论文部分内容阅读
本文首先研究了水-铈盐-丙烯腈系统在黑暗及有空气存在的条件下的聚合速度,指出水与铈盐生成HO·基的反应不一定必须通过光能的吸收。与Mino的报导不同,在研究水-铈盐-丙烯脯-纤维素系统中的接聚反应时发现,虽然在很大程度上改变反应条件,均聚物总是会生成的。这说明,纤维素的加入并不能抑制水-铈盐-丙烯腈系统中所固有的均聚反应。因此,Mino的接聚系统中实际上存在着二个氧化还原系统,即铈盐-纤维素与水-铈盐,前者能产生纤维素大分子自由基而接聚,后者能生成HO·低分子自由基而均聚。由于Mino没有充分考虑到后者,所以他对反应机理的描述,是不够全面的。 在研究了该系统均聚反应的基础上,我们提出了把引发和接聚分离进行,并在单体汽相中接枝,使均聚物生成量大为减少,这在反应时间延长时表现得更为显著。 我们还研究了强力粘胶帘子綫在接聚丙烯腈后的纤维性貭。实验表明变性纤维在耐光、耐腐、抗化学试剂、湿态强度等性能方面有很大改善。
In this paper, the polymerization rate of water-cerium salt-acrylonitrile system in the presence of darkness and air was firstly studied. It is pointed out that the reaction of water with cerium salt to form HO · group does not necessarily have to be absorbed by light energy. Unlike Mino’s report, when investigating the polyaddition reaction in a water-cerium-propylene-propylene-cellulose system, it was found that homopolymers are always formed, although the reaction conditions are largely changed. This shows that the addition of cellulose does not inhibit the homopolymerization reaction inherent in the water-cerium salt-acrylonitrile system. Therefore, there are actually two redox systems in Mino’s graft copolymerization system, namely, cerium salt-cellulose and water-cerium salt. The former can produce cellulose macromolecules free radicals to form polycondensation and the latter can produce HO · low Molecular free radicals and homopolymerization. Because Mino did not fully consider the latter, his description of the reaction mechanism is not comprehensive enough. On the basis of studying the homopolymerization reaction of this system, we propose to initiate and polymerize and separate and carry out, and grafting in the monomer vapor phase to greatly reduce the amount of homopolymer produced, which is manifested when the reaction time is prolonged More obvious. We also studied the fibrous viscose of the strong viscose cord after the polyacrylonitrile. Experiments show that denatured fibers in the light, corrosion resistance, chemical resistance, wet strength and other properties have greatly improved.