Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Effect of Thermal History on the Physical Properties of Nylon66

열 이력이 나일론66의 물성에 미치는 영향

  • Lee, Bom Yi (Major in Polymer Science and Engineering, Kongju National University) ;
  • Jo, Chan Woo (Major in Polymer Science and Engineering, Kongju National University) ;
  • Shim, Chang Up (Technical Research Center, ENA Industry) ;
  • Lim, Su Jung (Technical Research Center, ENA Industry) ;
  • Kim, Youn Cheol (Major in Polymer Science and Engineering, Kongju National University)
  • 이봄이 (공주대학교 신소재공학부 고분자공학전공) ;
  • 조찬우 (공주대학교 신소재공학부 고분자공학전공) ;
  • 심창업 (공주대학교 산학협력단 에나인더스트리 기술연구소) ;
  • 임수정 (공주대학교 산학협력단 에나인더스트리 기술연구소) ;
  • 김연철 (공주대학교 신소재공학부 고분자공학전공)
  • Received : 2013.11.14
  • Accepted : 2013.12.20
  • Published : 2014.02.10
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Abstract

Nylon66 extrudates as a function of the extrusion number were prepared by a twin screw extruder. Chemical structures, thermal properties, melt index, crystal structures, mechanical properties such as the tensile strength, elongation at break and impact strength, and rheological property were measured by FT-IR, $^1H$-NMR, melt indexer, DSC, TGA, XRD, universal tensile tester, Izod impact tester, and rheometer. FT-IR and $^1H$-NMR characterizations indicated that the number of extrusions did not affect the chemical structure. The decrease in the molecular weight was checked by the melt index of extrudates. There were no effects of the thermal history on the melting and degradation temperature. The tensile and impact strength and modulus were found to be similar, regardless of the number of extrusions, but the elongation decreased significantly. The complex viscosity of extrudates at low frequencies decreased with the extrusion number. No structural changes after extrusion were confirmed from the fact that there was no change in the slope and shape of G'-G" plot.

이축압출기(twin screw extruder)를 이용하여 나일론66 압출시료를 압출횟수에 따라 제조하였다. 압출횟수에 따른 화학구조, 열적 특성, 용융지수, 결정구조, 인장특성, 충격특성 및 유변학적 특성을 FT-IR, $^1H$-NMR 용융지수 측정기, DSC, TGA, XRD, 만능시험기, Izod 시험기, 그리고 유변물성측정기를 이용하여 분석하였다. FT-IR과 $^1H$-NMR을 이용하여 확인한 결과 압출시편에서의 화학구조 변화는 확인되지 않았다. 압출횟수에 따라 분자량이 감소하는 것을 용융지수를 이용하여 확인하였으며, 열 이력이 용융온도와 분해온도에는 큰 영향을 주지 않는 것을 DSC와 TGA를 이용하여 확인하였다. 압출시편의 기계적 특성 평가결과 인장강도, 충격강도 및 탄성률은 유사한 값을 보이나, 신율의 경우 큰 폭으로 감소하였다. 유변학적 특성 측정결과 낮은 주파수에서의 복합점도 값이 압출 횟수에 따라 감소하였다. 압출시편의 G'-G" 곡선의 기울기나 형태가 변하지 않는 것으로부터 압출시편에 가교와 같은 구조변화가 크게 나타나지 않음을 알 수 있었다.

Keywords

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