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本文用膨胀计法研究抗氧剂二乙羟胺(DEHA)对过氧化苯甲酰(BPO)引发苯乙烯(ST) 聚合的阻聚作用,研究结果表明:在苯乙烯聚合反应中,当DEHA用量近似等于单体用量的0.01—0.03%时,能产生较用对叔丁基邻苯二酚(TBC),2.5-二叔丁基对苯二酚(DTHQ) 以及苯醌 (BQ) 等更长的阻聚期,阻聚期后,聚合速度也甚低,特别是当DEHA分别同BQ,TBC以及DTHQ混合使用时,阻聚期更长,研究结果还指出:当同一阻聚剂浓度增加时,转化率及速率均降低,在用TBC,DTHQ以及BQ作阻聚剂时,聚合度也变小,但用DEHA时,一般得不到可现量的固体聚合物,当引发剂浓度增加时,反应速率增加,转化率提高,聚合度也略有降低,加有DEHA时,同样得不到固体聚合物. 本文还用ESR方法研究了阻聚机理。
In this paper, the dilatometer was used to study the polymerization inhibition of benzoyl peroxide (BPO) -based styrene (ST) by DEHA. The results showed that in the polymerization of styrene, Approximately equal to 0.01-0.03% of the amount of monomers, can produce more resistance than with t-butyl catechol (TBC), 2.5-di-tert-butyl hydroquinone (DTHQ) and benzoquinone (BQ) Polymerization, polymerization after the polymerization rate is very low, especially when DEHA mixed with BQ, TBC and DTHQ, respectively, the longer polymerization resistance, the results also pointed out that: the same polymerization inhibitor concentration increases, the conversion Rate and rate are reduced, the use of TBC, DTHQ and BQ as a polymerization inhibitor, the polymerization degree becomes smaller, but with DEHA, generally can not get the actual amount of solid polymer, when the initiator concentration increases, the reaction The rate of increase, the conversion rate increased, the degree of polymerization also decreased slightly, adding DEHA, also can not get solid polymer.In this paper, ESR method was also used to study the polymerization mechanism.