セルロースへのアクリル酸メチルグラフトによる幹ポリマーの構造変化

抄録

Considering the process of formation of vinyl polymer among the cellulose chain molecules in swollen state, the decrystallization of cellulose in the process of the hindrance to reformation of secondary structure in amorphous region by deposited vinyl polymer during drying is expected.
The graft copolymer was prepared by reacting methyl acrylate with viscose rayon using ceric salt as catalyst in aqueous solution, and the change in fine structure of the product was mensured by various physical methods.
Following experimental results were obtained:
(1) Contribution of methyl acrylate polymer grafted to the tensile stress of grafted collulose is negligibly small.
(2) Crystallinity of cellulose is not changed by grafting.
(3) Dry modulus of grafted yarn decreases but wet modulus does not decrease noticeably by grafting.
(4) Second transition temperature of grafted cellulose decreases with increase of the polymer grafted.
(5) Coagulation order of cellulose is distributed to low oredr side by grafting.
From these experimental results following conclusions are obtained;
(1) Methyl acrylate polymer is formed in the amorphous cellulose chain molecules.
(2) This polymer does not change the crystallinity of cellulose.
(3) This polymer binders the amorphous cellulose chain molecules from ordered coagulation during the drying and fixes the molecules in loosely coagulated state.
From these points of view, it may be said that the grafting onto cellulose leads to the destruction of cellulose secondary structure in amorphous reglon or the fixation of the cellulose in the “pseudo swollen state”.