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通过共沉淀法和离子交换法制得硝酸根型水滑石(LDH-NO3)和对苯乙烯磺酸钠改性水滑石(LDHSSS),进一步将它们作为填料与丁腈橡胶(NBR)制备了LDH/NBR复合材料。通过X射线衍射分析了水滑石的结构特征,结果表明,SSS成功插入到LDH层间。LDH/NBR复合材料的傅里叶红外光谱分析表明,LDH-NO_3/NBR复合材料在老化过程中NBR主链在C—H处发生了断链,形成了含双键的短链烯烃分子链,而后短链烯烃分子链发生交联反应,进而降解;而LDH-SSS/NBR复合材料老化时NBR与LDH-SSS发生了交联反应,老化速率降低。扫描电子显微镜表征证实了这一机理。
Nitrate-type hydrotalcite (LDH-NO3) and sodium para-styrenesulfonate-modified hydrotalcite (LDHSSS) were prepared by coprecipitation and ion-exchange method, and further LDHSS was used as filler and nitrile rubber (NBR) NBR composite material. The structural characteristics of hydrotalcite were analyzed by X-ray diffraction. The results showed that SSS was successfully inserted between LDH layers. Fourier transform infrared spectroscopy analysis of LDH / NBR composites showed that the main chain of NBR in the LDH-NO 3 / NBR composites was broken at C-H during aging, forming a short-chain olefin chain containing double bonds and then The cross-linking reaction of short-chain alkene molecular chains leads to degradation. However, the cross-linking reaction between LDR-SSS and LDR-SSS / NBR composites leads to a decrease of the aging rate. Scanning electron microscopy characterization confirmed this mechanism.