丙烯腈-丁二烯-异戊二烯三元无规共聚物的催化加氢及表征

摘要

以三(三苯基膦)氯化铑[ RhCl( PPh3)3]为催化剂,甲苯为溶剂,对自制的丙烯腈-丁二烯-异戊二烯三元无规共聚物(NBIR)进行催化加氢,考察了反应温度、催化剂用量对加氢反应的影响,采用核磁共振氢谱、傅里叶变换红外光谱、差示扫描量热分析和热重分析等方法对氢化物进行了分析表征.结果表明,在反应温度为145℃、反应压力为3 MPa、催化剂质量分数占原胶的0.46％、反应时间为3h的条件下,该催化剂对NBIR有最高加氢反应活性,氢化度可达到76.1％,氢化物只有1个玻璃化转变温度(-15.9℃),耐热分解性明显改善.%The self-made acrylonitrile-butadiene-isoprene ternary random copolymer ( NBIR ) dissolved in toluene was hydrogenated with rhodium tris ( triphenylphosphine ) chloride as catalyst system, the effects of reaction temperature and dosage of catalyst on the hydrogenation reaction were investigated, and the hydrogenated NBIR was characterized by 1 H-nuclear magnetic resonance, Fourier transform infrared spectroscopy, differential scanning cal-orimetry and thermogravimetric analysis. The results showed that when the temperature was 145 ℃ , thernpressure was 3 Mpa , the mass fraction of catalyst was 0. 46 % to dry rubber, and the time was 3 h, the hydrogenation activity of the catalyst to NBIR was the highest, and the hydrogenation degree could reach 76. 1 %. The hydrogenated NBIR had only one glass transition temperature, -15.9 % , and the thermal decomposition resistance was improved.