Note
  • The Effect of Cellulose Surface Treatment on the Fracture Toughness of Microfibrillated Cellulose Reinforced Unsaturated Polyester Composites
  • Yeo JS, Kim OY, Lee SW, Hwang SH
  • 미세섬유상 셀룰로오스에 의해 보강된 불포화 폴리에스터 복합재의 파괴인성 특성:셀룰로오스 표면개질 효과
  • 여준석, 김오영, 이상원, 황석호
Abstract
As a reinforcing filler of unsaturated polyester resin (UPR), the surface modification of microfibrillated celluloses (MFCs) was conducted with allyltrimethoxy silane (VPS) to increase interfacial adhesion between filler and UPR matrix. The surface modification reaction of the pristine MFCs was confirmed by FTIR, XPS and SEM/EDX. Two different UPR composites were prepared by the pristine MFCs and VPS-MFCs, respectively for comparing their fracture toughness and mechanical properties. The results of tensile and impact properties for the UPR composites showed the better performance of VPSMFC/UPR composites than of the pristine MFC/UPR composites. Indeed, the results of the critical stress intensity factor (KIC) and the critical strain energy release rate (GIC) pointed out the improved interfacial adhesion between UPR matrix and cellulosic filler in the VPS-MFC/UPR composites, which induced their enhanced fracture toughness.

본 연구에서는 불포화 폴리에스터 수지(UPR) 복합재의 보강재로서, 미세섬유상 셀룰로오스(MFC)를 allyltrimethoxy silane(VPS)으로 표면개질을 통하여 보강재와 기재간 계면접착력을 향상시켰다. 개질된 미세섬유상 셀룰로오스(VPS-MFC)는 FTIR, XPS 그리고 SEM/EDX를 이용하여 표면 개질반응을 확인하였다. 개질 전 미세섬유상 셀룰로오스를 첨가한 UPR 복합재를 대조군으로 제조하고 미세섬유상 셀룰로오스 함량에 따른 불포화 폴리에스터 수지의 기계적 물성과 파괴인성 변화를 고찰였다. VPS-MFC/UPR 복합재의 인장 및 충격특성은 개질 전 MFC/UPR 복합재보다 향상된 결과를 보여주었다. 또한 VPS-MFC/UPR 복합재의 임계응력 세기인자(KIC) 및 임계변형 속도에너지(GIC) 값은 복합재 내에서 보강재와 기재간의 향상된 계면접착력을 의미하며 높은 파괴인성 특성을 보여주었다.

Keywords: cellulose; chemical modification; unsaturated polyester; composites; fracture toughness

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This Article

  • 2017; 41(1): 157-162

    Published online Jan 25, 2017

  • 10.7317/pk.2017.41.1.157
  • Received on Oct 2, 2016
  • Accepted on Nov 7, 2016