Mechanical behavior of organo-modified Indian bentonite nanoclay fiber-reinforced plastic nanocomposites

doi:10.1007/s11706-013-0224-6

Front Mater Sci

2013, Vol. 7

Issue (4) : 396-404 https://doi.org/10.1007/s11706-013-0224-6

RESEARCH ARTICLE

Mechanical behavior of organo-modified Indian bentonite nanoclay fiber-reinforced plastic nanocomposites

N. RAGHAVENDRA¹, H. N. NARASIMHA MURTHY²(

), M. KRISHNA², K. R. VISHNU MAHESH³, R. SRIDHAR², S. FIRDOSH², G. ANGADI², S. C. SHARMA⁴

1. Center for Manufacturing and Research Technology Utilization, R. V. College Campus, Bangalore 560059, Karnataka, India; 2. Department of Mechanical Engineering, R. V. College of Engineering, Bangalore 560059, Karnataka, India; 3. Department of Chemistry, ACS College of Engineering, Bangalore 560074, Karnataka, India; 4. Tumkur University, Tumkur 572103, Karnataka, India

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Abstract

The aim of the research was to examine the influence of organo-modified Indian bentonite (IB) nanoclay dispersed in vinylester on the mechanical properties of nanoclay/vinylester/glass nanocomposites. Nanoclay was organically modified using cationic surfactant hexadecyltrimethylammonium bromide (HDTMA--Br) by cation exchange method and dispersed in vinylester using ultrasonication and twin screw extrusion. XRD of nanoclay/vinylester revealed exfoliation at 4 wt.% nanoclay indicating uniform dispersion in the polymer. DSC results showed improvement in glass transition temperature by 22.3% in 4 wt.% nanoclay/vinylester/glass when compared with that of vinylester/glass. Nanoclay/vinylester/glass with 4 wt.% nanoclay showed 29.23%, 23.84% and 60.87% improvement in ultimate tensile strength (UTS), flexural strength (FS) and interlaminar shear strength (ILSS) respectively when compared with those of vinylester/glass. The mode of tensile failure examined by SEM showed no agglomeration of nanoclay in 4 wt.% nanoclay/vinylester/glass specimens.

Keywords Indian bentonite (IB) ultrasonication twin-screw extrusion mechanical property

Corresponding Author(s): NARASIMHA MURTHY H. N.,Email:hnmdatta@yahoo.com

Issue Date: 05 December 2013

Cite this article:

N. RAGHAVENDRA,H. N. NARASIMHA MURTHY,M. KRISHNA, et al. Mechanical behavior of organo-modified Indian bentonite nanoclay fiber-reinforced plastic nanocomposites[J]. Front Mater Sci, 2013, 7(4): 396-404.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-013-0224-6
https://academic.hep.com.cn/foms/EN/Y2013/V7/I4/396

Fig.1 Schematic representation of dispersion of nanoclay in vinylester.

Tab.1 Specifications of materials used in the research

Tab.2 Specifications of ultrasonicator

Fig.2 Configuration of screw elements adopted for dispersion.

Tab.3 Specifications of co-rotating twin-screw extruder

Fig.3 XRD patterns of IB specimens: IB clay (a), 2 wt.% IB/vinylester (b), 3 wt.% IB/vinylester (c), 4 wt.% IB/vinylester (d), and 5 wt.% IB/vinylester (e).

Fig.4 SEM images of fractured surfaces of 1 wt.% IB/vinylester/glass, 2 wt.% IB/vinylester/glass, 3 wt.% IB/vinylester/glass, 4 wt.% IB/vinylester/glass, and 5 wt.% IB/vinylester/glass.

Fig.5 DSC thermograms of vinylester (a), 2 wt.% IB/vinylester/glass (b), 3 wt.% IB/vinylester/glass (c), 4 wt.% IB/vinylester/glass (d), and 5 wt.% IB/vinylester/glass (e).

Tab.4 Glass transition temperatrure of IB/vinylester/glass based nanocomposites

Fig.6 Effect of IB (wt.%) addition to vinylester/glass on mechanical properties: UTS; FS; ILSS.

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