Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Effects of nucleating agents and plasticizers on the crystallinity and crystal structure of PLA(PolyLactic Acid)

핵제 및 가소제 첨가에 따른 PLA(PolyLactic Acid)의 결정화도 개선 및 결정구조에 관한 연구

  • Received : 2014.12.19
  • Accepted : 2015.01.08
  • Published : 2015.01.31
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Abstract

In this paper, the crystal structure and the crystallinity of PLA(PolyLactic Acid) were studied. PLA is a eco-friendly thermoplastic which completely decomposed by microorganisms, but has low thermal stability and low degree of crystallinity. The low crystallization rate makes the cycle time of injection molding longer and the degree of crystallinity lower. It is a very big disadvantage comparing the other thermoplastics. We improved the degree of crystallinity and the crystallization rate by introducing nucleating agents and plasticizer, and discussed the mechanism.

본 논문에서는 PLA(PolyLactic Acid)의 결정화도 및 결정구조에 대해 연구하였다. PLA는 옥수수 전분으로부터 추출한 Lactic acid로부터 얻어지는 친환경적인 열가소성 플라스틱으로 매립시 미생물에 의해 완전히 분해되는 소재로 각광받고 있지만 열 안정성이 낮고 낮은 결정화도로 인해 높은 기계적 물성이 요구되는 용도에는 부적합한 단점을 가지고 있다. 이 중에서도 낮은 결정화도와 느린 결정화 속도는 사출 성형 공정에서 Cycle time을 증가시키는 요인으로 다른 소재와의 경쟁에 매우 큰 단점으로 나타난다. 본 논문에서는 핵제 및 가소제의 종류와 함량에 따른 결정화도 및 결정화 속도의 변화를 연구함으로써 궁극적으로 사출 성형 공정에서 Cycle time을 개선하고자 하였다.

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References

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