氢化度与丙烯腈含量对HNBR硫化胶性能的影响

Effect of Acrylonitrile Content and Hydrogenation on Properties of Hydrogenated Nitrile Rubber(HNBR) Vulcanizates

研究了氢化度和丙烯腈含量对氢化丁腈橡胶(HNBR)硫化特性、力学性能、热老化性能以及热性能的影响。利用核磁共振(NMR)考察了不同型号HNBR橡胶的交联性能;并采用凝胶色谱法(GPC)对生胶的分子量和分子量分布进行了测定,给出了橡胶门尼黏度与其分子量和分子量分布之间的关系。结果表明,随着氢化度与丙烯腈含量的增加,Tg升高;硫化胶的交联密度随着不饱和度和丙烯腈含量的增加而增加;氢化度升高,硫化胶的拉伸强度变化不大,扯断伸长率和撕裂强度降低,100%定伸增加;丙烯腈含量升高,硫化胶的拉伸强度、撕裂强度和100%定伸提高,扯断伸长率变化不大。

In this paper, effects of crylonitrile content and hydrogenation on vulcanization characteristics, physical performances, thermal aging performance and thermal properties of hydrogenated nitrile rubber （HNBR） were investigated. Crosslinking density of vulcanizates was tested by the nuclear magnetic resonance （NMR）, and crosslinking properties of different types of HNBR rubber were investigated furthet. Relative molecular weight and molecular weight distribution of raw material were tested by GPC. The relationship between molecular weight distribution and mooney viscosity of rubber was given. The glass-transition temperature is enhanced with an increase in the acrylonitrile content and hydrogenation, and the crosslinking density raises with the increase of the acrylonitrile and double bond content. High unsaturated HNBR shows low break elongation, tear strength, higher stress at 100 96, and tensile strength is improved little. With the incensement in crylonitrile content, tensile strength and tear strength are improved, stress at 100% is increased, however, break elongation has little change.