POLYMERS AND POLYMER MATRIX COMPOSITES |
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Preparation and Mechanical Performance of Shear Thickening Glue/Polyurethane Foam Composites |
LIU Xiaoke, YU Kejing, QIAN Kun
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Key Laboratory of Eco-Textile of Ministry of Education, Jiangnan University, Wuxi 214122 |
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Abstract The STG/PUF composites were prepared by a one-step method using polyurethane foam (PUF) as the basis of the system, with the presence of polymer shear thickening glue (STG). The influence of isocyanate index (R value) and STG content on microstructure and properties of the resultant STG/PUF composites were investigated. The results showed that the addition of STG enlarges the foam cells and inhibits the foaming process, while nevertheless, improves to a certain extent the composite’s compressive strength as well as remarkably promotes static energy absorption as the STG/PUF sample (R value is 0.75,STG mass fraction is 10%)exhibits an energy absorption capacity of about 12 times larger than that of PUF. In addition, the increasing R value, results in a biphasic (decrease → increase) change of PUF density, and a gradually increasing trend of hardness, but excessive isocyanate content would lead to the foam’s brittleness increment and the mechanical properties deterioration. The foam composite can achieve the optimum mechanical properties when the R value is 0.75 and the mass fraction of STG is 10%.
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Published: 18 October 2018
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