A Study on Structure and Mechanical Properties of Polyurethane/Organic-Montmorillonite Nanocomposites |
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| Authors: | Shishan Wu Aimin Cheng Hongyan Hua Jian Shen |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Nanjing University , Nanjing, P. R. China shishanwu@yahoo.com.cn;3. School of Chemistry and Chemical Engineering, Nanjing University , Nanjing, P. R. China;4. School of Chemistry and Chemical Engineering, Nanjing University , Nanjing, P. R. China;5. College of Chemistry and Environment Science , Nanjing Normal University , Nanjing, P. R. China |
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| Abstract: | The intercalated nanocomposites of polyurethane (PU) with organic-montmorillonite (OMMT) treated by cetryltrimethyl ammonium bromide was prepared. The interlayer spacing of PU/OMMT nanocomposites was 3–4 nm. The interface interaction of PU/OMMT nanocomposites was improved compared to that of PU/montmorillonite (MMT) composites. The orderly arrangement of the PU chains was hindered because of strong interface interaction between the silicate layers dispersed in the nanometer and PU chains. By adding 2 wt% OMMT to PU, tensile strength and tear strength of the PU/OMMT composites were increased from 10.5 MPa and 36.4 KN/m to 13.8 MPa and 42.2 KN/m, respectively. The tensile strength and tear strength increased with OMMT content firstly, reaching its maximum when the OMMT content was 8 wt%. After that, the tensile strength and tear strength decreased with the further increase of the OMMT content. Compared to that of PU, the elongation at break of the PU/OMMT nanocomposites increased, indicating that the stretch of PU/OMMT nanocomposites increased. |
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| Keywords: | Polyurethane nanocomposites Structure Mechanical properties |
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