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请高手将下面两段话翻译成汉语。非常谢谢！ The effect of productivity decreasing could be explained by the formation of larger organoaluminate counteranions. They would constitute abarrier to ethylene access to the nickel center. Further studies with variations in the quantities of the nickel complex and alkylaluminum cocatalysts will be made in the future. The polymerization of ethylene by the system 1/alkylaluminum produces branched polymers(see the next section, Polymer Characterization). The behavior of this system has been interpreted by a mechanism comprising “migration” and“propagation” as introduced by Fink et al.18 or “chain walking” according to Brookhart et al.19 Figure 1 shows the main features of such a process. The propagation is a sequence of olefin insertion, and the branching formation is originated through an isomerization process. Thissequence of isomerization steps (b-hydride elimination/insertion) without chain transfer, the so-called chain walking, followed by ethylene insertion distinguishes nickel catalysts from the majority of other olefin polymerization catalysts described nowadays. These results have been explained well by theoretical simulations20 and experimentalwork. |
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madeli333(金币+2, 翻译EPI+1): 2010-12-12 10:18:50
cfk580713(金币-1):虽然lz自己说了是在线翻译 但是最好还是不要有太明显的机译痕迹吧 2010-12-12 12:13:41
madeli333(金币+3): 2011-01-03 09:53:36
madeli333(金币+2, 翻译EPI+1): 2010-12-12 10:18:50
cfk580713(金币-1):虽然lz自己说了是在线翻译 但是最好还是不要有太明显的机译痕迹吧 2010-12-12 12:13:41
madeli333(金币+3): 2011-01-03 09:53:36
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在线翻译：自己在调整一下句子语序不就得了 生产力的影响减少都可以解释为更大的离子organoaluminate形成。他们将会导致abarrier乙烯进入镍中心。进一步的研究,以变化的数量相对uminum镍复杂和alkylal将在未来。乙烯聚合系统1 / alkylaluminum生产分枝的聚合物(见在下一章节,高分子鑑定)。 该系统的行为把机制包括“迁移”和“传播”等了al.18或“链护照行走”根据al.19小溪鹿等主要特征图一显示了这样的一个过程。传播是一系列烯烃插入和分支的形成是由通过异构化的过程。该序列的异构化步骤(b-hydride消除/介入)没有链转移,所谓链行走,其次是乙烯插入不同于多数人的催化剂镍系烯烃聚合催化剂描述的功能。这些结果已经解释清楚,通过理论和实验工作20模拟。  |
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2010-12-12 11:16
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2010-12-12 11:20
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