| 1. | Long chain branched polyethylene
长支链聚乙烯 |
| 2. | Studies on ticl4 ni 2 l supported complex catalysts for ethylene polymerization to produce branched polyethylene
配体复合催化剂催化乙烯聚合制备支化聚乙烯的研究 |
| 3. | Those metallocene branched polyethylene exceed all others in basic properties with processing properties being close to the general polyethylene
开发的茂金属支化聚乙烯基本性能优于通用聚乙烯，而加工性能接近通用聚乙烯。 |
| 4. | The application experiment data show that metallocene branched polyethylene prepared by the new method are applicable to tubing and large - scale hollow container
应用试验表明，开发的茂金属支化聚乙烯可用于制造管材和大型中空容器。 |
| 5. | The long - branched polyethylenes made from these catalytic systems had the characteristics of low melt point , low density , narrow distribution of molecular weight
几种复配体系所得到的聚合物具有熔点低、密度低、分子量分布窄等特点。 |
| 6. | Metallocene branched polyethylenes prepared by oligomerization catalysts at different ratio vary in physical properties , and the ratio of cocatalyst to oligomerization catalyst of 8 . 72 : 1 gives good physical properties and processing properties
以不同配比齐聚共聚催化剂聚合的茂金属支化聚乙烯的基本物性不同，当共聚齐聚催化剂配比为8 . 72 : 1时，基本性能和加工性能较好。 |
| 7. | The crystallization and melting behavior of mellocene - catalized branched and linear polyethylenes of low molecular weight was studied . it was found that the crystalline lattice of branched polyethylene is larger than that of linear polyethylene because of the existence of branched chains . the melting behavior of branched polyethylene is similar to that of linear polyethylene since the branched chains can not enter the lattice . however , the crystalline behavior of low molecular weight branched polyethylene is the same as that of high molecular weight linear polyethylene , but different with that of low molecular weigh linear polyethylene . kinetics theory analysis evidenced that the transition temperature of growth regime of the branched polyethylene is about 20 lower than that of linear polyethylene with the same molecular weight . it may be attributed to the existence of short branched chains
研究了金属茂催化的低分子量支化聚乙烯和线性聚乙烯的结晶及熔融行为，发现支化聚乙烯的结构与线性聚乙烯相同为正交结构，但晶格略有膨胀.支链的存在对熔融行为影响不大，两种聚乙烯的熔点均随结晶温度的升高而非线性增加，表现出低分子量样品的共同特征.但支链的存在对结晶行为却有很大的影响，主要是由于支链的存在降低了晶体的结晶速率从而影响结晶过程，使得低分子量的支化聚乙烯的结晶行为与高分子量线性聚乙烯的结晶行为相似而与低分子量的线性聚乙烯不同.动力学分析表明，低分子量的支化聚乙烯的结晶生长方式的转变温度比同等分子量的线性聚乙烯降低了约20 |
| 8. | Basic properties of various polyethylene polymerized by metallocene catalysts and various branched polyethylene polymerized by oligomerization cocatalysts were researched , and the results show that metallocene branched polyethylene polymerized by oligomerization cocatalysts have high molecular weight , broad molecular weight distribution , and good tensile properties compared to metallocene - based polyethylenes prepared using mono - metallocene and bi - metallocene catalysts
摘要研究了不同茂金属催化剂聚合的茂金属聚乙烯及不同齐聚共聚催化剂聚合的茂金属支化聚乙烯的基本性能，结果表明：以齐聚共聚催化剂体系的茂金属支化聚乙烯比以单、双茂金属催化剂的茂金属聚乙烯相对分子质量高、相对分子质量分布宽，拉伸性能优良。 |
| 9. | In part 3 , the in - situ copolymerization of ethylene was investigated by the combinations of the cobalt - based catalyst and the metallocene to prepare short - branched polyethylene . the major oligomers catalyzed by the cobalt - based catalyst 5 , 6 and 7 werel - butene , and the minor were 1 - hexene . the comonomer effects were also observed
在双亚胺基吡啶钴配合物与茂金属复配催化乙烯原位共聚制备短支链支化聚乙烯中，合成了3种双亚胺基吡啶钴配合物，研究了反应条件对其催化乙烯齐聚活性和所得产物碳数分布的影响。 |
