxide can take place between an olefin and SO2. The resulting poly(olefin sulfone) may have a variable composition (variable content of SO2), but poIy(ethylene-a/f-sulfur dioxide), CAS 110711-58-5, or poly(ethylene sulfone) can be obtained. Different olefins can be used in the reaction, as well as butadiene. Poly(sulfur dioxide-co-alkenes) may have a variable composition from 1.1 mole ratio (a/t copolymer) to various other monomer ratios. 

Absent from Table 10 are the comonomers carbon monoxide, carbon dioxide, and sulfur dioxide. These comonomers are not included because their copol mieiization does not obey the normal copolymer model illustrated by reactions (vix—xvii) and hence cannot be described by kinetic parameters which take into account only these reactions. For example. Furrow (/28) has i own that caibon dioxide will react with growing polyethylene chains in a free-radical reaction, but that it terminates the chains giving carboxylic acids. It does not copolymerize in the usual sense (which would give polyesters). Carbon monoxide and sulfur dioxide appear not to obey the normal cppol3nner curve of feed composition versus polymer composition and it has been reported that these materials form a complex with ethylene whidi is more reactive than free CO or SOg, perhaps a 1 1 complex. Copolymerization of both CO and SO is further complicated by a ceiling temperature effect. Cppolymerization has been carried out with ethylene and these monomers, however, and poly-ketones and pol3Tsufones are the resultant products. 

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