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KMID : 0372919880090010047
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Journal of Biomedical Engineering Research
1988 Volume.9 No. 1 p.47 ~ p.60
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Synthesis and Physical Properties of Hydrophilic Biomedical Polymers-Poly(N-substituted Acrylamide) and its Copolymer-
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Sung Yong-Kiel
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Abstract
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N-n-Propylacrylamide has been synthesized from acrylamide and n-propyl bromide. N -n Propylacrylamide was copolymerized with acrylamide at 60°C in tetrahydrofuran using α, α’’’’ azobisisbutyronitrile as initiator. The synthesized monomer and copolymers have been identified by NMR and FT-lR spectrophotometer. The swelling properties of the crosslinked homopolymers were investigated at different temperatures. Three types of hydration layer around the back-bone structure of gels were determined. The thermal properties of copolymers were also measured by differential scanning calorimeter and thermogravimetry. As the amounts of N-n-propylacrylamide are increased, the enthalpic changes associated with endothermic transition and glass transition of the copolymers are decreased. As the amount of N-n-propylacrylamide is increased, the thermal stability is increased. The activation energies of thermal decomposition and dehydration for the poly (acrylamide-co-N -n-propylacrylamide) have been evaluated by Freeman and Carroll’’’’s method. As the amounts of N-n- propylacrylamide are increased, the activation energies of thermal decomposition and dehydration are increased.
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KEYWORD
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