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天然橡胶(NR)和氢化丁腈橡胶(HNBR)因不饱和度和极性的差异,存在硫化速度不匹配、填料分散等问题,难以实现两胶的并用。本文通过先制备不同硫黄/促进剂比例的NR和HNBR母炼胶,再将母炼胶并用制备NR/HNBR复合材料,解决了NR和HNBR共硫化的问题。研究了NR/HNBR的相态结构和填料在NR和HNBR两相的分散状态,结合相态结构和填料分散分析了NR/HNBR并用比对复合材料硫化特性、动静态力学性能、耐磨性和压缩温升的影响。结果表明:并用HNBR的复合材料混炼胶的门尼黏度增大,焦烧时间和正硫化时间缩短;随着HNBR含量增加,HNBR相的尺寸增大,硫化胶的硬度及100%和300%定伸应力增加,拉伸强度、撕裂强度、断裂伸长率和拉断永久变形减小,耐磨性和抗湿滑性提高,压缩疲劳温升增大。 相似文献
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探讨了多种共混橡胶的共硫化体系及其对共混橡胶性能的影响。其中采用共硫化剂硫化CO/ECO、CSM/NBR、IIR/EPDM、IIR/CIIR共混胶,采用复合硫化剂硫化PUR/CR、ACM/ECO、ACM/NBR、CR/CIIR、CR/SBR共混胶,研究了硫化体系品种和用量对几种共混胶的硫化特性和力学性能的影响,为共混橡胶的硫化提供研究方案和理论指导。 相似文献
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Anoma Thitithammawong Nattapon Uthaipan Banja Junhasavasdikul Charoen Nakason Ekwipoo Kalkornsurapranee 《应用聚合物科学杂志》2019,136(23):47613
Possibility of co-vulcanization of ethylene octene copolymer (EOC) and ethylene propylene diene terpolymer (EPDM) molecules was studied by assessing the curing characteristic and crosslinking kinetics of EOC and EPDM compounds. Regarding curing, the curing characteristics, cure rate index, and the torque difference (MH − ML) of the EPDM compound are quite similar to those of the EOC compounds at the curing temperature of 180 °C, especially when the EOC octene comonomer content is 5.9 or 9.7 mol %. The kinetic parameters E a and k were analyzed. The study showed that EOC with 9.7 mol % octene comonomer content is very suitable for blending with EPDM, as it has crosslinking kinetics similar to the EPDM. This observation confirms the possibility of chemical co-crosslinking at EPDM–EOC interfaces, especially at the curing temperature of 180 °C. Differential scanning calorimetry and dynamic mechanical analysis were also used to assess interfacial crosslinking. The lowest activation energy of vulcanization is found for the EPDM/EOC blend with 9.7 mol % octene comonomer contents. Furthermore, chemical co-crosslinking in combination with chain flexibility in the EPDM/EOC blend with 9.7 mol % octene comonomer contents give lower tan δ at room temperature than for the blends with octene comonomer contents of 5.9 and 16.9 mol %. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47613. 相似文献
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NR/EPDM并用胶共硫化的研究 总被引:9,自引:2,他引:9
采用了一种新的工艺方法-热处理-动态硫化法,有效地改善了NR/EPDM并用胶的共硫化性和力学性能。在硫化体系不变的情况下,可用硫化曲线定笥比较并用胶的共硫化程度。通过分析比较认为,粘弹谱仪法是测定并用硫化胶两相交联程度的简便可靠方法。 相似文献
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