Calcium bentonite as reinforcing nanofiller for thermoplastic starch

Journal of the Brazilian Chemical Society

Magalhães, Natália F.¹  Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil¹  Andrade, Cristina T.¹ 

关键词: thermoplastic starch;    calcium bentonite;    hybrids;    aging;    mechanical properties;   

DOI  :  10.1590/S0103-50532010000200003

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

Glycerol-plasticized corn starch materials (TPS), reinforced with calcium bentonite, were prepared by melt extrusion. Scanning electron microscopy was used to visualize extrudates morphology. The effects of clay content and of glycerol content on physical properties of extrudates were evaluated. As determined by X-ray diffraction, the increase in glycerol content led to materials with higher B-type crystallinity. Addition of clay resulted in hybrid materials with improved properties in relation to TPS alone, even after conditioning at a high relative humidity for 90 days. X-Ray diffraction was also used to evaluate clay intercalation within the polymeric matrix, before and after conditioning. Results from tensile tests suggested a high degree of exfoliation.

【 授权许可】

Unknown