마이크로파 박리공정에 의한 비작용기화 그래핀 및 폴리프로필렌 카보네이트 기반의 나노 복합물질

오혁균; 김성우; Hyeok Gyun Oh; Seong Woo Kim

Polymer(Korea), Vol.41, No.5, 820-826, September, 2017

DOI10.7317/pk.2017.41.5.820 Export Citation

마이크로파 박리공정에 의한 비작용기화 그래핀 및 폴리프로필렌 카보네이트 기반의 나노 복합물질

Poly(propylene carbonate) Nanocomposites Incorporating Non-functionalized Graphene Nanosheets Prepared by Microwave-assisted Exfoliation Process

오혁균, 김성우 ^†

경기대학교 화학공학과

Hyeok Gyun Oh, and Seong Woo Kim^†

Department of Chemical Engineering, Kyonggi University, 154-42 Gwanggyosan-ro, Yeongton-gu, Suwon 16227, Korea

E-mail:

초록

비작용기화 그래핀 나노 판상체(non-functionalized graphene nanosheets, NFGNs)와 생분해성 폴리프로필렌카보네이트(PPC) 수지를 용액 블렌딩 공정을 이용하여 혼합함으로써 제반 물성 및 차단 특성이 향상된 나노 복합필름을 제조하였다. 그래파이트에 마이크로파를 조사하여 팽창시킨 이후 연속적으로 초음파 분산공정을 이용하여 층간 간격이 증가된 삽입 및 박리 구조를 갖는 NFGNs를 얻었다. 다양한 함량의 NFGNs를 함유한 나노 복합필름의 유리전이온도, 인장 물성 및 산소투과율을 측정하였으며, 이로부터 NFGNs 첨가가 PPC 수지의 열적, 기계적 성질및 가스 차단 성능의 향상에 미치는 영향을 조사하였다. NFGNs를 1.0 wt% 이하의 적은 함량으로 첨가하여도 열적,기계적 성질 및 차단 특성이 매우 뚜렷하게 향상된 것으로 나타났다. NFGNs를 혼합한 나노 복합필름의 투명성은광 산란의 증가로 인하여 순수 PPC 필름에 비해 감소하였으나, 0.3 wt% 함량으로 혼합한 경우에는 광투과율 80% 정도의 비교적 우수한 투명성을 나타냈다.

Biodegradable poly(propylene carbonate) (PPC)-based nanocomposite films with enhanced physical and barrier properties were prepared by incorporating non-functionalized graphene nanosheets (NFGNs) via solution blending. The highly intercalated and exfoliated NFGNs were successfully obtained by employing microwave irradiation-assisted exfoliation method, followed by sonication. The thermal and mechanical reinforcement and gas barrier effects arising from incorporation of NFGNs into PPC were investigated in terms of measurements of glass transition temperature, tensile properties, and oxygen transmission rate for the resultant nanocomposite films with various loadings. The remarkable improvement in the thermal, mechanical, and barrier properties was achieved by the incorporation of only small amounts of NFGNs below 1.0 wt%. The incorporation of NFGNs decreased the optical transparency of the film because of increased light scattering, but 0.3 wt% NFGNs loading gave rise to fairly good transparency with a light transmission of around 80%.

Keywords:poly(propylene carbonate);non-functionalized graphene nanosheets;microwave irradiation;nanocomposite film

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