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Fine preparation and mass production of the four-arms star polymers, being furnished to physicochemical researchers.

四臂星形聚合物的精细制备和量产，提供给理化研究人员。

基本信息

批准号：
04555216
负责人：
SE Kazunori
金额：
$ 2.88万
依托单位：
Fukui University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

We summarize the results obtained from this project during the first and the second year.1. Preparation of the end-polymerizationalized polymers (Macromonomer) : alpha-methylstirene was anionically polymerized and the direct coupling reaction of the poly (alpha-methylstylyllithium) with the deactivator was carried out to give the products.2. Fine preparation of the tetramer for -methylstirene : The monomer reacted with sodium mirror above the ceiling temperature under high vacuum. We found the most appropriate experimental condition of the preparation for the tetramer.3. Preparation of the four-arms star polymers : Two new techniques of the preparation was developed in this project : the one is carried out in the mixture of the macromonomer and excess sodium mirror, and the other is carried out in the mixture of the radical anion of the macromonomer and the macromonomer without the excess sodium mirror. Many experiments of the preparation using these techniques were performed to give the time conversion curves of the macromonomer to the tetramer and the dimer.4. The control of the consecutive first-order reaction : It is concluded that the consecutive first-order reaction of the macromonomer proceed in the preparation of the tetramer. So, two rate constsnts of the production of the tetramer and the dissociation of the tetramer were determined from the analysis. From these results, we found the most appropriate condition of the preparation for the four-arms star polymers.5. Solution properties of the star polymers : The radius of gyration of the star polymer was calculated to clarify the differences in the molecular weights and/or the second virial coefficients of the linear and star polymers.

我们总结了该项目在第一年和第二年取得的成果。末端聚合聚合物（大分子单体）的制备：将α-甲基苯乙烯进行阴离子聚合，然后将聚（α-甲基苯乙烯基锂）与失活剂进行直接偶联反应，得到产物. - 甲基苯乙烯四聚体的精细制备：在高真空条件下，单体与钠镜在上限温度以上反应。找到了制备四聚体的最佳实验条件.四臂星星型聚合物的制备：本项目开发了两种新的制备方法：一种是在大分子单体和过量钠镜的混合物中进行，另一种是在大分子单体的自由基阴离子和没有过量钠镜的大分子单体的混合物中进行。利用这些技术进行了大量的制备实验，给出了大分子单体转化为四聚体和二聚体的时间转化曲线.连续一级反应的控制：在四聚体的制备过程中，大分子单体的连续一级反应进行。因此，从分析中确定了四聚体的产生和四聚体的解离的两个速率常数。从这些结果中，我们找到了制备四臂星星聚合物的最佳条件.星星聚合物的溶液性质：计算星星聚合物的回转半径以澄清线性和星星聚合物的分子量和/或第二维里系数的差异。