论文部分内容阅读
丁呲橡胶(丁二烯—2-甲基5-乙烯基吡啶共聚物)是最近发展起来的合成橡胶的一个新品种,它的特性粘数分子量关系,文献中尚无报道。作者等用丁二烯与2-甲基5-乙烯基吡啶(聚合配种比是75:25)在5°进行乳液共聚所得试样,经丙酮提取后,在甲苯溶液中以甲醇作沉淀剂连续进行了三次沉淀分级,选取其中六个级份溶于甲苯,在25.0°作渗透压和粘度测量,实验方法同前。渗透压数据用(π/C)~(1/2)对C作图法处理,如图1,这样得到的分子量和第二维利系数值列于表1;粘度数据仍按通用的处理方法,得到的结果也列在表1。
Ding bared rubber (butadiene-2-methyl 5-vinyl pyridine copolymer) is a new species of synthetic rubber recently developed, its intrinsic viscosity molecular weight relationship, no literature. The sample obtained by emulsion copolymerization of butadiene with 2-methyl-5-vinylpyridine (polymerization ratio is 75:25) at 5 ° was continuously extracted with acetone and then treated with methanol as a precipitating agent in a toluene solution Three precipitation classification, six of which were selected dissolved in toluene, at 25.0 ° for the osmotic pressure and viscosity measurements, the experimental method with the former. The osmotic pressure data are plotted with (π / C) ~ (1/2) for C, as shown in Figure 1. The molecular weights and the second VW values thus obtained are given in Table 1. The viscosity data are still in accordance with the general procedure The results obtained are also shown in Table 1.