Investigation of Thiol-ene Addition Reaction on Poly(isoprene) Under UV Irradiation: Synthesis of Graft Copolymers with "V"-Shaped Side Chains
writer：Guowei Wang, Xiaoshan Fan, Junlian Huang*
keywords：thiol-ene addition reaction
source：期刊
specific source：J. Polym. Sci. Part A: Polym. Chem. 2010, 48, 3797-3806.
Issue time：2010年
Poly(isoprene) (PI) with pendant functional groups was successfully synthesized by thiol-ene addition reaction under 365 nm UV irradiation, and the functionalized PI was further modified and used to prepare graft copolymers with ‘‘V’’- shaped side chains. First, the pendant ASCH2CH(OH)CH2OH groups were introduced to PI by thiol-ene addition reaction between 1-thioglycerol and double bonds, and the results showed that the addition reaction carried out only on double bonds of 1,2-addition isoprene units. After the esterification of hydroxyl groups by 2-bromoisobutyryl bromide, the forming macroinitiator was used to initiate the atom transfer radical polymerization (ATRP) of styrene (St) and tert-butyl acrylate (tBA), and the graft copolymers PI-g-PS2 and PI-g-PtBA2 or PIg-PAA2 (by hydrolysis of PI-g-PtBA2) were obtained, respectively. It was confirmed that the graft density of side chains on PI main chains could be easily controlled by variation of the contents of modified 1,2-addition isoprene units on PI.