Modification of Polymers Within Backbone and Chain Ends

CHEMICAL MODIFICATION OF POLYMERS WITHIN BACKBONE AND CHAIN ENDS 

Polymer properties are dependent on many factors, including chain end interactions with substrates such as carbon black or silica fillers, as well as clay 

This approach was made possible via the reaction of metallic chain ends with aetive metal halide as shown on the following page, such as tin tetrachloride and silica terachlorides. These types of reactions led to increased moleeular weight as well as improvements in polymer filler interactions that result in improved properties of the polymers [4]. 

Modifieation of polymers through the introduction of polar moieties such as amine siloxy groups made by anionic catalysts or so-called living polymerizations are made by either functional initiators or by chain functional monomers, as has been reported by several groups. The functional initiators are cyelic amines attached to alkyl groups and the functional monomers are based on styrene and disoproenyl benzene [5-9]. 

More recently, a U.S. Patent has been issued to the Goodyear Tire and Rubber Company, which claimed that polar functional monomers could be copolymerized with conjugated dienes and vinyl aromatics to chemically modify the polymer chain. Functional monomers, such as 3-(2-pyrrolidi-noethyl) styrene  

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II. Chemical Modification of Polymers Within Backbone and Chain Ends... 

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