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通过自由基接枝聚合方法由丙烯腈 (AN)单体和纤维素纤维 (CF)制取一种具有聚丙烯腈(PAN)表层的改性纤维素纤维 (PAN CF) .将AN接枝率 70 %的PAN CF用 2 .0 g/dLNaOH溶液进行水解 ,制得反应程度不同的系列水解PAN CF(Hyd .PAN CF)样品 .运用红外光谱法分析上述试样 ,以考察水解反应过程 .结果表明 ,PAN的碱水解过程是由反应速度不同的三个阶段构成 :前期增速缓慢 ,中期增速急剧 ,后期缓慢减速 .50 %以上的腈基在仅占水解过程总时间 1 /6(约 2 0分钟 )的反应中期转化 .
A modified cellulose fiber (PAN CF) having a polyacrylonitrile (PAN) surface layer was prepared from acrylonitrile (AN) monomer and cellulose fiber (CF) by a radical graft polymerization method. AN graft ratio 70% PAN CF was hydrolyzed with 2.0 g / dLNaOH solution to prepare a series of hydrolyzed PAN CF (Hyd. PAN CF) samples with different degrees of reaction. The above samples were analyzed by infrared spectroscopy to investigate the hydrolysis reaction. The results showed that the alkaline hydrolysis process of PAN was composed of three stages with different reaction rates: slow growth in the early stage, rapid growth in the medium term and slow decelerations in the late stage. The nitrile groups above 50% accounted for only about 1/6 of the total hydrolysis time 20 minutes) of the mid-transformation reaction.