Article
  • Miscibility behavior of Biodegradable Poly(hydroxyalkanoate) with EVA
  • Lee HS, Lee JS, Yoon JS, Choi HJ, Choi SJ
  • 생분해성 고분자인 Poly(hydroxyalkanoate)와 EVA의 상용성
  • 이한섭, 이종서, 윤진산, 최형진, 최순자
Abstract
Miscibility behavior between poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHB-HV) copolymer with poly(ethylene vinylacetate) (EVA) has been studied with differential scanning calorimetry(DSC), rheovibron and polarizing microscopy. Whereas the enthalpy of fusion of PHB and PHB-HV of blend samples has been observed as a decreasing function with the increase of EVA content, that of EVA remained almost constant with the blend compositions. The melting temperature of the PHA component was not affected by the blend composition. However the crystallization temperature of PHA observed during cooling period decreased with the increase of EVA content. From these results, it was concluded that the miscibility of PHA with EVA at room temperature is poor. But these blend samples have increased compatibility at the molten state. The domain structure of phase separated state has been observed with the polarizing microscopy and the glass transition temperatures of each domain have been measured with a rheovibron.

생분해성 고분자의 일종인 poly(hydroxyalkanoate)(PHA)[poly(3-hydroxybutyrate)(PHB) 및 poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHB-HV)]와 poly(ethylene vinylacetate) (EVA)와의 상용성을 시차주사열량분석기(DSC), rheovibron, 편광 현미경을 사용하여 조사하였다. 온도를 승온 시키면서 관찰한 PHB, PHB-HV의 용융 엔탈피는 EVA 함량이 증가할수록 감소하는 경향을 나타내나 EVA의 용융 엔탈피는 PHB, PHB-HV 함량에 무관하게 거의 변화가 없음을 관찰하였다. 또한 온도를 승온 시키면서 관찰한 용융 온도(Tm)도 각 블랜드 함량에 무관하게 변화를 보이지 않았다. 그러나 냉각시키면서 관찰한 PHB의 결정화 온도(Tc)는 EVA함량이 증가함에 따라서 점차 감소하는 경향을 보이고 있다. 따라서 상온에서는 고분자간의 강호작용이 크지 않으나 용융 상태에서는 약간의 상호작용이 증가함을 관찰하였다. Rheovibron으로 dynamic mechanical properties를 측정하여 각 domain의 Tg가 나타남을 관찰하였다. 편광 현미경으로 각각의 domain이 상분리 되어있음을 확인하였으며 주 domain안에도 다른 domain이 포함되어 있음을 관찰할 수 있었다.

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1994; 18(3): 358-367

    Published online May 25, 1994