聚乙烯

A dimeric catalyst is formed from titanium main catalyst and alkylauminium cocatalyst and the copolymerization catalyst is formed from metallocene catalyst and corespondent cocatalyst, and the above-mentioned both catalysts are formed into the invented double-function catalytic system which can directly make ethylene implement dimerization in same polymerization system, and at the same time, produce copolymerization reaction to form linear low-density polyethylene.

一种用于由乙烯合成线性低密度聚乙烯的双功能催化体系，二聚催化剂由钛系主催化剂和烷基铝助催化剂组成，共聚催化剂由茂金属催化剂和相应的助催化剂组成，这两种催化剂组成的双功能催化体系，可在同一聚合体系中，直接使乙烯二聚的同时就地发生共聚反应，生成线性低密度聚乙烯。

There is a difference of one between the composite of wheat straw-PE and PE. The former melting point is 131.5℃ and the latter is 132.9℃, if the apex of decalescence peak is the melting point.

麦秸与聚乙烯树脂复合后的人造板在DSC曲线中出现的熔点与聚乙烯树脂的熔点有所差别。

It was found that the solution DSC analysis can be used to investigate the detailed dissolving process of PEs.

发现在聚乙烯的良溶剂中，溶液DSC技术可以明显的观察出聚乙烯溶解的详细过程。

Chemical Engineering Institute, Qingdao University, Qingdao 266071, ChinaAbstract: The compatibility and process property of PVC/HDPE blends were studied on the basis of using vinyl chloride/ethyl acrylate copolymer as a compatibilizer, thus polyvinylchloride/(vinyl chloride/ethyl acrylate)/, ie.

以氯乙烯-丙烯酸乙酯共聚物作为聚氯乙烯和高密度聚乙烯的增容剂，研究了共混物的相容性和加工性能，在此基础上研制了聚氯乙烯/氯乙烯-丙烯酸乙酯共聚物/高密度聚乙烯合金，进而研究了合金的力学性能。

By means of the deconvolution of the MWD curves by multiple Flory functions, we found that the reason was that introducing MgF_2 into the MgCl_2 support did not change the number of active center types existed in the catalysts.

掺杂MgF_2对聚乙烯的分子量分布的影响较小，对聚乙烯的GPC曲线进行Flory最可几分布函数的分峰拟合结果表明，掺杂MgF_2对催化剂活性中心种类数没有影响。

The deconvolution of the MWD curves by multiple Flory functions showed that the broadening of MWD of PE is due to increase of types of active centers by introducing AlCl_3 into the support.

掺杂AlCl_3对聚乙烯分子量分布的影响很大，随催化剂中AlCl_3掺杂量的提高，所得聚乙烯的分子量分布显著增宽。

There are two important exceptions to this generalisation involving the use of "Haloflex" in tannic acid compositions and clear lacquers which are discussed later.

这个一般适用标准有两个很重要的例外，包括了"氯化聚乙烯"在单宁酸合成物和瓷漆中的使用。关于氯化聚乙烯在瓷漆中的使用，我们稍后在讨论。

The results indicated that the thermal stability of thepolymers is greatly associated with the structure of the modified groups.Moreover, the imide- derivatives have greater thermal stability than thecorresponding amide- derivatives. This can provide useful information on thepreparation and processing of this kind of polymers.

用PyGC-MS对酰胺型和酰亚胺型改性聚乙烯在加工条件下的热分解产物进行了定性和定量的测定，结果表明不同改性基团对聚合物热稳定性有很大影响，酰亚胺型改性聚乙烯的热稳定性大于酰胺型，这为该类聚合物的制备加工和应用提供了有用的信息。

Taking LOI and vertical burning methods as main measures to estimate the flame retarding efficiency of materials, the effects of each ingredient were studied. With the aid of thermal analysis, the mechanism of chemistry reaction, intumescence and charring were discussed.

以氧指数法和水平燃烧法作为考查阻燃性能的主要手段，研究了聚乙烯膨胀阻燃体系各组分对阻燃性能的影响，并结合热分析的方法对聚乙烯膨胀阻燃体系热降解过程的化学反应机理、膨胀机理、成炭机理进行探讨。

ABSTRACT Polyolefin materials, such as high density polyethylene , linear low density polyethylene and polypropylene have been widely used in a variety of fields because of the combination of excellent chemical and physical properties.

聚烯烃材料如高密度聚乙烯、线性低密度聚乙烯、聚丙烯等具有良好的综合性能，在热塑性塑料中是生产量最大的通用塑料材料，在国民经济中占有重要地位。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。