A study on environmental stress cracking in nano-SiO2-filled polycarbonate
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In this study, the environmental stress cracking (ESC) resistance of nano-SiO2 particle-filled polycarbonate (PC) was investigated at room temperature by using a fracture mechanical test method. Two PC-based nanocomposites with nano-SiO2 content of 1 and 4 vol% were compounded using a twin-screw extruder. The incorporation of nanoparticles into PC leads to an improvement in ESC resistance, which increases with increased filler loading up to 4 vol%. Fractography analyses suggest that the formation of cavities/debonding and localized microdeformation of matrix induced by nanoparticles as a result of energy dissipation are responsible for the improvement of ESC resistance.
KeywordsStress Intensity Factor Crack Opening Displacement Damage Area Crack Propagation Rate Particle Debonding
The authors thank the German Research Foundation for the financial support according to the DFG-graduate Program 814. They are also grateful to Mrs. A. Zeuner, IFOS Kaiserslautern and Mr. K.P. Schmitt, INM Saarbrücken, for the friendly cooperation of experiments. The authors also gratefully acknowledge the cooperation of Mr. V. Demchuk, Polymer Engineering Hamburg, for the support regarding the preparation of the specimens and Bayer MaterialScience as well as Evonik Industries, Germany, for the supply of the materials.
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