| Cross-linked Copolymer gels were successfully prepared by copolymerization of long alkyl chain acrylic ester (hexadecyl acrylate(HA), octadecyl acrylate(ODA),) and hydrophilic monomer (acrylic acid(AA), methacrylic acid(MAA), 2-hydroxy-ethyl ester(HEA)) , using absolute ethanol as a solvent, N,N' -methylene-bis-acrylamide (MBAA) as a cross-linking agent at 50@. The effects of composition of monomers on the properties of the gels were studied.1 It was found that the polymer gels with HA:AA=1:1 (molar ratio); HA:HEA=1:1 (molar ratio); HA:MAA=1:1 (molar ratio); ODA:HEA=l:2(molar ratio); ODA:MAA=l:3(molar ratio) exhibited a higher ordered structure and higher degree of swelling in dimethylsulfoxide (DMSO).2 The effect of polarity of solvent on the ordered structure of the gels was also investigated, using the mixture of cyclohexanol (dielectric constant =15 at 25 ℃) and DMSO(dielectric constant = 48.9 at 20℃).3 The gels showed transformation of the structure from order to disorder with the change of temperature by the characteristic of differential scanning calorimetry (DSC). The effects of composition of monomers on the properties of the gels were studied.
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