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KMID : 0372919870080010029
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Journal of Biomedical Engineering Research
1987 Volume.8 No. 1 p.29 ~ p.39
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Copolymerization of 2-Hydroxyethyl Methacrylate with Functional Silane Monomers
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Abstract
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2-Hydroxyethyl methacrylate(HEMA) was copolymerized with allyltrimethylsilane- (ATMS) and allylt.imethoxysilane(ATMOS) at 70。C in N, N’’’’dimethylformamide- (DMV) using α , α’’’’-azobisisobutyronitrile(AIBN). The compositions of unreacted monomers were determined by gas chromatographic analysis. The monomer reactivity ratios were determined by Fireman-Ross, Helen-Tiidus and intersection methods. The average values are as follows : r1(HEMA) : 6.62 ± 0.07, r2(ATMS) : 0.07 ± 0.01 for HEMA-ATMS system. rl(HEMA) : 4.09 ± 0.14, r2(ATMOS) : 0.06 ± 0.01 for HEMA-ATMOS toys tem. The lower rl(HEMA) In the HEMA-ATMOS system as compared to HEMA ATMS system may be contributed to higher relative reactivity of ATMOS toward the poly(HEMA) radical. The compositions of synthesized copolymers were determined from silicon con tents estimated gravimetrically. The thermal stabilities of the copolymers were investigated by thermogravimetry(TG). The enthalpic changes associated with the endothermic transition were evaluated by differential scanning calorimetry(DSC). The swelling properties of the copolymers in water were also investigated.
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