This paper discusses four closely related themes, (a) First, we present the synthesis of new butyl rubber graft copolymers that have a polyisobutylene backbone and several free-radical polymerized polymers, such as poly(methyl methacrylate), in the side chains. The chemistry involves commercial butyl rubber, poly(isobutylene-co-isoprene) and free-radical graft-from reaction using a borane reagent. (b) The selective autoxidation reaction of secondary alkyl-9-borabicyclononane offers the conditions for producing desirable polymeric radicals in graft-from polymerization with high grafting efficiency and controllable copolymer compositions. (c) The structure of graft copolymers is characterized. Several techniques, especially gel permeation chromatography measurement with on-line refractive index, photodiode-array and light scattering detectors, were used to provide detailed microstructural information. (d) Finally, compatibility is studied using graft copolymers as the compatibilizers in polyisobutylene blends.
All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry