Other Saturated Polymers and Copolymers

Mechanochemical and thermal processes have been used to graft MA to poly (isobutylene) and poly(vinyl chloride). Mechanochemical graft- 

Maleic anhydride may be grafted to polystyrene by both free-radical/  

Photochemical addition of MA to polystyrene has been observed in dioxane solvent, using photosensitizers and radiation with A 340 It is thought that the sensitized photoaddition proceeds via an attack by the excited anhydride triplet state on the charge-transfer complex between the anhydride and the aromatic nucleus. Photochemical reaction of benzene and alkyl substituted aromatics with MA are known to give a variety of potentially useful products (see Chapter 6). 

The MA-grafted polystyrene materials are claimed to be useful as vulcanizing agents for rubber and a modifier for improving the structure 

The phenyl groups on polystyrene have also been modified by treatment with MA using cationic catalysts such as boron trifluoride to obtain carboxy-lated materials.Properties of these materials remain to be studied. 

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