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通过合成一种含有二硫代羧基,羧基和镧离子的新型稀土促进剂——谷氨酸二硫代氨基甲酸镧(简称La-GDTC),并利用平衡溶胀法研究了La-GDTC对丁苯橡胶(SBR)/SiO2复合材料界面作用的影响.交联密度测试表明,SiO2的加入能够有效提高SBR/La-GDTC/SiO2复合材料的交联密度;而SBR/La-GDTC/SiO2复合材料的溶胀Gibbs自由能ΔG下降,熵减ΔS上升,表明了复合材料的硫化网络非均匀性提高,SiO2的界面化学环境发生改变;Kraus曲线得到的聚合物-填料相互作用参数证实了La-GDTC能够提高SBR与SiO2的界面黏结.应力-应变曲线表明La-GDTC对SBR/SiO2复合材料的增强作用明显优于二乙基二硫代氨基甲酸锌(ZDC)体系.通过扫描电镜照片分析,证实了La-GDTC能够促进SiO2在SBR基体中的分散和提高橡胶基体与SiO2的界面黏结作用;而ZDC则不具备这些功能.
A novel rare-earth accelerator, La-GDTC, containing dithiocarboxy, carboxyl and lanthanum ions was synthesized and characterized by means of equilibrium swelling method. (SBR) / SiO2 composites. The cross-linking density tests show that the addition of SiO2 can effectively improve the crosslink density of SBR / La-GDTC / SiO2 composites. Swelling Gibbs free energy ΔG decreased, entropy decreased ΔS increased, indicating that the composite network sulfide heterogeneity increased, SiO2 interface chemical environment changes; Kraus curve obtained polymer-filler interaction parameters confirmed La-GDTC can improve The interfacial bonding between SBR and SiO2 shows that the enhancement of La-GDTC on SBR / SiO2 composites is obviously superior to that of zinc diethyldithiocarbamate (ZDC) .According to the scanning electron micrographs, it is confirmed that La- -GDTC can promote the dispersion of SiO2 in the SBR matrix and improve the interfacial bonding between the rubber matrix and SiO2; ZDC does not have these functions.