Preparation and characterization of waterborne polyurethane/attapulgite nanocomposites
Preparation and characterization of waterborne polyurethane/attapulgite nanocomposites
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DOI：
10.1016/j.eurpolymj.2007.06.031
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发表时间：
2007-09
影响因子：
6
通讯作者：
H. Pan;Dajun Chen
中科院分区：
文献类型：
--
作者：
H. Pan;Dajun Chen
本文采用直接乳液共混法制备了水性聚氨酯（WPU）/凹凸棒土（AT）纳米复合材料。 WPU由聚丁二醇、4,4-二苯基甲烷二异氰酸酯、二羟甲基丁酸合成，并用三乙胺中和。断口的 SEM 检查表明 AT 颗粒不规则地分散在 WPU 基体中。 FTIR 分析表明，少量 AT 存在时，化学结构没有发生重大变化。 DMA 结果表明，与原始 WPU 相比，WPU/AT 纳米复合材料的储能模量有所增加，并且软段和硬段的玻璃化转变温度都移至更高的温度。通过TGA测量的样品的热阻随着AT的添加而提高。通过拉伸测试检查，纳米复合材料的机械性能显示出比原始 WPU 更高的拉伸强度和断裂伸长率。
In this paper, waterbrone polyurethane (WPU)/attapulgite (AT) nanocomposites have been prepared by direct emulsion blending. The WPU was synthesized from poly(tetramethylene glycol), 4,4-diphenylmethane diisocyanate, dimethylol butanic acid, and neutralized by triethylamine. SEM examination of fractured surfaces showed that AT particles were irregularly dispersed in the WPU matrix. FTIR analysis suggested no major chemical structural changed in the presence of a small amount of AT. DMA results showed that the storage modulus of WPU/AT nanocomposites was increased and the glass transition temperatures of both soft and hard segments shifted to higher temperature compared to the pristine WPU. Thermal resistance of the samples measured by TGA was improved with the addition of AT. The mechanical properties of the nanocomposites, examined by tensile tests, showed higher tensile strength and elongation at break than that of the pristine WPU.