Polyurethane foam is a kind of polymer composite material. The foaming turgidity and reaction temperature of polyurethane foam are closely related to its mechanical properties. According to our present knowledge, this study is the first time that fiber optic sensing technology has been applied to monitor the dynamics change in the foaming turgidity and reaction temperature of polyurethane foam during its preparation. The effects on the foaming expansion force, contractile force, and reaction temperature are studied through changing proportion of water among the ingredients of the polyurethane foam. The results have shown that the fiber optic Bragg grating wavelength varies due to the reaction temperature and foaming power. In the reaction process, the foaming expansion force can make the maximum wavelength change of fiber optic Bragg grating 1–3.5 nm, equivalent to 1000–3541 micro strain. And the highest temperature of the reaction was 42.6°C. The wavelength shifts of the fiber optic Bragg gratings were closely related to the reaction temperature and foaming power. The results show that fiber optic sensing technology can be used for the online kinetics monitoring of the reaction process of polyurethane foam plastics. The data obtained from the fiber optic Bragg grating could be used for the design and performance prediction of new polyurethane foam materials.

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聚氨酯泡沫的发泡动力学特性

聚氨酯泡沫是一种高分子复合材料。聚氨酯泡沫的发泡膨胀度和反应温度与其力学性能密切相关。据我们目前所知，这项研究是首次应用光纤传感技术监测聚氨酯泡沫制备过程中发泡膨胀度和反应温度的动态变化。通过改变聚氨酯泡沫成分中水的比例，研究了对发泡膨胀力、收缩力和反应温度的影响。结果表明，光纤布拉格光栅波长因反应温度和发泡能力而异。在反应过程中，发泡膨胀力可使光纤布拉格光栅的最大波长变化为1-3。5 nm，相当于 1000–3541 微应变。反应的最高温度为42.6℃。光纤布拉格光栅的波长位移与反应温度和发泡能力密切相关。结果表明，光纤传感技术可用于聚氨酯泡沫塑料反应过程的在线动力学监测。从光纤布拉格光栅获得的数据可用于新型聚氨酯泡沫材料的设计和性能预测。结果表明，光纤传感技术可用于聚氨酯泡沫塑料反应过程的在线动力学监测。从光纤布拉格光栅获得的数据可用于新型聚氨酯泡沫材料的设计和性能预测。结果表明，光纤传感技术可用于聚氨酯泡沫塑料反应过程的在线动力学监测。从光纤布拉格光栅获得的数据可用于新型聚氨酯泡沫材料的设计和性能预测。