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Structure and Mechanical Properties of Nanocomposites Based on an Amorphous Copolyester

✍ Scribed by Imanol González; José I. Eguiazábal; Jon Nazábal

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
461 KB
Volume
293
Category
Article
ISSN
1438-7492

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✦ Synopsis

Abstract

Nanocomposites based on an amorphous copolyester (PCTG) were obtained by melt mixing, changing the screw speed and the nature of the surfactant, which differed in polarity and molecular volume. Using Young's modulus as a measure of the dispersion level, a less‐polar nature and a higher molecular volume of the surfactant appeared as positive structural factors for dispersion of the clay in the less‐polar PCTG. The Cloisite 20A, which led to the highest modulus (widest dispersion), was mixed at different contents with PCTG at the observed optimum screw speed (200 rpm). Intercalated structures were observed by WAXD and TEM. The dispersion was wide, as observed by TEM, and led to a large (77%) modulus increase after 7% organoclay addition and to important increases in both tensile yield stress and dimensional stability in creep.

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