论文部分内容阅读
本文报导利用放射性(60)~Coγ射线引发三氟氯乙烯本体聚合进行了小试验、扩大试验和产品加工使用试验。聚合速率与辐照强度成0.5次方关系,聚合按自由基机制进行。聚合总活化能为5.3千卡/克分子,引发活化能趋近于零,聚合进程平稳。聚合后效应随辐照强度的增大而增大,与其他试验条件关系不大。起始6小时的后效应约为总后效应聚合率的40％。通过扩大试验,得到较优惠的工艺条件是:辐照强度I=4～14伦/秒,辐照温度15～30℃,辐照时间(t)近似地由下式表示:t=-1.6I+50.4(小时)由于用高能射线引发本体聚合,不需添加化学引发剂及溶剂,免除了繁杂的后处理过程。加工使用的结果证明,产品质量比较稳定和优越,并可在液氮温度下使用。聚合过程的回收单体,不需精制可再供聚合使用。只要将所得聚合物中残留微量单体尽量回收,则整个工艺过程基本上不存在三废问题。
This paper reports the experiments of small, extended and product processing using the bulk polymerization of trifluorochloroethene initiated by radioactive (60) ~ Coγ rays. The polymerization rate and irradiation intensity into a 0.5 relationship, polymerization by free radical mechanism. The total activation energy of polymerization was 5.3 kcal / mol and the activation energy was approached to zero. The polymerization process was stable. After polymerization, the effect increases with the increase of irradiation intensity, and has little to do with other experimental conditions. The post-6-hour post-effect is about 40% of the total post-polymerization rate. By expanding the test, more favorable process conditions are obtained: the irradiation intensity I = 4 ~ 14 Lun / sec, the irradiation temperature 15 ~ 30 ℃, the irradiation time (t) is approximately represented by the following formula: +50.4 (hrs) Due to the bulk polymerization initiated with high-energy rays, there is no need to add chemical initiators and solvents, eliminating the need for complicated post-treatment processes. Processing results show that the product quality is more stable and superior, and can be used at liquid nitrogen temperature. Recycling monomer polymerization process, without refining can be used for polymerization. As long as the resulting polymer residual trace monomer as far as possible recovery, the entire process basically does not exist three waste problems.