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

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Preparation of MA-PLA Using Radical Initiator and Miscibility Improvement of PLA/PA11 Blends

라디칼 개시제를 이용한 MA-PLA 제조 및 바이오플라스틱 PLA/PA11 블렌드의 상용성 개선

  • Lee, Jong-Eun (Department of Applied Chemical Engineering, School of Energy.Materials.Chemical Engineering, Korea University of Technology and Education) ;
  • Kim, Han-Eol (Department of Applied Chemical Engineering, School of Energy.Materials.Chemical Engineering, Korea University of Technology and Education) ;
  • Nam, Byeong-Uk (Department of Applied Chemical Engineering, School of Energy.Materials.Chemical Engineering, Korea University of Technology and Education)
  • 이종은 (한국기술교육대학교 에너지.신소재.화학공학부 응용화학공학과) ;
  • 김한얼 (한국기술교육대학교 에너지.신소재.화학공학부 응용화학공학과) ;
  • 남병욱 (한국기술교육대학교 에너지.신소재.화학공학부 응용화학공학과)
  • Received : 2019.01.30
  • Accepted : 2019.04.05
  • Published : 2019.04.30
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Abstract

Recently, various investigation of vegetable oil which is extracted from natural resources is being progressed because of its low cost and environmental aspect. However, double bonds in vegetable oil should be substituted to other high reactive functional group due to its low reactivity for synthesizing bio-polymeric materials. ${\alpha}$-eleostearic acid, which is consist of conjugated triene, is the main component of tung oil, and the conjugated triene allows tung oil to have higher reactivity than other vegetable oil. In this study, tung oil is copolymerized with styrene and divinylbenzene to make thermoset resin without any substitution of functional group. Thermal and mechanical properties are measured to investigate the effects of the composition of each monomer on the synthesized thermoset resin. The result shows that the products have only one Tg, which means the synthesized thermoset resins are homogeneous in molecular level. Mechanical properties show that tung oil act as soft segment in the copolymer and make more elastic product. On the other hand, divinylbenzene acts as hard segment and makes more brittle product.

Vegetable oil은 자연 유래 물질로 낮은 가격 및 친환경적이라는 장점으로 최근 다양한 연구가 진행되고 있다. 하지만 vegetable oil 내의 이중결합의 낮은 반응성으로 인해 고분자 합성의 기반 물질로 사용하기 위해서는 반응성이 높은 관능기로 치환하여 사용하는 경우가 많다. Tung oil은 ${\alpha}$-eleostearic acid를 주성분으로 하는데, 이 구조는 3개의 이중결합이 공명구조 형태로 되어있기 때문에 다른 vegetable oil과는 달리 높은 반응성을 보인다. 본 연구에서는 이러한 tung oil을 styrene 및 divinylbenzene 등의 monomer와 양이온 중합을 통해 tung oil의 관능기 치환 과정이 없는 열경화성 수지를 합성하였으며, 각 monomer의 조성이 합성된 열경화성 수지에 미치는 영향을 확인하기 위해 열적 기계적 물성을 측정하였다. 그 결과, tung oil-styrene-divinybenzene copolymer는 단일 Tg를 갖는 homogeneous한 열경화성 고분자를 형성하는 것을 확인하였으며, 기계적 물성의 변화를 통해 tung oil 및 styrene은 soft segment로써 합성된 copolymer에 elastic한 성질을 부여하고, divinylbenzene은 hard segment로 작용하여 합성된 copolymer에 brittle한 성질을 부여하는 것을 확인하였다.

Keywords

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Fig. 1. 1H-NMR spectra of (A) PLA and (B)MA-g-PLA.

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Fig. 2. Grafting yield and Melt Index results depending on radical initiator (PK14) and maleic anhydride (MA) content.

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Fig. 3. Melt Index variation depending on compatibilizer content of PLA / PA11 blends.

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Fig. 4. Impact strength results of PLA and PA11 blends with 2, 5, 10 phr of Compatibilizer(X01M1).

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Fig. 5. (a) Flexural Modulus and (b) Tensile Strength results of PLA/PA11 blends.

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Fig. 6. Characteristics of PLA/PA11 75/25 blends with three types of compatibilizers; (a) Metl Index and (b) Impact Strength.

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Fig. 8. FE-SEM images of PLA/PA11/compatibilizerblends; (A) 25/75, (B) 75/25, (a) 0 phr, (b) 2phr, (c) 5 phr, (d) 10 phr of compatibilizer(X01M1) content.

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Fig. 7. (a) Impact Strength and (b) Flexural Modulus results of PLA/PA11/X01M1 75/25/5 blends reinforced by three types of impact modifiers.

Table 1. Compositions for MA-g-PLA Prepared by Radical Initiator and Modifier

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Table 2. Formulations of PLA and PA11 Blends with Compatibilizer (X01M1) Content

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Table 3. Formulations of PLA/PA11 (75/25) Blends by Three Types of Compatibilizers with 5 phr Fixed Content

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Table 4. Formulations of PLA/PA11/X01M1 (75/25/5) Blends Incorporated with Three Types of Impact Modifiers with 10 phr Fixed Content

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