乙烯

EVA/LDPE/ CB conductive foam was made of EVA and LDPE as matrix,HG-1P CB and ACET CB as conductive filler,AC as foamer and DCP as crosslinker.

文章以乙烯-乙酸乙烯酯和低密度聚乙烯为主基体，特导炭黑(HG-1P)和乙炔炭黑为导电填料，偶氮二甲酰胺为发泡剂，过氧化二异丙苯为交联剂，制备了EVA/LDPE/炭黑导电泡沫复合材料。

The toughening effect of chlorinated polye thylene and nano-mete r fumed silica (SiO 2) on polyvinyl chlorid e was investigated by means of to ughness contribution rate, the mechanical properties of the composite were also studied.

传统增韧硬PVC的技术是在树脂中加入弹性体，如CPE、乙烯-醋酸乙烯酯共聚物、丁腈胶 [1] ；但增韧后PVC的性能往往出现一种或多种缺陷，如拉伸、弯曲强度下降和模量损失等，使增韧和增强成为一种矛盾体。

A one-step method for the synthesis of aromatic indolizine derivatives byintramolecular 1,5-dipolar cyclization reaction of 2-(2-arylethenyl)pyridinium N-ylidesin the presence of an oxidant has been studied for the first time. In the presence ofelectron-deficient olefins, however, 2-(2-phenylethenyl)pyridinium N-ylides underwent1,3-dipolar cycloadditions and then aromatized in situ by TPCD to produce indolizinederivatives, indicating 1,3-dipolar cycloaddition proceed more readily than 1 ,5-dipolarcyclization in these conditions. Pyridinium disubstituted N-ylides, readily obtainedfrom corresponding pridinium and β-chlorovinyl ketone, underwent thermalintramolecular 1,5-dipolar cyclization to give indolizine derivatives easily.Indolizinecarbaldehyde derivatives were synthesized starting from 2-pyridinecarbaldehyde in four-steps involving 1,3-dipolar cycloaddition reaction.

本文首次研究了2-(2-芳基乙烯基)吡啶N-叶立德在氧化剂存在下的分子内1，5-偶极环化反应，采用一锅法合成了中氮茚衍生物；研究了这些N-叶立德的1，5-偶极环化和1，3-偶极环加成反应的选择性，发现当有缺电子烯烃存在时，优先进行1，3-偶极环加成反应，而不再发生分子内1，5-偶极环化反应；由β-氯乙烯酮方便地得到了烯丙基N-叶立德，他们在加热时进行分子内1，5-偶极环化反应而得到中氮茚衍生物；由2-吡啶甲醛为起始原料，通过1，3-偶极环加成反应等四步反应，得到了重要的中氮茚甲醛衍生物，这些反应都具有条件温和和操作简便的特点，是合成中氮茚衍生物的新方法。

An improved method is provided for copolymerizing vinyl chloride with allyl glycidyl ether and a vinyl ester.

本发明提供将氯乙烯与烯丙基缩水甘油醚和乙烯酯共聚的改进的方法。

The catalyst combined with MAO or Al(i-Bu_3, AlEt_3 to form copolymerization active species, which was responsible for copolymerizing the ethylene andα-olefins to prepare branched polyethylene.

二酮锆/MAO Al(i-Bu_3、AlEt_3可以形成乙烯与α-烯烃的共聚活性中心，催化乙烯与特定链长的α-烯烃共聚得到了支化聚乙烯。

The Reaction of 1, 1-Di-p-methoxyphenyl-2, 2-dinitroethylene and 1, 1-Di-omethoxyphenyl-2, 2-dinitroethylene with BNAH 1, 1-Di (p-methoxyphenyl)-2, 2-dinitroethylene reacts with 1-benzyl-1, 4-dihydronicotinamide in deaerated acetonitrile to give 1, 1-di (p-methoxyphenyl)-2, 2-dinitroethane, while 1, 1-di (o-methoxyphenyl)-2, 2-dinitroethylene fails to react with BNAH under the same conditions.

1，1-二-2，2-二硝基乙烯和1，1-二-2，2-二硝基乙烯与BNAH的反应机理研究

The highest expression level of AtACS5::GUS fusion was detected in the 3-d-old etiolated seedlings, and the developmental expression profile of AtACS5 was not affected by the etr1-1 mutation.

在转基因拟南芥的整个生活周期中，AtACS5：：GUS和AtACS7：：GUS融合基因都具有相似的表达谱；待外源乙烯处理后，光照生长下的2周幼苗中AtACS7：：GUS的表达显著增加，而AtACS5：：GUS的表达不受乙烯处理的影响。3天苗龄的转基因黄化苗中，AtACS5：：GUS具有很高的表达水平，并且ETR1-1基因突变对AtACS5：：GUS在生长发育过程中的表达模式没有明显的影响。

A gas sensor using PEDT thin film was fabricated with the assistance of interdigitated electrodes.

采用叉指电极结构研制出了3，4-乙烯二氧噻吩薄膜气体传感器，研究了3，4-乙烯二氧噻吩薄膜气体传感器对有毒气体NO2和NH3的敏感特性以及其自身的温度特性。

The first grade is 14.7cm/kg, the fifth is 3.2cm/kg, and the sixth is lower than 2.0 cm/kg.Linked the Paull's(1996) conclusioned that the ethylene quantity was fewness at the first grade, and toped at the third to four grade, then droped rapidly, but the papaya fluit neither had the best flavor,nor became mature completely when ethylene quantity was tiptop.So we used the rigidity standard not the ethylene quantity to choose specimen.

将采后番木瓜果实按果皮颜色可分为六级，其中一级硬度为14.7 kg / cm2，六级为2.0 kg / cm2 ，结合Paull（1996）对采后番木瓜乙烯变化的结论：乙烯含量在果色破色前最微，到开始变软时达到高峰以后迅速下降，而此时番木瓜还没有达到食用风味最佳，也没有达到成熟，因此相比而言我们使用硬度为指标进行选择比较方便可行。

Immerse the asbestos screen cloth or asbestos packing in the emulsion of Polytetrafluoethylene after dry and shaped by moulding

聚四氟乙烯浸渍制品 Polytetrafluoethylene 用石棉铜丝布和或棉绊根浸渍于聚四氟乙烯乳液之中，后经干燥模压定型而成。

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。