The free radical copolymerization of N-methylolacrylamide(M₁) with styrene (M₂) was studied in three different kinds of solvents(ie., dimethyl sulfoxide, ethanol, and dioxane) at 70℃ using α, α''-azobisisobutyronitrile as an initiator. The monomer reactivity ratios by Kelen-Tudos method were calculated as follows : Dimethyl sulfoxide, r_l=0.12, r₂=2.59 ; Ethanol, r₁=0.29, r₂=1.28 ; Dioxane, r_l=1.30, r₂=1.35. A strong influence of solvent on the monomer reactivity ratios was observed, and the effect of solvent upon the N -methy lolacrylamide was confirmed by the shift of the peaks corresponding to the amide carbonyl and amide N-H group in the infrared spectra of the solution. The greater is the shift in the C=O absorption peak towards lower wavenumber (ν), the smaller is the amount of the N -methylolacrylamide in the prepared copolymers. It can be concluded with these results that the hydrogen bonding and dipole-dipole interaction depending on the nature of solvents (polarity, dielectric constant etc.) could affect the polarity and reactivity of the double bond in the N-methylolacrylamide.

N-methylolacrylamide(M₁)와 styrene(M₂)을 α,α''-azobisisobutyronitrile을 initiator로 하여 3종류의 용매(dimethyl sulfoxide, ethanol 및 dioxane)중에서 70℃에서 라디칼 공중합시켰다. Kelen-Tudos 법으로 구한 단량체 반응성비는 다음과 같았다. Dimethyl sulfoxide, r₁=0.12, r₂=2.59 ; Ethanol, r₁=0.29, r₂=1.28 ; Dioxane, r₁=1.30, r₂=1.35. 단량체 반응성비에 현저한 용매의 영향이 관찰되었으며, N-methylolacrylamide에 대한 용매의 영향은 amide C=O기와 amide N-H기의 적외선 스펙트럼의 peak의 이동으로부터 확인하였다. 낮은 wavenumber(ν)쪽으로 C=O기의 peak 이동이 클수록 생성된 공중합체중의 N-methylolacrylamide의 함량은 저하되었다. 이상의 결과는 용매의 성질(극성도, 유전상수등)에 의존하는 수소 결합력, 쌍극자-쌍극자 상호작용이 N-methylolacrylamide의 2중 결합의 극성과 반응성에 영향을 미치기 때문인 것으로 생각된다.

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