Ruchatz D, Fink G
Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany.
Macromolecules. 1998 Jul 28;31(15):4681-3. doi: 10.1021/ma971043b.
The copolymerization parameters of the ethene-norbornene copolymerization using various metallocene and half-sandwich catalysts were determined on the basis of composition data with linear graphical methods: Aside from r1 and r2, values for r11 and r21 could be determined in the case of alternating copolymerizations. In this connection, r21 differs significantly from catalyst to catalyst and reflects the different tendency of each catalyst to produce copolymers with an alternating monomer sequence. The maximum norbornene contents in the copolymer could be achieved by use of sterically less hindered metallocene catalysts. As an exception to this, the half-sandwich catalysts produced copolymers with surprisingly low norbornene contents.
使用各种茂金属和半夹心催化剂进行乙烯-降冰片烯共聚反应的共聚参数，是基于组成数据采用线性图解法确定的：除了r1和r2之外，在交替共聚的情况下还可以确定r11和r21的值。就此而言，r21因催化剂不同而有显著差异，反映了每种催化剂生成具有交替单体序列共聚物的不同倾向。通过使用空间位阻较小的茂金属催化剂，可以实现共聚物中降冰片烯的最大含量。与此不同的是，半夹心催化剂制备的共聚物降冰片烯含量出奇地低。
