Unbranched polymers, stability

Polymers are formed, together with borazines, from iminoboranes RBNR with a-unbranched alkyl groups. By absolute control of the temperature, the stabilization would presumably be directed toward the borazine. Loss of thermal control will cause a loss of kinetic control, so that hot iminoborane molecules will trimerize or polymerize rather unspecifically. 

The need for a broad development of the production of polymer materials has become evident. All these materials are subject to various types of aging (destruction) hence, stabilizers which permit the storage, reprocessing, and use of polymer materials without any appreciable change in their properties must be introduced into them. In recent years, this problem of stabilizing polymers has attracted the attention of many scientists and technologists, both in the USSR and abroad. The scientific basis of the foreign studies will be found in a number of theoretical premises, but chiefly the theory of chain reactions with unbranched chains. 

The oxidative stabilities of hydrocarbon polymers in the absence of added initiators differs by two orders of magnitude, from the relatively stable unbranched polyethylenes through the branched polypropylene to the... 

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