Polymer(Korea), Vol.31, No.4, 322-328, July, 2007
단분산된 Polyamide 6(Nylon 6) 미세입자의 제조
Preparation of Mono-dispersed Polyamide 6(Nylon 6) Micro-particle
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초록
촉매인 potassium(K)을 2회 분할 투입하는 음이온 개환중합반응으로 -caprolactam을 분산매인 liquid paraffin 내에서 분산 중합하여 4∼7 m의 직경을 가지는 단분산된 구형의 polyamide 6(Nylon 6) micro-particle를 제조하였다. 융착 방지제의 농도, 촉매의 양, 개시제의 양에 따라 생성된 입자 크기, 형태, 그리고 분포의 변화를 비교 분석하였다. 그 결과 개시제인 PCl3의 양이 단량체의 0.97∼1.17 wt%일 때 약 90.6%의 수율을 얻었으며, 또한 촉매를 1.3∼1.4 wt% 정도로 투입하였을 경우 가장 안정된 구형의 미세입자가 제조되고 높은 수율이 얻어짐을 알 수 있었다.
Mono-dispersed polyamide 6(Nylon 6) micro-particles sized in 4∼5 m diameter were prepared by dispersion polymerization of -caprolactam in liquid paraffin as a dispersion medium. Potassium metal(K) as a catalyst was separately added twice over the anionic ring-opening polymerization of -caprolactam. The size, shape, and size-distribution of prepared particles were varied with the concentration of anti-coagulant as well as the amount of initiator and catalyst. As the initiator concentration was in the range of 0.97∼1.17 wt% in monomer, about 90.6% of yield was accomplished. In addition, the highest yield of well-spherically shaped micro-particles was achieved by adding about 1.3∼1.4 wt% of catalyst.
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