The degradation of mechanical properties in halloysite nanoclay–polyester nanocomposites exposed to diluted methanol

Saharudin, Mohd, Atif, Rasheed, Shyha, Islam and Inam, Fawad (2016) The degradation of mechanical properties in halloysite nanoclay–polyester nanocomposites exposed to diluted methanol. Journal of Composite Materials, 51 (11). pp. 1653-1664. ISSN 1530-793X

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Official URL: https://doi.org/10.1177/0021998316660178

Abstract

The degradation of mechanical properties in halloysite nanoclay–polyester nanocomposites was studied after an exposure of 24 h in diluted methanol system by clamping test specimens across steel templates. The glass transition temperature (Tg) and storage modulus increased steadily with the increase of halloysite nanoclays before and after diluted methanol exposure. The addition of nano-fillers was found to reduce liquid uptake by 0.6% in case of 1 wt% reinforcement compared to monolithic polyester. The mechanical properties of polyester-based nanocomposites were found to decrease as a result of diluted methanol absorption. After diluted methanol exposure, the maximum microhardness, tensile, flexural and impact toughness values were observed at 1 wt% of halloysite nanoclay. The microhardness increased from 203 to 294 HV (45% increase). The Young’s modulus increased from 0.49 to 0.83 GPa (70% increase) and the tensile strength increased from 23 to 27 MPa (17.4% increase). The impact toughness increased from 0.19 to 0.54 kJ/m2 in diluted methanol system (184% increase). Surprisingly, the fracture toughness of all types of nanocomposites was found to increase after exposing to diluted methanol due to plasticization effect. Scanning electron microscope images of the fractured surfaces of tensile specimens revealed that the methanol increased the ductility of the matrix and reduced the mechanical properties of the nanocomposites.

Item Type: Article
Uncontrolled Keywords: Halloysite nanoclay, polyester, methanol, nanocomposites, mechanical properties
Subjects: F200 Materials Science
H300 Mechanical Engineering
J400 Polymers and Textiles
J500 Materials Technology not otherwise specified
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Fawad Inam
Date Deposited: 19 Jul 2016 09:04
Last Modified: 28 Jun 2017 15:28
URI: http://nrl.northumbria.ac.uk/id/eprint/27311

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