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<正> N-乙烯基咔唑(NVC)具有大的共轭结构和中间有一个杂原子氮,而容易与其它试剂反应,形成自由基、阳离子和电荷转移络合物,故是一种活性较高的单体,1970年有人发现NVC与N-C_4H_9NCl_2一起可以引发甲基丙烯酸甲酯(MMA)聚合,此外,文献报道了电子给体如胺与CCl_4体系在二甲亚砜(DMSO)中引发MMA聚合,本文研究了NVC与几种卤代烃所组成的双组分体系对MMA的引发聚合反应;该体系的引发活性和组成与分子量及分子量分布的关系;并探讨了反应机理。 相似文献
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李贵华 《应用数学和力学(英文版)》1986,(2)
The present paper continues the pansystems research on fixed subsets.under thepansystems framework it gives the existence criterion of I-type fixed subsets and thetheorems about the relations between the classes of reflexive and equivalent relations andfixed subsets;introduces the concept of fixpoints of binary relations in levobi(?)severalexistence theorems about fixpoints for a kind of panweighted network. 相似文献
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本文继续有关不动子集的泛系研究.在泛系框架下得到了Ⅰ型不动子集的存在准则;给出了自反关系类及等价关系类与不动子集的关系定理;引进了二元关系的不动点概念并对一类泛权网络建立了几个不动点存在定理. 相似文献
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本文研究了光照对二氯二茂钛催化丙烯腈与甲基丙烯酸甲酯共聚合反应的影响.以NMR谱法测定了共聚物中两种单体的组成比.用四种方法计算了竞聚率r1和r2.证明了在光照下二氯二茂钛对单体催化聚合过程为一种自由基机理. 相似文献
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The description of the characteristics of the structure and the quantity in fixed pansystems theorems 总被引:1,自引:1,他引:0
李贵华 《应用数学和力学(英文版)》1984,5(6):1867-1874
Pansymmetry is the abstract of symetry, stability and other concepts in physics and so on. Fixed pansystems theorems portray a typical pansymmetry of systemic structure. The present paper complements and extends the Work in concerned in fixed pansystems theorems. It gives in finite case the structural character of fixed subsets; the criterion of existence of the least fixed subset, and the numbering formula of fixed subsets and minimal fixed subsets. 相似文献