Abstract
Polyacrylic super absorbent polymer(SAP) containing sorbitol was synthesized by inverse-suspension polymerization method. Sodium acrylate and acrylic acid were used as a monomer, ethylene glycol dimethacrylate(EGDMA) and glycerol polyglycidyl ether(GPGE) were used as a crosslinking agent, potassium persulfate(PPS) was used as an initiator, and cyclohexane was used as a solvent. Content of sorbitol was from 10mol% to 50mol% according to the mol ratio of acrylic acid monomer. The size distribution of the round shaped polymeric particle was $177{\sim}707{\mu}m$. Absorption amount of the polymer containing sorbitol was 785 to 1086 times of the polymer weight in distilled water, was 50 to 83 times in 0.9 % NaCl solution. Absorption and retention amount of the polymer were decreased with increasing the amount of sorbitol, but the polymer has an endothermic property which is +5 cal/g SAP.
역상현탁 중합방법으로 sodium acrylate 및 아크릴산을 모노머로 사용하고 분산제로는 sucrose fatty acid ester(S-570), 증점제로는 Xanthan-gum, 가교제로는 EDGMA 및 GPGE, 개시제로는 $K_2S_2O_8$, 및 용매로는 사이클로헥산을 사용하여, sorbitol의 함유량을 10~50%로 변화시키면서 sorbitol이 결합하고 있는 고흡수성 수지(SAP)를 합성하였다. 합성한 고흡수성 수지를 모노머량의 0.05~0.40mol%로 표면가교 시켰고, 입자형태는 구형이었으며 입자크기 분포는 $177{\sim}707{\mu}m$ 이었다. 고흡수성 수지의 흡수량은 물에 대하여는 785~1086배 이었고, 0.9% NaCl 용액에 대해서는 50~83배 이었다. Sorbitol의 함유랑이 증가할 수록 고흡수성 수지의 흡수량과 보수량은 감소하였으며, +5 cal/g SAP의 흡열특성을 나타내었다.