Polymer(Korea), Vol.4, No.2, 138-144, March, 1980
Poly(Methyl Methacrylate)에 대한 Viny Acetate의 광조사 그래프팅
Photoinduced Graft Copolymerization of Vinyl Acetate to Poly (Methyl Methacrylate)
초록
고흡수 상태에서 강도가 높은 hydrogel을 개발할 목적으로 2,3-butanedione-o-methacryloyl oxime(이하 BMO라 약함)을 합성하고 그 광분해 특성을 조사하였으며 BMO와 methyl methacrylate(이하 MMA라 약함)의 공중합물[poly (MMA-co-BMO)]을 만들어 여기에 대한 vinyl acetate의 광조사 그래프팅을시도하였다. BMO는 360nm 부근인 장파장 영역에서도 광분해가 잘 일어났으며 광분해 속도는 BMO 농도에 1차였다. PMMA에 대한 vinyl acetate의 광조사 그래프팅은 전혀 일어나지 않았으며 poly(MMA-co-BMO)리 대하여는 동일한 조건하에서 잘 이루어졌다. 이때 그래프트율은 반응초기에는 매우 낮았으나 시간에 따라서는 괴상중합시의 중합곡선경향과 흡사하게 급격히 증가하였다. 광조사 그래프트 중합속도는 대체로 BMO몰분율의 평방근에 비례하였다.
A method for the development of a super hard hydrogel at the high water absorption state is proposed synthesizing 2,3-butanedione-o-methacryloyl oxime (BMO), studying its photolysis character, and intending to photoinduced graft copolymerization of vinal acetate onto combined poly MMA-BMO. Rapid photolysis reaction for BMO was occurred at the rather long range that was even to 360nm wavelength. The photolysis reaction rate was found first order to the BMO mole concentration. Photoinduced graft copolymerization of vinyl acetate to PMMA was never happened, but the reaction to poly (MMA-co-BMO) took place very nicely at the same conditons. Graft ratio was found bottom low at the start of the polymerization, but in process of time it was achieved rapid growth as similar manner as that of polymerization curve in the bulk polymerization. The rate of photoinduced graft copolymerization has been shown some linearity to the root mean square mole fraction of BMO.