原位合成甲基丙烯酸锌增强氢化丁腈橡胶

用ZnO和甲基丙烯酸(MAA)经原位反应合成了甲基丙烯酸锌(ZDMA)，将其作为增强剂用以增强氢化丁腈橡胶(HNBR)，研究了ZnO／MAA(摩尔比，下同)、过氧化二异丙苯(DCP)用量和ZDMA用量对硫化胶力学性能的影响。结果表明，当ZnO／MAA为0．8，DCP用量为4份(质量，下同)时，原位合成ZDMA能够显著地提高HNBR的力学性能。随着ZDMA理论生成量的增加，硫化胶的拉伸强度先增加后减少，当ZDMA理论生成量为30份时，硫化胶的最大拉伸强度为47.2MPa．而扯断伸长率保持在393％以上；100％定伸应力随ZDMA理论生成量的增加而增加。经傅里叶变换红外光谱法和广角X光衍射法分析表明，在HNBR混炼过程中，ZnO和MAA可以原位生成ZDMA。

Reinforcement of hydrogenated nitrile rubber by in situ prepared zinc dimethacrylate

The mechanical properties and crosslinking structure of peroxide-cured hydrogenated nitrile rubber(HNBR) reinforced with zinc dimethacrylate(ZDMA),which was prepared by in situ preparation were studied. The effects of mole ratio of ZnO/methacrylic acid(MAA),dicumyl peroxide (DCP), ZDMA on the properties of HNBR vulcanizates were investigated. The experimental results showed that HNBR was greatly reinforced by ZDMA. The tensile strength of the HNBR/ZDMA vulcanizates reached as high as 47.2 MPa, whereas its elongation at break keeped over 393%. The process of in situ formation of ZDMA in the HNBR compound was verified by Fourier transform infrared spectroscopy and wide angle X-ray diffraction. Such vulcanizates contained both covalent crosslinking and ionic crosslinking and the value of relative crosslinking density had dependent on the amounts of DCP and ZDMA. The extraordinary high tensile strength of HNBR/ZDMA vulcanizates were related to ionic crosslinking density.