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Oriented morphology and enhanced mechanical properties of poly(L-lactic acid) from shear controlled orientation in injection molding

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Resumo:This study investigates the effect of operative parameters of shear controlled orientation in injection molding (SCORIM) on poly(l-lactic acid), PLLA, and compared with conventional injection molded (CIM) PLLA. The in situ structure developmentwas carried out with systematic variations of mold temperature and shearing time. The energy at break and maximum stress of all the SCORIM processed PLLA are higher than the CIM processed PLLA without sacrificing the modulus. The overall increments in maximum stress and energy at break were 134% and 641%, respectively. Significant enhancements in ductility for the SCORIM processed PLLA are shown to be a consequence of preferential molecular orientation of large fraction of core. The orientation of core is more pronounced at low mold temperature conditions and was increased with increasing shearing time at both the low and high mold temperatures. The processing–morphology and morphology–mechanical property relationships were then established.
Autores principais:Ghosh, Satyabrata
Outros Autores:Viana, J. C.; Reis, R. L.; Mano, J. F.
Assunto:PLLA SCORIM Orientation Fracture surface morphology Energy at break
Ano:2008
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso restrito
Instituição associada:Universidade do Minho
Idioma:inglês
Origem:RepositóriUM - Universidade do Minho

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