查询词典 ethylene

PP1740 copolymer is a multi phase copolymer,composed of homo-polypropylene,ethylene-propylene rubber,and crystallizable propylene-ethylene copolymer.Homo-polypropylene part offers rigidity and EPR part offers impact strength.The relative ...

研究结果表明，PP1740共聚物由均聚聚丙烯、乙丙橡胶和可结晶的乙丙共聚物组成，具有优良的机械性能；均聚聚丙烯为PP1740共聚物提供刚性，乙丙橡胶可提高PP1740共聚物的抗冲性能；PP1740共聚物的相对分子质量分布呈多分散性，相对分子质量分布较宽；乙丙橡胶的相对分子质量较大，以直径1～2μm球型微粒均匀分布在聚丙烯基体中，有利于提高PP1740共聚物的冲击强度；PP1740共聚物的熔点较高，耐热性好。

Production of ethylene glycol from dialkyl oxalates are also expected to be used in the industrial production of ethylene glycol.

据预测，到2010年，中国EG消费量将占世界EG消费量的26 %，占亚洲的46 %。预计到2008年我国EG总生产能力将达到约250万吨，2010年生产能力将达到约400万吨。

For the stepwise mechanism, the ethylene molecule was firstly adsorbed at the Brnsted acid site via π-hydrogen bonding to form a stable complex, which then went through the protonation, leading to the formation of the ethoxide intermediate. Furthermore, the ethoxide reacted with the second ethylene molecule to form the butoxide product.

对于分步反应机理，乙烯分子首先通过π-氢键作用在酸性位形成稳定的吸附络合物，再进一步发生质子化并生成乙醇盐中间体，随后乙醇盐与第二个乙烯分子发生碳－碳键结合形成丁醇盐产物。

Activity-stability experiment for the liquid phase alkylation of benzene with ethylene was proceeded for 2000hrs, the average values of ethylene conversion, ethyl-benzene selectivity and ethylation selectivity were 100%, 94.5% and 99.0% respectively.

进行了苯和乙烯液相烷基化的2 000 h 活性稳定性试验，乙烯转化率、乙苯选择性、乙基化选择性分别平均为100%、94.5%和99.0%。

The present invention relates to an ethylene/alpha-olefin interpolymer product comprising at least one alpha-olefin interpolymerized with ethylene and, characterized in at least one aspect, as having improved properties when utilized in a hot melt adhesive formulation.

本发明涉及包括至少一种与乙烯互聚的α-烯烃的乙烯/α-烯烃共聚体产物，其特征为在至少一方面，当用于热熔粘合剂配制剂时具有改进的性能。

The present invention relates to a polyethylene resin having a multimodal molecular weight distribution, said resin being further characterized in that it has a density in the range of from about 0.925 g/ccm to about 0.950 g/ccm, a melt index (I2) In the range of from about 0.05 g/10 min to about 5 g/10 min, and in that it comprises at least one high molecular weight ethylene interpolymer and at least a low molecular weight ethylene polymer, and a composition comprising such resin.

本发明涉及一种具有多峰分子量分布的聚乙烯树脂，该树脂进一步的特征在于它具有从约0.925g/ccm到约0.950g/ccm的密度，和从约0.05g/10min到约5g/10min的熔融指数(I 2 )，和在于它包括至少一种高分子量乙烯共聚体和至少低分子量乙烯聚合物，以及包括这样树脂的组合物。

The results showed that molar ratio of cyclohexanone to ethylene glycol was 1∶1.4, the amount of catalyst was 2% cyclohexanone, amount of cyclohexane was 10 mL, the reaction time 2 h, the yield of cyclohexanone ethylene ketal reached 99.6% under the optimum condition.

通过正交实验得出了最佳反应条件：n∶n=1∶1.4、催化剂用量为环己酮质量的2%、带水剂环己烷用量10.0 mL、反应时间2 h，缩酮产率可达99.6%。

A study of Chemically Induced Dynamic Poiarization spectra is made, using a highly time resolved ESR, of photolized anthracenequinone radicals to determine the influence of surfactant micelles on the spin polarization of anthracenequinone anion. It is found that the CIDEP mechanism of photolization is mainly the radical pair mechanism of anthracenesemiquinone radical and of ethylene glycol ketyl R〓〓 or R〓 radical whose center is carbon in anthracenequinone/ethylene glycol system, but there is a certain amount of triplet state mechanism polarization.

分别研究了胶束和微乳液的&笼效应&对蒽醌和苯醌的光解CIDEP的影响，其结果如下：(1)对于蒽醌的CIDEP，在乙二醇溶剂中，极化的蒽醌自由基AQ〓和R〓自由基通过光解经过夺氢反应产生，其CIDEP机理主要是自由基对机理，但也包含了一部分三重态机理。

To explore the relationship between ethylene and ethylene receptor genes in different developmental stages of wild type tomato（Lycopersicon esculentum Mill cv.

为研究野生型番茄（Lycopersicon esculentum Mill。

Gerbera plantlets in 125 ml flask received 0, 2.5, 5, 10, 20 ppm Ethrel and 0.01, 0.1, 1 mM 1-aminocyclopropane-1-carboxylic acid to study the effect of ethylene and ethylene biosynthesis through cultured in vitro. The good quality plantlets which had more adventitious roots, no overgown stem, no etiolated plantlets by the addition of 5, 10 ppm Ethrel.

非洲菊(Gerbera jamesonii， Bolus)幼苗於试管内处理以0， 2.5， 10， 20 ppm的益收素及0.01， 0.1， 1 mM的环丙烷氨基羧酸(1-aminocyclopropane-1-carboxylic acid， ACC)以研究乙烯对试管苗之影响及乙烯生合成，结果以5及10 ppm的益收素处理能得到良好品质的苗，为多侧根不徒长，不白化的幼苗。

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。