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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 21, Number 4
JKCSEZ 21(4)
August 20, 1977 

Preparation of Epoxy-Methacrylate Prepolymer and Electron Beam Curing of Its Mixture with Monomers

Epoxy-Methacrylate Prepolymer의 합성 및 그의 단위체 혼합물의 전자선경화
Hyung-Chick Pyun, Wan-Bin Park, Ki-Yup Kim, Kyu-Suck Choi

변형식, 박완빈, 김기엽, 최규석
메타크릴산과 diglycidyl ether 형 저분자량의 에폭시수지로부터 에폭시수지의 dimethacrylate를 합성하였으며 이 prepolymer와 단위체인 스티렌 및 polyethyleneglycol dimethacrylate 혼합물의 전자선경화에 의하여 검사하였다. 에스테르화반응은 메타크릴산에 대하여 약 250∼300ppm이상의 hydroquinone과 1%(wt) 이하의 triethanolamine의 첨가로서 거의 정량적으로 진행되었다. 공기중에서 행한 경화에 있어서는 단위체 농도 10 ∼ 30%에서 최고의 겔분율을 나타내었으며 겔화속도는 prepolymer의 미반응 에폭시기와 산의 존재에 의하여 감소되었고 polyethyleneglycol dimethacrylate내의 polyethyleneglycol의 중합도가 증가함에 따라 증가하였다. 질소중과 공기중에서 겔화속도는 별다른 차이가 없었으나 생성물 성질의 차이로 보아 경화시의 산소의 영향은 상당히 컸으며 polyethyleneglycol dimethacrylate류를 단위체로 사용시는 더욱 그러하였다.

Epoxy-methacrylate prepolymer was synthesized from methacrylic acid and a diglycidyl ether type low molecular weight epoxy resin, and the electron beam curing of the prepolymer was studied using styrene and polyethyleneglycol dimethacrylates as comonomers. The esterification was carried out quantitatively without any side reaction adding more than 250∼300ppm hydroquinone and less than 1% (wt) triethanolamine by wt. of methacrylate acid, respectively. In the radiation curing under air atmosphere, the maximum gel fraction was observed at 10∼30% monomer contents. The rate of gel formation was decreased by the presence of unreacted epoxy group and acid in the prepolymer and increased with increasing degree of polymerization of polyethyleneglycol block in the dimethacrylates. Considerable oxygen effect in the curing, particularly when polyethyleneglycol dimethacrylate was used as a comonomer, was recognized through the differences of the product properties, though no remarkable differences were found in the rate of gel formation in air and nitrogen atmosphere.

284 - 292
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