4-乙烯基吡啶与苯乙烯的沉淀共聚

O. Nikolaeva, L. Vretik, E. Yanovska, O. Kondratenko, G. Tun
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引用次数: 0

摘要

介绍了在CCl4沉淀共聚条件下形成的4-乙烯基吡啶与苯乙烯共聚物的实际组成的测定方法。为此,4-乙烯基吡啶与苯乙烯以不同的比例共聚。所得共聚物的组成通过1H NMR谱测定。并将实际的共聚物组成与理论计算的共聚物组成进行了比较。在密封安瓿中,在氩气介质中进行了苯乙烯与4-乙烯基吡啶的共聚反应。制备了浓度为1.02 mol/l的CCl4溶液。加入量为0.00106 mol/l的偶氮二异丁腈引发剂。共聚在恒温器C1823中进行,温度为T = 75±0.5℃。共聚时间为3小时。单体初始比(4-乙烯基吡啶:苯乙烯)= 6:1;5:1;4:1;3:1;2:1;1:2;1:3;1:4;1:5;1:6。所得共聚物的组成通过1H NMR谱测定。在CCl4中沉淀法共聚得到的4-乙烯基吡啶-苯乙烯共聚物被4-乙烯基吡啶键富集。相反,根据文献计算的共聚物的瞬时组成表明,在经典共聚条件下,4-乙烯基吡啶溶液中的活性低于苯乙烯。计算了苯乙烯与4-乙烯基吡啶共聚的理论相对常数:r1 = 1.97;R2 = 0.93。因此,在经典共聚条件下,4-乙烯基吡啶的活性低于苯乙烯(r2 < r1)。还发现,对于苯乙烯的原始摩尔含量大于0.85时,用沉淀法聚合成CCl4的方法合成4-乙烯基吡啶:苯乙烯共聚物是不可能的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
PRECIPITATION COPOLYMERIZATION OF 4-VINYLPYRIDINE AND STYRENE
The determination of the copolymers of 4-vinylpyridine with styrene copolymers real composition, formed under the conditions of precipitation copolymerization in CCl4, is described. For this, 4-vinylpyridine with styrene was copolymerized in different ratios. The composition of the obtained copolymers was determined according to 1H NMR spectroscopy. A comparison of the real copolymers composition with the theoretically calculated ones was performed as well. The copolymerization of styrene with 4-vinylpyridine was carried out in sealed ampoules in argon medium. Solutions of a concentration of 1.02 mol/l in CCl4 were prepared. The initiator azobisisobutyronitrile in the amount of 0.00106 mol/l was added. The copolymerization was carried out in a thermostat C1823 at T = 75 ± 0.5°C. The copolymerization time was 3 hours. The original ratio of monomers (4-vinylpyridine:styrene) = 6:1; 5:1; 4:1; 3:1; 2:1; 1:2; 1:3; 1:4; 1:5; 1:6. The composition of the obtained copolymers was determined according to 1H NMR spectroscopy. It was determined that copolymers of 4-vinylpyridine with styrene obtained by precipitation copolymerization in CCl4 were enriched by 4-vinylpyridine bonds. On the contrary, the calculation of the instant composition of the copolymers according to the literature shows that under the conditions of classical copolymerization in 4-vinylpyridine solution is less active than styrene. We calculated the theoretical relative constants of copolymerization of styrene with 4-vinylpyridine: r1 = 1.97; r2 = 0.93. Therefore, under the conditions of classical copolymerization in solution 4-vinylpyridine is less active than styrene (r2 < r1). It was also found out that for the original molar content of styrene if it is greater than 0,85, it is not possible to synthesize by means of precipitation polymerization into CCl4 the copolymers of 4-vinylpyridine:styrene.
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