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Maekawa, Yasunari; Enomoto, Kazuyuki; Takahashi, Shuichi; Hamakawa, Shotaro
no journal, ,
The polymer grafts (PSSA) attached on fluorinated polymer substrates (ETFE), which were prepared by radiation-induced grafting of styrene and subsequent sulfonation, were successfully isolated by swelling-induced detachment from the polymer substrates in hot water. Then, the number-averaged molecular weight (Mn) of the grafts can be determined using GPC. The Mn was almost constant but the number of grafting chains linearly increased with increasing grafting degrees. The above results clearly show that the radiation-induced grafting of styrene is gradually initiated during grafting period but rapidly terminated to give lower Mn, compared with that in polyethylene.
Hamakawa, Shotaro; Hasegawa, Shin; Maekawa, Yasunari
no journal, ,
The graft polymers of a graft-type polymer electrolyte membrane consisting of poly(styrenesulfonic acid) (PSSA) attached on thermally stable fluorinated polymer substrates detached from the polymer substrate without decomposition or scission of graft polymer chains. In this work, the molecular weights of detached graft polymers were analyzed by gel permeation chromatography to investigate the mechanism of radiation-induced graft polymerization of styrene into the fluorinated polymer substrates. The number average molecular weight (Mn) of graft polymers seemed to be constant with Mn of about 3500 in the range of grafting degrees between 6 and 86%. Thus, graft polymerization proceeds with quite fast initiation and termination reactions to give a similar Mn of the graft polymers during the whole course of graft polymerizations.