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Polymers 2016, 8(5), 202; doi:10.3390/polym8050202

Quasi-Static Behavior of Palm-Based Elastomeric Polyurethane: For Strengthening Application of Structures under Impulsive Loadings

1
Department of Civil and Structural Engineering, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Malaysia
2
Department of Architecture, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Malaysia
3
School of Chemical Sciences and Food Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Malaysia
4
School of Civil Engineering, The University of Sydney, 2006 New South Wales, Australia
5
Department of Information Systems, University of Malaya, 50603 Kuala Lumpur, Malaysia
*
Author to whom correspondence should be addressed.
Academic Editors: Alper Ilki and Masoud Motavalli
Received: 31 March 2016 / Revised: 9 May 2016 / Accepted: 10 May 2016 / Published: 20 May 2016
(This article belongs to the Special Issue Selected Papers from “SMAR 2015”)
View Full-Text   |   Download PDF [7349 KB, uploaded 20 May 2016]   |  

Abstract

In recent years, attention has been focused on elastomeric polymers as a potential retrofitting material considering their capability in contributing towards the impact resistance of various structural elements. A comprehensive understanding of the behavior and the morphology of this material are essential to propose an effective and feasible alternative to existing structural strengthening and retrofitting materials. This article presents the findings obtained from a series of experimental investigations to characterize the physical, mechanical, chemical and thermal behavior of eight types of palm-based polyurethane (PU) elastomers, which were synthesized from the reaction between palm kernel oil-based monoester polyol (PKO-p) and 4,4-diphenylmethane diisocyanate (MDI) with polyethylene glycol (PEG) as the plasticizer via pre-polymerization. Fourier transform infrared (FT-IR) spectroscopy analysis was conducted to examine the functional groups in PU systems. Mechanical and physical behavior was studied with focus on elongation, stresses, modulus, energy absorption and dissipation, and load dispersion capacities by conducting hardness, tensile, flexural, Izod impact, and differential scanning calorimetry tests. Experimental results suggest that the palm-based PU has positive effects as a strengthening and retrofitting material against dynamic impulsive loadings both in terms of energy absorption and dissipation, and load dispersion. In addition, among all PUs with different plasticizer contents, PU2 to PU8 (which contain 2% to 8% (w/w) PEG with respect to PKO-p content) show the best correlation with mechanical response under quasi-static conditions focusing on energy absorption and dissipation and load dispersion characteristics. View Full-Text
Keywords: palm-based polyurethane; elastomer; impulsive loadings; quasi-static; retrofitting; strengthening palm-based polyurethane; elastomer; impulsive loadings; quasi-static; retrofitting; strengthening
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Somarathna, H.M.C.C.; Raman, S.N.; Badri, K.H.; Mutalib, A.A.; Mohotti, D.; Ravana, S.D. Quasi-Static Behavior of Palm-Based Elastomeric Polyurethane: For Strengthening Application of Structures under Impulsive Loadings. Polymers 2016, 8, 202.

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