The effect of molecular weight and hydrolysis degree of poly(vinyl alcohol)(PVA) on the thermal and mechanical properties of poly(lactic acid)/PVA blends
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2018-06Metadata
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Restrepo, Iván
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The effect of molecular weight and hydrolysis degree of poly(vinyl alcohol)(PVA) on the thermal and mechanical properties of poly(lactic acid)/PVA blends
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Abstract
The effect of molecular weights and hydrolysis degrees (HD) of polyvinyl alcohol (PVA) on thermal and mechanical properties and crystallinity of polylactic acid (PLA)/PVA blends was investigated. Blends were prepared by the melt blending method using PLA/PVA ratios: 80/20, 90/10 and 97/3 wt. %. A single glass transition temperatures was observed for all PLA/PVA blends, suggesting the formation of binary compatible blends at concentration range studied. Thermogravimetric analysis results showed a better thermal stability for PLA/PVA blends containing PVA of higher Mw and HD. According to mechanical properties, low quantities of PVA (3 wt. %) do not affect the tensile strength of blends (irrespective of Mw and HD). However, as the PVA content increases, tensile strength tends to lower values, especially for blends with 20 wt.% of PVA, with 98% of HD.
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Comision Nacional de Investigacion Cientifica y Tecnologica CONICYT (Beca de Doctorado Nacional - Proyecto)
PAI 781411004
CONICYT-REGIONAL
R08C1002
Programa de Financiamiento Basal para Centros Cientificos y Tecnologicos de Excelencia
PFB-27
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Artículo de publicación ISI
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Polímeros-Ciencia e Tecnología Volumen: 28 Número: 2 Páginas: 169-177
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