Treated muscovite reinforced palm oil polyol based shape memory polyurethane
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Date
2016-06
Authors
Nur Fatin Syahidah Khrul Anuar
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Abstract
In this study, a series of treated muscovite reinforced palm oil polyol based shape memory polyurethane with have been successfully synthesized via two- step polymerization. The shape memory polyurethane (SMPU) are composed of polycaprolactonediol (PCL), palm oil polyol (POP), 4,4 diphenylmethane diisocyanate (MDI), and 1,4 betanediol (BD) with molar ratio of 0.8:0.2:6:5. Treated muscovite at different weight percentage of filler which are 1 wt%, 3wt%, and 5% was added to pristine SMPU in order to improve the mechanical properties. The muscovite was treated via two stages process treatment. The first stage involved LiNO3 treatment to allow ion exchange process in which K+ of muscovite were replaced by Li+. In the second stage of treatment which involved cetyltrimethylammonium bromide (CTAB) to intercalate CTA+ within the layers of muscovite. Besides that, the palm oil polyol was added to enhance the crosslinking process and improve the properties of shape memory behaviour. The muscovite treatment has been studied by elemental and morphology analysis, powder X-ray diffraction (XRD), Fourier Transform Infrared Spectrocsopy (FTIR) and scanning electron microscope with energy dispersive x-ray (SEM-EDX). The SEM images showed an increase of interlayer spacing after the treatments. However, after reinforcing the SMPU with treated muscovite, XRD analysis showed a decrease in interlayer spacing and shifting of the peaks to the right which suggest that agglomerations tend to occur with addition of treated muscovite. It is found that 1wt% is the optimum amount of treated muscovite that exhibit good shape memory and mechanical properties in this work.