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首页> 外文期刊>Journal of Applied Polymer Science >Copolymerization of propene with phenylnorbornene using ansa-bridged metallocene catalysts
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Copolymerization of propene with phenylnorbornene using ansa-bridged metallocene catalysts

机译：丙烯酰胺桥联茂金属催化剂使丙烯与苯基降冰片烯共聚

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摘要

Propene was copolymerized with phenylnorbornene using methylaluminumoxane (MAO)-activated metallocene dichlorides exhibiting different symmetry: C-2-Symmetric rac-ethylenebis(I-indenyl)zirconium dichloride (1), rac-dimethylsilylbis(l-indenyl)zirconium dichloride (2), rae-ethylenebis(I-indenyl)hafnium dichloride (6), C-s-symmetric isopropylidene(cyclopentadienyl-9-fluorenyl)zirconium dichloride (3), meso-ethylenebis(l-indenyl)zirconium dichloride (4), and C-1-symmetric ethylene(1-fluorenyl-1-phenyl-2-indenyl)zirconium dichloride (5) were chosen to evaluate the influence of the symmetry in copolymerization reactions. Experiments were done as batch polymerizations to produce homogeneous copolymers. By this setup, blend formation was avoided. The copolymers were characterized by NMR, GPC, and DSC. Catalysts I and 2 were the most active to copolymerize random, amorphous, copolymers with good activity. C-s-symmetric, 3, showed decreased activity compared with 1 and 2 and produced a bimodal copolymer. Catalyst 4 showed even lower activity than that of 3. The activity of the hafnium complex 6, which produced a semicrystalline polymer with a high molecular weight (116,000 g/mol) was 320 kg/mol. Catalyst I produced the highest comonomer content (42%) in the copolymers measured by NMR. The least active catalyst was 5 (phenyl croup in the bridge), producing only 290 kg copolymer per mole of catalyst. All polymers had elevated glass transition temperatures compared to polypropylene. (C) 2002 Wiley Periodicals, Inc. [References: 17]
机译：使用甲基铝氧烷（MAO）活化的茂金属二氯化物将丙烯与苯基降冰片烯共聚，所述二氯化物表现出不同的对称性：C-2-对称的rac-亚乙基双（I-茚基）二氯化锆（1），rac-二甲基甲硅烷基双（1-茚基）二氯化锆（2） ，Rae-亚乙基双（I-茚基）二氯化（（6），Cs对称异亚丙基（环戊二烯基-9-芴基）二氯化锆（3），内亚乙基双（1-茚基）二氯化锆（4）和C-1选择对称的乙烯（1-芴基-1-苯基-2-茚基）二氯化锆（5）来评估对称性对共聚反应的影响。以间歇聚合的方式进行实验以生产均相共聚物。通过这种设置，避免了共混物的形成。通过NMR，GPC和DSC对共聚物进行表征。催化剂I和2活性最高，可以使具有良好活性的无规无定形共聚物共聚。 C-s对称的3与1和2相比显示出降低的活性，并生成了双峰共聚物。催化剂4的活性甚至比3低。The络合物6的活性为320kg / mol，该complex络合物6产生具有高分子量（116,000g / mol）的半结晶聚合物。通过NMR测量，催化剂I在共聚物中产生最高的共聚单体含量（42％）。活性最低的催化剂是5（桥中的苯基团），每摩尔催化剂仅产生290千克共聚物。与聚丙烯相比，所有聚合物的玻璃化转变温度均升高。 （C）2002 Wiley Periodicals，Inc. [参考：17]

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