Effects of Silicone Surfactant on the Properties of Open-Cell Flexible Polyurethane Foams
Effects of Silicone Surfactant on the Properties of Open-Cell Flexible Polyurethane Foams
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DOI：
10.1002/adv.21643
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发表时间：
2018-02-01
影响因子：
3.1
通讯作者：
Ohadi, A. R.
中科院分区：
文献类型：
--
作者：
Baferani, A. Hasani;Keshavarz, R.;Ohadi, A. R.
本文研究了有机硅表面活性剂对聚氨酯软泡沫塑料力学性能、热学性能和声学性能的影响。首先，通过介绍泡沫生产的反应和表示化学计量关系，提供了一种方法来选择的基本化合物的量，以获得所需的性能。通过在选择用于反应的发泡剂的量之后知道多元醇的OH值和异氰酸酯的NCO含量，可以找到产生所需泡沫的每种化合物的量。通过制备合适的样品，使用不同的仪器测量或计算泡沫的力学、热学、非声学和声学性能。基于两种不同的方法获得非声学特性，即，半现象学方法和间接方法。通过将理论计算的吸声系数与实测值进行比较，验证了所得到的特性。结果表明，在表面活性剂用量不多的情况下，泡沫材料的声学性能提高了50%左右，而泡沫材料的其它力学性能和热性能没有明显变化。这种改善是由于成网率和泡孔大小的变化。此外，在化学计量关系中考虑的初始所需孔隙率和密度在所生产的样品中相当地实现。这些结果验证了化学计量关系式的准确性。
In this paper, the effects of silicone surfactant on the mechanical, thermal, and acoustical properties of flexible polyurethane foams are studied. At first, by introducing the reactions of the foam production and expressing the stoichiometric relationships, a method is provided to select the amounts of the basic compounds for getting the desirable properties. By knowing the OH number of polyol and the NCO content of isocyanate after selecting an amount of a blowing agent for the reaction, the quantity of each compound to produce the desirable foam can be found. Then different foams with various amounts of surfactant are produced. By preparing proper samples, the mechanical, thermal, nonacoustical, and acoustical properties of the foams are measured or calculated by using different instruments. The nonacoustical properties are obtained based on two distinct methods, i.e., a semiphenomenological method and an indirect method. The obtained properties are validated by comparing the calculated theoretical sound absorption coefficients with the measured ones. The results show that with a small increase of surfactant, the acoustical properties of foam samples improve by about 50% without any significant changes in other mechanical and thermal properties of the foams. This improvement results from the variations of reticulation rate and cell size. In addition, the initial desirable porosity and density considered in the stoichiometric relations are fairly achieved in produced samples. These results validate the accuracy of the stoichiometric relations.