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Effect of Molding Temperature on the Fracture Toughness of Biodegradable Poly(lactic acid) for Biomaterial  

이덕보 (부경대학교 재료공학부)
Publication Information
Textile Science and Engineering / v.39, no.5, 2002 , pp. 583-588 More about this Journal
Abstract
The aim of this study was to understand the effect of molding temperature on fracture toughness and microstructure of PLA. The fracture toughness( $K_{IC}$) was measured using single-edge-notch bend(SENB) specimens molded at various molding temperatures. The microstructure around a crack tip of PLA was also observed on a polarizing microscope under the cross polarization. The $K_{IC}$ of PLA decreased with increasing molding temperature because spherulite formation at high molding temperatures suppressed craze formation which is one of the toughening mechanism of thermoplastic materials.s.
Keywords
fracture toughness; biodegradable polymer; poly(lactic acid); molding temperature; bio-material;
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