Poly(A-PTHF) can not be obtained from the conventional free radical polymerization,or atom transfer radical polymerization or reversible addition-fragmentation chain transfer polymerization of A-PTHF,due to low conversion and low degree of polymerization of poly(A-PTHF).Thus,the homo-polymerization of A-PTHF macromonomer was performed under 60Co γ-irradiation with EPDTB(1-(ethoxycarbonyl)prop-1-yl dithiobenzoate) as initiator.After precipitated from methanol,pure poly(A-PTHF) was obtained.The block copolymerization of St was performed using Poly(A-PTHF) as the transfer agent and DCP(dicumy peroxide) as the initiator.Both of the homo-polymerization and the following copolymerization are controllable.The evidences are the linear relationship between ln([M]-0/[M]) and polymerization time,the linear evolution of M n with conversion and the narrower polydispersities.The molecular structures of the poly(A-PTHF) and the block copolymer PSt-b-P(A-PTHF) were characterized by 1H-NMR as well as gel permeation chromatography(GPC).The polymerization mechanism of the homo-polymerization of(A-PTHF) and the copolymerization of poly(A-PTHF)with St were discussed respectively.
