Abstract In this work, two polysulfide polymers were synthesized using aromatic organic monomer (α,α′-dichloro-p-xylene) and sodium disulfide (Na2S2) and sodium tetrasulfide (Na2S4) aqueous monomers. Then, the curing process of the polymers was carried out at 170° C using a rheometer. The structural characteristics of synthesized and cured samples were identified by Raman and Fourier transform infrared (FT-IR) spectroscopies. Also, morphological and thermophysical properties of samples were studied by using the X-ray diffraction (XRD) and differential scanning calorimetry (DSC), respectively. Moreover, the molecular weight of the synthesized samples was determined by proton nuclear magnetic resonance (1H NMR). Furthermore, the mechanical properties and hardness of the samples were investigated by tensile test and Shore A. The results showed that in the noncured samples during the increase of sulfur in the polymer structure, solubility was increased whereas it decreased the hardness, melting point (Tm ) and glass transition temperature (Tg ) of polymers. But in cured samples, hardness and Tg increase by increasing sulfur and the mechanical properties also improved. This is due to the increase in crosslinks. Also, Tm and solubility are not observed due to the formation of crosslinks.

中文翻译：

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聚（对二甲苯二硫化物）和聚（对二甲苯四硫化物）：合成、固化以及机械和热物理特性的研究

摘要 在这项工作中，使用芳香族有机单体（α,α'-二氯-对二甲苯）和二硫化钠（Na2S2）和四硫化钠（Na2S4）水性单体合成了两种多硫化物聚合物。然后，使用流变仪在170℃下进行聚合物的固化过程。合成和固化样品的结构特征通过拉曼和傅里叶变换红外 (FT-IR) 光谱进行鉴定。此外，分别使用 X 射线衍射 (XRD) 和差示扫描量热法 (DSC) 研究了样品的形态和热物理性质。此外，合成样品的分子量通过质子核磁共振（1H NMR）测定。此外，通过拉伸试验和肖氏 A 试验研究了样品的力学性能和硬度。结果表明，在未固化样品中，随着聚合物结构中硫的增加，溶解度增加，而聚合物的硬度、熔点（Tm）和玻璃化转变温度（Tg）降低。但在固化样品中，硬度和 Tg 随硫含量的增加而增加，机械性能也得到改善。这是由于交联增加。此外，由于交联的形成，未观察到 Tm 和溶解度。