苯乙烯

A new functional electroluminescent copolymer is reported in which chromophores and hexa segments alternate along the polymer backbone.

采用Wittig反应合成了一种分子主链由烷氧基取代的1，4二苯乙烯基苯聚对亚苯基亚乙烯基(PPV的三个单元的齐聚物与柔性隔离链段五缩六乙二醇组成的交替型蓝绿色发光共聚物。

Two kinds of high alcohol acrylates were prepared by octadecyl alcohol and hexadecyl branched alcohol,respectively.The polymers of depressants were prepared by maleic anhydride-styrene-higher alcohol acrylates.By using these depressants,the pour points of the Liaohe crude oils were lowered form 30℃ to 20℃.

分别采用碳十八直链醇、碳十六支链醇与丙烯酸合成烷基酯，将烷基酯再与顺丁烯二酸酐、苯乙烯聚合制备的三元共聚物，对辽河油田的高凝原油的降凝效果进行了评价，实验发现这两种聚合物对凝固点为30℃原油都具有较好的效果，降幅可达10℃左右，但对凝固点为41℃的原油较差分别为3℃和6℃。

A novel non - metallocene supported catalyst, CpTiCl2/MgCl2 - SiO2/ MAO ,was prepared, and the catalysis involved in ethylene homo - polymerization, ethylene - 1 - hexylene and ethylene - styrene copolymerization was investigated.

研究开发了一种新型非茂负载聚烯烃催化剂——CpTiCl2/MgCl2-SiO2/MAO，并考察了该催化剂的乙烯均聚、乙烯和1-己烯共聚及乙烯和苯乙烯共聚性能。

Attachs most importance to a dot with circular economy, inferior group of nation chemical industry is accelerated implement project of 120 thousand tons of suitable anhydride, will deputy produce steam 1.3 million tons, besides for private use still will 600 thousand tons supply garden area other plant, but energy-saving mark coal 140 thousand tons; Project of 450 thousand tons of styrene deputy produce hydric 6000 tons, but section report 3.3 million kilowatt hour.

以循环经济为重点，亚邦化工集团加快实施12万吨偏苯三酸酐项目，将副产蒸汽130万吨，除了自用还将有60万吨供应园区其他工厂，可节能标煤14万吨；45万吨苯乙烯项目副产氢气6000吨，可节电330万千瓦时。

Effect of several collectors on fersmite artificially synthesized under the condition of variable pH values and dosages were studied. The collecting characteristic of several representative collectors such as benzyl arsionic acid,α-styrolphhosphonic, diphosphonic acid, cyclic alkyl hydroximic acid and C(subscript 7-9) alkyl hydroximic acid was researched.

研究了几种捕收剂在不同pH值和不同用量条件下对人工合成的铌钙矿的捕收效果，考察了苄基胂酸，苯乙烯膦酸，双膦酸，环烷基异羟肟酸，C(下标 7~9)烷基异羟肟酸等几种代表性的捕收剂的捕收性能。

1Five novel E-(4-β-D-allopyranosyloxyphenyl)-1-(4-substituted phenyl) propenone derivatives were designed and synthesized by the Claisen-Schimidt reaction with 4-substituted hypnone.

1与4-取代苯乙酮进行Claisen-Schimidt缩合，合成了五个未见文献报道的E-4-β-D-吡喃阿洛糖苷-苯乙烯基-4-取代苯酮衍生物。

Due to great amount of double bond on rubber chain,a lot of intramolecular reaction occurred in the system,which made the uncontrolled cross-linked system into a controlled cross-linked copolymerization,resulting in chain growth can't go illimitably in cross-linking process.

苯乙烯和二乙烯苯共聚体系是典型的不可控制的交联聚合体系，加入天然橡胶后，通过阳离子聚合方法，生成三元共聚物线团，由于橡胶分子链上含有大量的双键，聚合体系中能进行分子内反应，使不可控的交联聚合体系成为可控的交联聚合体系，其链增长不能无限制进行，从而可以合成可溶解的交联的聚苯乙烯-二乙烯苯-天然橡胶聚合物。

Comparative study of the properties of both ground and excited states of metal-free indoline dyes for dyesensitized solar cells revealed: as the number of rhodanine rings increases, the energy difference between HOMO and LUMO decreases and there is a red shift in the absorption spectrum with the binding energy increased, and the transition dipole moment decreased; Based on an analysis of cha...

对比研究吲哚染料的基态和激发态性质，揭示了随着绕丹宁环数目的增加，HOMO和LUMO的能量差减少，吸收光谱红移，但是束缚能增加，跃迁偶极矩减少；依据电荷差分密度，电荷和能量从苯乙烯转移到吲哚环和绕丹宁；电子空穴相干性主要表现在吲哚环和绕丹宁环，对于吲哚染料系统，存在一个绕丹宁环的体系的激子数目为30个原子，带有两个绕丹宁环的体系激子数目有40个原子。

Palladium loadings of 1.39%, 3.0%, and 5.85% showed high activity and selectivity in the Heck coupling of iodobenzene with styrene (conversions of 76-84%, selectivities of 84-87%) and methyl acrylate (89-100% conversions and 100% selectivities).

钯全部1.39%、3.0%、和5.85%的表现高活性、选择性与苯乙烯啥米耦合碘(1976年至1984年改建成选择性84-87%)和甲基丙烯酸(89-100转换成选择性和100%)。

The synthesis of a novel rotaxane containing α-CD(α-cyclodextrin) as the macrocycle,stilbene as the 'string' and the isophthalic acid as stopper via a palladium-catalyzed Suzuki coupling reaction in water at room temperature and supramolecular self-assembly was reported.

通过醋酸钯催化的Suzuki偶联反应，在室温下于水溶液中通过超分子自组装制备了以α-CD为大环，异酞酸为端塞，二苯乙烯衍生物为链的新型超分子轮烷。

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。