Effect of organically modified nanoclay on palm oil polyol based shape memory polyurethane
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Date
2016-06
Authors
Ahmad Izaham Roslan
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Abstract
In this study, shape memory polyurethane (SMPU) was prepared based on palm oil polyol (POP) to reduce the usage of petrochemical based polyol. Besides, nanoclay was added in order to improve the overall properties of the pristine polyurethane. The amount of POP used was up to 20 to 30% while nanoclay were varied 1 to 7 wt%. POP based SMPU was prepared via two-step polymerization process. The effect of nanoclay addition was investigated using thermal analysis, mechanical and shape memory properties. The crystallinity of SMPU decreased with addition of POP while the presence of nanoclay had not affected the crystallinity of SMPU. However, the presence of crystalline structure was still sufficient to exhibit excellent shape fixity up to 30% molar ratio of POP content. Shape fixity of samples reduced significantly at higher clay loading due to the increased phase mixing with addition of clay in polymer matrix. Shape recovery does not achieved 100% recovery however it can be classified as good recovery because it was recovered almost to 100%. The mechanical properties of SMPU were improved and show the optimum values at 3 wt% nanoclay at both molar ratios. It was found that the mechanical properties were changed with addition of more POP content and that the maximum values were obtained at 20% molar ratio POP based SMPU. Based on this study, the SMPU nanocomposites based on 20% POP showed improved thermal, mechanical and shape memory properties compared to pure SMPU.