Promising Oligomeric Foams

The ever increasing demand for foamed polymers stimulates research aimed at the extension of the raw material base and variety of these materials. In this connection it is necessary to consider the types of oligomeric foams which have not yet left the laboratories , but which, in our opinion, are very promising for the further development of the industry of gas-filled polymers. 

Without considering in detail the chemical classification of RO, we shall only note that all types of RO may be divided into two groups  

RO capable of hardening without formation of side products - polymerizable oligomers. 

RO which form polymers with the formation of low-molecular weight products -polyreactive oligomers. 

OFM are viscous liquids, or readily fusible resinTike substances, capable (in the presence of intiators or upon irradiation) of three-dimensional radical copolymerization with several active monomers (styrene, vinyltoluene, methylmethacrylate and others). The properties of the network copolymers formed largely depend on the chemical nature of the reagents and the copolymerization conditions. Hardening of OFM may be carried out at room temperature, or even lower, using mixtures 

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Among promising oligomeric foams one should also mention 2-pyranyl foams for a discussion of the chemistry, technology and properties of these materials see Finally, several works concerned with the preparation of foams from cumaron-indene and aniline-formaldehyde oligomers have been reported ... 

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