Effect of laminate thickness on moisture diffusion of polymer matrix composites in artificial seawater ageing

doi:10.1007/s11706-012-0177-1

Front Mater Sci

2012, Vol. 6

Issue (3) : 225-235 https://doi.org/10.1007/s11706-012-0177-1

RESEARCH ARTICLE

Effect of laminate thickness on moisture diffusion of polymer matrix composites in artificial seawater ageing

Ratna PAL¹, H. N. NARASIMHA MURTHY¹(

), M. SREEJITH¹, K. R. VISHNU MAHESH², M. KRISHNA¹, S. C. SHARMA³

1. Department of Mechanical Engineering, R. V. College of Engineering, Bangalore-560059, Karnataka, India; 2. Department of P. G. Studies and Research in Industrial Chemistry, Kuvempu University, Shankaraghatta, Shimoga-577451, Karnataka, India; 3. Tumkur University, Tumkur-572103, Karnataka, India

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Abstract

The influence of laminate thickness of polymer matrix composites on moisture diffusion in seawater immersion, as well as the resulting mechanical property degradation for composites of glass/isopolyester (G/IPE), carbon/isopolyester (C/IPE), glass/vinylester (G/VE) and carbon/vinylester (C/VE), was investigated in this paper. Laminates 3 and 10 mm in thickness, fabricated using the wet hand lay-up technique, were characterized for moisture absorption in artificial seawater medium, and their flexural strength and interlaminar shear strength (ILSS) degradations were studied. Moisture diffusion was observed to be anamolous to the Fick’s law for both 3 and 10 mm thick samples in the later stage of diffusion. Moisture permeability of 10 mm thick samples was two to three order greater than that of 3 mm thick ones, while the time to moisture saturation remained unchanged. With the increase of laminate thickness, moisture saturation increased by 1.4% for C/VE and 7% for G/IPE. The residual flexural strength and ILSS were greater in case of 10 mm thick specimens after 200 days of exposure. SEM examination of the fractured specimens showed greater levels of fibre/matrix debonding in 10 mm thick specimens.

Keywords polymer matrix composite diffusion coefficient Fick’s law degradation

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

Issue Date: 05 September 2012

Cite this article:

Ratna PAL,H. N. NARASIMHA MURTHY,M. SREEJITH, et al. Effect of laminate thickness on moisture diffusion of polymer matrix composites in artificial seawater ageing[J]. Front Mater Sci, 2012, 6(3): 225-235.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-012-0177-1
https://academic.hep.com.cn/foms/EN/Y2012/V6/I3/225

Fig.1 Moisture absorption in different polymer composites as a function of duration of immersion in artificial seawater: samples 3 mm in thickness; samples 10 mm in thickness.

Tab.1 Moisture diffusion parameters of polymer composites

Fig.2 Moisture diffusivity of polymer composites.

Fig.3 Moisture permeability of polymer composites.

Fig.4 Moisture absorption behaviors based on experimental data and the Fick’s law for 3 and 10 mm thick specimens: G/IPE; C/IPE; G/VE; C/VE.

Tab.2 Rate of diffusion in three stages of moisture absorption in the composites

Fig.5 Flexural strength of composites 3 mm in thickness and 10 mm in thickness.

Fig.6 ILSS degradation of composites 3 mm in thickness and 10 mm in thickness.

Fig.7 SEM images of G/IPE: 3 mm in thickness, under dry condition, 500×; 3 mm in thickness, after 200 days of immersion, 500×; 10 mm in thickness, under dry condition, 1000×; 10 mm in thickness, after 200 days of immersion, 500×.

Fig.8 SEM images of C/IPE: 3 mm in thickness, under dry condition, 500×; 3 mm in thickness, after 200 days of immersion, 500×; 10 mm in thickness, under dry condition, 50×; 10 mm in thickness, after 200 days of immersion, 500×.

Fig.9 SEM images of G/VE: 3 mm in thickness, under dry condition, 500×; 3 mm in thickness, after 200 days of immersion, 500×; 10 mm in thickness, under dry condition, 500×; 10 mm in thickness, after 200 days of immersion, 1000×.

Fig.10 SEM images of C/VE: 3 mm in thickness, under dry condition, 500×; 3 mm in thickness, after 200 days of immersion, 500×; 10 mm in thickness, under dry condition, 500×; 10 mm in thickness, after 200 days of immersion, 500×.

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