Abstract

Good resistance to the solvent and excellent adhesion to many substrates are the significant features of polysulfide polymers. They are known to have extensive applications as sealants, adhesives and coatings. In this research, a series of polysulfide polymers of linear organic monomer (ethylene dichloride) and sodium-based aqueous monomers are synthesized using interfacial polymerization and zinc oxide (ZnO) is used as a curing agent. The curing process of the synthesized polymers is studied using a rheometer at 160 °C. The cured and uncured samples are characterized by Fourier-transform infrared, Raman, XRD, DSC, Shore A and tensile tests. XRD results showed that cured samples possessed complete amorphous behavior whereas in the non-cured samples the structure shifts to the amorphous phase by increasing the sulfur content. The study of mechanical properties showed that with increasing sulfur content, the elastic modulus and elongation at break were increased. Furthermore, the glass transition temperature and crosslinking density were increased with increasing sulfur content whereas hardness was decreased. Besides, Thermogravimetric analysis results showed that in the cured samples the thermal stability was increased with increasing sulfur content. Also, all samples were resistant to benzine, gasoline, white spirit, engine oil and brake-fluid.

摘要

良好的耐溶剂性和对许多基材的优异附着力是多硫化物聚合物的显着特征。众所周知，它们作为密封剂，粘合剂和涂料具有广泛的用途。在这项研究中，使用界面聚合反应合成了一系列线性有机单体（二氯乙烷）和钠基水性单体的多硫化物聚合物，并使用氧化锌（ZnO）作为固化剂。使用流变仪在160°C下研究了合成聚合物的固化过程。通过傅立叶变换红外，拉曼，XRD，DSC，Shore A和拉伸试验对固化和未固化的样品进行表征。XRD结果表明，固化的样品具有完全的非晶态行为，而在未固化的样品中，结构通过增加硫含量而转变为非晶相。力学性能研究表明，随着硫含量的增加，弹性模量和断裂伸长率均增加。此外，玻璃化转变温度和交联密度随着硫含量的增加而增加而硬度降低。此外，热重分析结果表明，在固化的样品中，热稳定性随硫含量的增加而增加。另外，所有样品均耐汽油，汽油，石油溶剂油，发动机油和制动液。热重分析结果表明，在固化的样品中，热稳定性随硫含量的增加而增加。另外，所有样品均耐汽油，汽油，石油溶剂油，发动机油和制动液。热重分析结果表明，在固化的样品中，热稳定性随硫含量的增加而增加。另外，所有样品均耐汽油，汽油，石油溶剂油，发动机油和制动液。