梳状支链水性聚氨酯/蒙脱土复合材料结构与性能

Structure and properties of comb-branched water-borne polyurethane/montmorillonite nanocomposites

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。

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.