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首页> 外文期刊>Journal of Applied Polymer Science >Effect of storage time on the characteristics of a waterborne polyurethane/tetraethoxysilane mixture and the properties of prepared films
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Effect of storage time on the characteristics of a waterborne polyurethane/tetraethoxysilane mixture and the properties of prepared films

机译：储存时间对水性聚氨酯/四乙氧基硅烷混合物特性的影响及制备薄膜的性质

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摘要

Waterborne polyurethane (WPU) is one of the most important resins. The properties of WPU can be modified by introducing inorganic components. Tetraethoxysilane (TEOS) is a precursor for preparing inorganic polymers and can be used to prepare WPU/silica hybrids. In this study, WPU dispersion was synthesized by reacting polytetramethylene ether glycol and dimethylolpropionic acid with isophorone diisocyanate, followed by chain extension with ethylenediamine. After mixing WPU with TEOS, the mixture was sealed and stored at room temperature for different lengths of times. The influence of time on the characteristics of the WPU/TEOS mixture and the properties of films were investigated. The results showed that the viscosity, surface tension and average particle size of the mixture increased with prolonged storage time. Si-29-NMR analysis indicated that the structure of silica exists in the WPU film. DSC, DMA and TGA results showed that WPU/silica films made from the mixture have less thermal activity, higher storage modulus, lower damping peak heights and better heat resistance after relatively long storage times.
机译：水性聚氨酯（WPU）是最重要的树脂之一。通过引入无机组分，可以改善WPU的性能。四乙氧基硅烷（TEOS）是制备无机聚合物的前体，可用于制备WPU/二氧化硅杂化物。本研究中，通过将聚四乙醚乙二醇和二羟甲基丙酸与异佛尔酮二异氰酸酯反应，然后与乙二胺扩链，合成了WPU分散体。将WPU与TEOS混合后，将混合物密封并在室温下储存不同时间。研究了时间对WPU/TEOS混合物特性和薄膜性能的影响。结果表明，随着贮存时间的延长，混合物的粘度、表面张力和平均粒径增大。Si-29-NMR分析表明，WPU薄膜中存在二氧化硅结构。DSC、DMA和TGA结果表明，用该混合物制备的WPU/sio2薄膜在相对较长的贮存时间后，具有较小的热活性、较高的储能模量、较低的阻尼峰高度和较好的耐热性。

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