乙烯系单体自由基聚合的阻聚效应(ⅩⅤ)——某些羟胺对苯乙烯-丙烯腈共聚阻聚行为的研究

Inhibiting Effect of Radical Polymerization of Vinyl Monomers(ⅩⅤ)——Studies on the Behaviour of Some Substituted Hydroxyl amines in the Copolymerization of Styrene with Aeryloititrile

研究了二乙基羟胺(DEHA)、二异丙基羟胺(DIPHA)和吗啉羟胺(MPHA)对过氧化苯甲酰(BPO)60℃引发的苯乙烯(St)-丙烯腈(AN)共聚合的阻聚行为.结果表明3种羟胺对St-AN共聚均有良好的阻聚作用,阻聚功效DEHA>MPHA>DIPHA.同时观察到St-AN竞聚率受羟胺的影响.羟胺用量约500 ppm时,r_(St)减小、r_(AX)增大.共聚物组成曲线中恒比共聚点也分别由原来0.62降至0.55、0.54和0.57(DEHA、DIPHA和MPHA).

The behaviour of N,N'-diethylhydroxylamine (DEHA),N,N'-diisopropyl-hydroxylamine(DIPHA) and 4-hydroxylmorpholine(MPHA) as inhibitors of the copolymerization of styrene(M1) with acrylonitrile(M2) initiated by benzoyl peroxide,at 60℃ was investigated.The result showed that the three kinds of hydroxyiamines were proved to be the very efficient inhibitors and their relative inhibiting order was DEHA>MPHA>DIPHA.It was also found that the reactivity radios of St and AN are different for various inhibitors.When the a-mount of hydroxyiamines is about 500 ppm,r1 decreases and r2 increases and the azeotropic point of copolymerization of St-AN decreases from 0.62 to 0.55,0,54 and 0,57 for DEHA,DIPHA and MPHA respectively,showing an increasing tendency toward alternating copolymerization.