Abstract:

Comb-branched water-borne polyurethane/montmorillonite (CWPU/MMT) nanocomposites were prepared using comb-branched polymeric diols and montmorillonite as raw materials by in-situ intercalating polymerization. The effect of the structure of MMT in CWPU matrix on the mechanical properties, heat-resistance and water-resistance of CWPU/MMT nanocomposites was studied. Na⁺ -MMT was aggregated in CWPU matrix, which had no influence on the mechanical properties and heat-resistance of nanocomposites and reduced the water-resistance of nanocomposites.2T-MMT and C₁₈-MMT were distributed uniformly with intercalated and exfoliated layers into the CWPU matrix, which results in obvious improvement of mechanical properties, heat-resistance and water-resistance of nanocomposites.2T-MMT was more effective than C₁₈-MMT for the modification on CWPU.

摘要：

以自制的新型梳状支链聚合物二醇和蒙脱土为原料，采用原位插层聚合技术制备了梳状支链结构水性聚氨酯/蒙脱土（CWPU/MMT）复合材料，着重考察了蒙脱土对CWPU/MMT复合材料力学性能、耐热性能和耐水性能的影响。结果表明，在CWPU/MMT复合材料中，Na⁺ -MMT以团聚体存在于CWPU中，分散不均匀，观察不到Na⁺ -MMT的插层结构，对材料的力学性能和耐热性没有明显的影响，反而显著降低了材料的耐水性；2T-MMT和C₁₈-MMT在CWPU中分散均匀，可同时观察到OMMT的插层结构和OMMT的剥离片层，能明显提高材料的力学性能、耐热性和耐水性，其中以2T-MMT对CWPU力学性能、耐热性和耐水性的提高最为显著。