中文摘要：

长链支化聚乙烯（LCB-PE）在聚乙烯链上含有长链的支化结构，因此具有优异的流变性能，从而改善了聚合物的加工性能，这是其它结构聚乙烯所不能比拟的。长链支化聚乙烯的制备方法有辐照法、茂金属共聚法和聚丁二烯加氢法等，本文综述了各种方法的基本原理和优缺点。辐照法制备LCB-PE的优点是比较简便，容易实现工业化生产，但也有制备的LCB-PE结构不明确，高能辐照对设备要求较高的缺点。茂金属共聚法制备的LCB-PE结构较明确，制备过程较易控制，但由于茂金属催化剂的专利问题而不易推广。聚丁二烯加氢法制备的LCB-PE其主链长度、支链长度和支链密度都可控，但过程较复杂，成本高，不易推广。

英文摘要：

Due to its long chain structure, long chain branched polyethylene （LCB-PE） shows much excellent rheological behavior than the other polyethylene structure and can be used to modify the polymer process. Now, radiation, metallocene catalysts and hydrogenation of polybutadiene methods were used to prepare LCB-PE. In this paper, the principle, advantage and disadvantage of each method were reviewed. The radiation method can be easily applied in the industry scale. But the detail structure of the LCB-PE is hard to be characterized, and the equipment is highly requested to resist the high energy radiation. The preparation process of LCB-PE by metallocene catalysts can be easily controlled, and the LCB-PE can be characterized clearly. However, the technology is hard to application in China because the patents about metallocene catalysts. The LCB-PE prepared by the hydrogenation of polybutadiene method is well-controlled and well-defined, the length of main Chain and branch chain and the density of branch all can be controlled, but he produce is too complex and the cost is too high.