PLA/셀룰로오스 나노크리스탈 나노복합재의 물성

강호민; 신용화; 김대수; Homin Kang; Yonghwa Shin; Dae Su Kim

Polymer(Korea), Vol.42, No.4, 649-653, July, 2018

DOI10.7317/pk.2018.42.4.649 Export Citation

PLA/셀룰로오스 나노크리스탈 나노복합재의 물성

Physical Properties of Poly(lactic acid)/Cellulose Nanocrystal Nanocomposites

강호민, 신용화, 김대수 ^†

충북대학교 공과대학 화학공학과

Homin Kang, Yonghwa Shin, and Dae Su Kim^†

Department of Chemical Engineering, Chungbuk National University, 1 Chungdaero, Seowongu, Cheongju, Chungbuk 28644, Korea

E-mail:

초록

PLA는 친환경 생분해성 플라스틱으로 식품용 포장재 및 3D 프린트용 필라멘트로 주로 사용되고 있다. 본 연구에서는 친환경 천연 충전재인 셀룰로오스 나노크리스탈(CNC)을 PLA에 충전한 복합재의 물성을 조사하였다. PLA/CNC 나노복합재는 용융혼합 및 압축성형에 의해 제조하였다. CNC의 함량에 따른 PLA/CNC 나노복합재들의 인장특성, 충격강도 및 열적 특성을 각각 측정하였다. CNC의 함량이 늘어날수록 나노복합재의 결정화도, 인장 강도 및 인장 탄성률은 증가하였지만 유리전이온도, 냉각결정화 시작 온도 및 파단 신율은 감소하였다. 충격강도는 CNC1 phr일 때 가장 높았다.

Polylactic acid (PLA) is an eco-friendly biodegradable plastic and mainly used as food packaging materials and 3D printing filaments. In this study, the physical properties of PLA composites filled with cellulose nanocrystal (CNC), an environmentally friendly natural filler, were investigated. The PLA/CNC nanocomposites were prepared by melt mixing and compression molding. The tensile properties, impact strengths and thermal properties of the PLA/ CNC nanocomposites with different CNC content were measured. As the content of CNC increased, the crystallinity, tensile strength and tensile modulus of the nanocomposites increased, but the glass transition temperature, cold crystallization beginning temperature and elongation at break decreased. Impact strength was the highest at the CNC content of 1 phr.

Keywords:poly(lactic acid);cellulose nanocrystal;nanocomposites;physical properties

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