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Hexamethylene diamine-modified epoxidized natural rubber and its effect on cure characteristics and properties of natural rubber blends
Iranian Polymer Journal ( IF 2.4 ) Pub Date : 2020-09-22 , DOI: 10.1007/s13726-020-00865-x
Rutchanon Longseng , Chuanpit Khaokong

Compatibility is a serious problem in silica-added natural rubber (NR) because of the difference in the polarities of silica and NR. Thus, a coupling agent, such as silane, or a compatibilizer must be incorporated. In this work, amine-functionalized NR was synthesized by an in situ epoxidation process using performic acid and later modified with hexamethylene diamine (HMDA) by a ring-opening reaction. The effects of amine-modified epoxidized NR (ENR-HMDA) content on the cure characteristics, physical and mechanical properties of various NR blends (NR/ENR-HMDA) without filler were studied. ENR-HMDA enhanced the vulcanization process. The maximum torque of compounds increased with the corporation of ENR-HMDA and scorch time and cure time decreased. The cure rate index of NR/ENR-HMDA increased by 98%. All vulcanized rubber blends showed the strain-induced crystallization at high extension. Mechanical properties and crosslink density of the blends were higher than those of NR and NR incorporated with unmodified ENR. Tensile strength was 61% and 43% higher than that for NR and NR/ENR, respectively. The NR/ENR-HMDA blends showed a single Tg that indicated the miscibility of both components. The developed ENR-HMDA compound can be used to improve the compatibility of NR and fillers which would enable the fabrication of a wide range of rubber products.



中文翻译:

六亚甲基二胺改性的环氧化天然橡胶及其对天然橡胶共混物硫化特性和性能的影响

由于二氧化硅和NR的极性不同,相容性在添加二氧化硅的天然橡胶(NR)中是严重的问题。因此,必须掺入偶联剂,例如硅烷或增容剂。在这项工作中,使用过甲酸通过原位环氧化工艺合成了胺官能化的NR,​​随后通过开环反应用六亚甲基二胺(HMDA)对其进行了改性。研究了胺改性的环氧化NR(ENR-HMDA)含量对无填料的各种NR共混物(NR / ENR-HMDA)的固化特性,物理和机械性能的影响。ENR-HMDA增强了硫化过程。随ENR-HMDA的增加,复合材料的最大扭矩增加,焦烧时间和固化时间减少。NR / ENR-HMDA的治愈率指数提高了98%。所有硫化橡胶共混物在高延伸率下均显示出应变诱导的结晶。共混物的机械性能和交联密度高于未改性的ENR的NR和NR。拉伸强度分别比NR和NR / ENR高61%和43%。NR / ENR-HMDA共混物显示单个Tg表示两个组件的互溶性。研发的ENR-HMDA化合物可用于改善NR和填料的相容性,从而可制造各种橡胶产品。

更新日期:2020-09-22
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