화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.18, No.9, 853-861, September, 2010
DOI10.1007/s13233-010-0912-3  Export Citation
Morphologies and mechanical and thermal properties of highly epoxidized polysiloxane toughened epoxy resin composites
Weiqu Liu1, †, Songqi Ma1, 2, Zhengfang Wang1, 2, Chaohui Hu1, 2, and Chunyi Tang1, 2
  • 1Key Laboratory of Polymer Materials for Electronics, Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou, 510650, China
  • 2Graduate University of Chinese Academy of Sciences, Beijing, 100049, China
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A novel highly epoxidized polysiloxane was synthesized to modify the diglycidyl ether of bisphenol-A (DGEBA). The mechanical and thermal properties as well as the morphology of the cured epoxy resins were examined by tensile testing, impact testing, fracture testing, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and environmental scanning electron microscopy (ESEM). The chemical structure of the highly epoxidized polysiloxane (HEPSO) was confirmed by Fourier transform infrared spectroscopy (FTIR), Si-29 nuclear magnetic resonance spectroscopy (Si-29 NMR), and gel permeation chromatography (GPC). The T (g) increased by approximately 8 A degrees C after introducing HEPSO. TGA in air showed that the initial degradation temperature for 5% weight loss (T (d) 5%), the temperature for 50% weight loss (T (d) 50%) and the residual weight percent at 800 A degrees C (R (800)) were increased after introducing HEPSO. The addition of 4 phr HEPSO2 resulted in the highest increase in tensile strength, impact strength and fracture toughness (K (IC) ). The morphology of the fracture surfaces show that the miscibility of polysiloxane with epoxy resin increased with increasing epoxide group in HEPSO. The high epoxide groups in HEPSO can react during the curing process, and participate chemically in the crosslinking network. HEPSO is expected to improve significantly the toughness and thermal stability of epoxy resin.
Keywords:epoxy;polysiloxane;hydrolysis and condensation;toughness;morphology;thermal properties
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