Artículo de revista
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
Fecha
2018-06Registro en:
Polímeros-Ciencia e Tecnología Volumen: 28 Número: 2 Páginas: 169-177
10.1590/0104-1428.03117
Autor
Restrepo, Iván
Medina, Carlos
Meruane Naranjo, Viviana
Akbari Fakhrabadi, A.
Flores, Paulo
Rodríguez Llamazares, Saddys María
Institución
Resumen
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.