Live Radical Polymerization And Polyisoprene Cross-linking

In 1982, Japanese scholars Otsu et al proposed the concept of Iniferter and successfully applied to the living radical polymerization, free radical living/controlled polymerization into a new period of development historical, whose significant advantage was much more easy to prepare block and graft copolymers than other methods of polymerizable monomer. Many novel structures Iniferter have been synthesized and the preparated for end group functionalized polymers, telechelic polymers, macromonomers, block and graft copolymers.This dissertation consists of four chapters:Chapter 1:Describes several methods of living radical polymerization, highlighting the character and research progressof Iniferter, and the research application of photopolymeriz-ation and epoxy nutural rubber.Chapter 2:Synthesized and characterized more than 60 precursors by ATRP/Iniferter. Star bisblock copolymers polyisoprene/polymethyl methacrylate (PI/PMMA), polyisoprene/polystyrene (PI/PS) and star triblock compolymers polyisoprene/polymethyl methacrylate/polystyrene (PI/PMMA/PS) were synthesized respectively using 1,3,5-tris(ethyldimethylcar-bamodithioate)-2,4,6-trimethylbenzene synthesized by ourselves as initiator by iniferter polymerization. The structure and constituent of copolymers were characterized by IR and 1HNMR.Chapter 3:Epoxidized acrylated natural rubber crosslinked by polystyrene (SEANR) was synthesized by iniferter polymerization. The epoxidized acrylated natural rubber was firstly obtained by grafting of acrylic acid onto epoxidized natural rubber, and then performed a photocrosslinking reaction with polystyrene using polystyrene iniferter as a photoinitiator under UV irradiation. The structure and morphology were characterized by FT-IR,1H-NMR and SEM. The characterization results show that the desired products were successfully obtained. GPC results show that the number average molecular weight (Mn), weight average molecular weight (Mw) and polydispersity of the polystyrene iniferter using as photoinitiator were calculated 920,1340, and 1.46, respectively. AFM results show that polystyrene was uniformly distributed throughout the epoxidized acrylated natural rubber. The thermal performances of the product were evaluated by TG/DSC.