| 水性聚氨酯硬段含量对其氢键相互作用及性能的影响 |
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| 引用本文： | 徐恒志,王焕,鲍俊杰,黄毅萍,许戈文.水性聚氨酯硬段含量对其氢键相互作用及性能的影响[J].应用化学,2011,28(7):770-776. |
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| 作者姓名： | 徐恒志 王焕 鲍俊杰 黄毅萍 许戈文 |
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| 作者单位： | (安徽大学化学化工学院，安徽省绿色高分子材料重点实验室 合肥 230039) |
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| 摘 要： | 异佛尔酮二异氰酸酯（IPDI）、二羟甲基丙酸(DMPA)作为硬段，合成了水性聚氨酯。 研究了硬段含量（质量分数）对乳液稳定性、膜耐热和力学性能等的影响。 当硬段质量分数低于26%时，乳液贮存稳定性较差。 随着硬段含量增加，聚氨酯膜拉伸强度迅速增加，断裂伸长率略有降低；红外光谱显示,自由的N-H伸缩振动峰强度减弱，氢键化N-H的振动峰强度增加；同时C=O伸缩振动峰整体向低波数方向移动，C=O伸缩振动峰峰形有明显的变化；DSC测试在50～125 ℃出现明显的氢键解离现象，吸热峰增强，证实了氢键作用力随着硬段含量的增加逐渐增强。 TG测试表明，水性聚氨酯硬段和软段分步解离，随着硬段含量的增加，硬段分解温度降低，水性聚氨酯耐热性能下降。
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| 关 键 词： | 水性聚氨酯 硬段 氢键作用 热性能 |
| 收稿时间： | 2010-08-24 |
Effect of the Content of Hard Segment on the Hydrogen Bonding Interactions and Properties of Waterborne Polyurethanes |
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| XU Hengzhi,WANG Huan,BAO Junjie,HUANG Yiping,XU Gewen.Effect of the Content of Hard Segment on the Hydrogen Bonding Interactions and Properties of Waterborne Polyurethanes[J].Chinese Journal of Applied Chemistry,2011,28(7):770-776. |
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| Authors: | XU Hengzhi WANG Huan BAO Junjie HUANG Yiping XU Gewen |
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| Institution: | (Anhui University,Anhui Key Laboratory of Environment-friendly Polymer Materials,;
School of Chemistry and Chemical Engineering,Hefei 230039) |
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| Abstract: | A series of waterborne polyurethanes(WPU) were prepared from isophorone diisocyanate(IPDI) and dimethylolpropionic acid(DMPA),which acted as the hard segment.Effects of the hard segment content on the emulsion stability,thermostability and mechanical properties of WPU had been studied.When the mass fraction of the hard segment was below 26%,the emulsion stability was poor.With the increase of hard segment content,the tensile strength of the resultant film prepared from WPU increased quickly,and the breaking... |
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| Keywords: | waterborne polyurethane hard segment hydrogen-bonding action thermal properties |
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