Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Modification of PLA/PBAT Blends and Thermal/Mechanical Properties

PLA/PBAT 블렌드의 개질과 열적, 기계적 특성

  • Kim, Dae-Jin (Leaders in Industry-University Cooperation Foundation, Kyungpook National University) ;
  • Min, Chul-Hee (Department of Polymer Science & Engineering, Kyungpook National University) ;
  • Park, Hae-Youn (Department of Polymer Science & Engineering, Kyungpook National University) ;
  • Kim, Sang-Gu (R&D Center, Woosung Chemical Ltd.) ;
  • Seo, Kwan-Ho (Department of Polymer Science & Engineering, Kyungpook National University)
  • 김대진 (경북대학교 산학협력선도대학사업단) ;
  • 민철희 (경북대학교 고분자공학과) ;
  • 박해윤 (경북대학교 고분자공학과) ;
  • 김상구 ((주)우성케미칼 연구소) ;
  • 서관호 (경북대학교 고분자공학과)
  • Published : 2013.02.10
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Abstract

Poymer blends of two degradable aliphatic polyesters, relatively expensive material polylactic acid (PLA) and relatively inexpensive material poly(butylene adipate-co-terephthalate) (PBAT), were used in this study. Three different kinds of modifiers were used with various amounts. Diisocyanate type methylenediphenyl 4,4'-diisocyanate (MDI) and hexamethylene diisocyanate (HDI) were used as modifiers and epoxy type coupling agents also used. The melt flow index (MFI) and dynamic viscoelasticity of various compositions of PLA/PBAT blends were studied. The mechanical property and morphology with respect to the fracture surface of PLA/PBAT blends were also investigated using tensile test and field emission scanning electronic microscopy, respectively. These tests were also used to verify the compatibility of PLA/PBAT and the effect of mechanical properties due to the use of modifiers. Tensile properties of PLA/PBAT blends modified with HDI were improved remarkably.

본 연구에서는 생분해성 지방족 폴리에스터 중 비교적 고가인 poly(butylene adipate-co-terephthalate) (PBAT)와 상대적으로 저가의 생분해성 고분자인 polylactic acid (PLA)의 블렌드에 3종류의 개질제를 사용하여 그 효과를 조사하였다. 개질제로는 에폭시계의 커플링제와 diisocyanate계열의 methylenediphenyl 4,4'-diisocyanate (MDI)와 hexamethylene diisocyanate (HDI)를 사용하였다. 여러 가지 조성의 블렌드에 용융흐름지수, 동적 점탄성을 조사하였다. 또한, 인장시험을 통한 기계적 물성 조사와 FE-SEM으로 시편의 파단표면을 관찰하였다. 이를 통해 PLA/PBAT 블렌드의 상용성과 개질제의 효과 및 기계적물성에 미치는 영향을 고찰하였다. 개질제로 HDI를 사용했을 때 PLA/PBAT의 인장물성이 크게 증가하였다.

Keywords

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