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Reinforcement of Biodegradable Poly( DL ‐lactic acid) Material by Equal‐Channel Angular Extrusion
Author(s) -
Cui Hongxiang,
Zhang Lianhong,
Gong Jianguo,
Ma Yuchun,
Ying Wang
Publication year - 2006
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200651009
Subject(s) - materials science , extrusion , equal channel angular extrusion , composite material , brittleness , bending , reinforcement , extrusion moulding
The purpose of this study was to reinforce biodegradable poly( DL ‐lactic acid) (PDLLA) material using a new method, equal‐channel angular extrusion (ECAE). Different processing parameters, including the number of extrusion passes and the process temperature, were investigated to analyze their effect on the PDLLA properties. Experimental results indicate that the mechanical strength of PDLLA increased with the number of extrusion passes. The extrusion temperature also affected the mechanical strength of the PDLLA. After two ECAE passes, the bending strength of PDLLA increased from 83.3 to 178.7 MPa. The bending fracture mode for PDLLA changed from brittle failure for initial specimens to ductile fracture after ECAE processing. SEM micrographs showed that the longitudinal split surfaces of PDLLA are of a fibrillar structure. Taken together, the results suggest that ECAE might represent a useful approach for the preparation of reinforced PDLLA.