苯乙烯

A new type of difunctional initiator (benzyl dibromide, ethyl dibromoacetate) was proposed in this paper and used to synthesize poly based triblock copolymers such as PSt-PBA-PSt, PMMA-PBA-PMMA.

本论文提出一种新型ATRP双官能团引发剂(如α，α-二溴化苄、α，α-二溴乙酸乙酯)，并用聚合反应速度法、GPC法、核磁分析法进行双官能度的验证，并通过两步聚合合成以聚丙烯酸酯为中间嵌段、苯乙烯或甲基丙烯酸甲酯为两端嵌段的ABA型三嵌段共聚物。

The result shows that both of the two C-C double bond are exist as a trans configuration. The dihedral angle between benzene ring was 24.6°and 37.5°respectively.

发现均二苯乙烯荧光团的两个双键都是以反式结构存在，并且分子中的苯环并非完全共平面，相邻苯环之间的夹角分别为24.6°和37.5°。

The results of dimerization of α-methylstyrene indicate that no products were detected at room temperature and it is benefieial to the reaction to raise temperature .

同时，α-甲基苯乙烯的二聚反应表明，室温下不发生反应，提高温度有利于反应进行。

Perhaps this is relevant to emodin and diphenyl ethylene glucoside which are the main ingredients included in the herb.

何首乌具有延年益寿，抗衰老作用，可能与其所含的主要成分大黄素、二苯乙烯苷有关。

Objective:To investigate the effects of Emodin and diphenyl ethylene glucoside on antioxidation of Radix Polygoni Multiflori at molecular lever.

目的：从分子水平研究何首乌中主要成分大黄素、二苯乙烯苷的抗氧化作用。

A copolymer emulsion used for air filter paper impregnation was studied, the emulsion was prepared by copolymerization of styrence/bulyl acryl ate and oxidized starch using sodium bisulphate/potassium per sulfate as initiator and sodium doddery sulfate as emulsifier.

摘 要：采用半连续乳液聚合的方法，以亚硫酸氢钠-过硫酸钾为引发剂，十二烷基硫酸钠为乳化剂，合成了一种以氧化淀粉、苯乙烯和丙烯酸丁酯为主要原料的空气滤清器滤纸浸渍乳液。

Strips tested:Printing ink to AS , PS , PET of It is relatively good to adhere to degree , PE and PP It is more difficult to adhere to, Need to increase its surface dyne to increase and adhere to degree.

三、剥离：油墨对苯乙烯、聚苯乙烯、聚酯的附著是较佳；对於聚乙烯、聚丙烯是较不易附著，需增加其表面达因数来增加附著度。

The material elastic modulus and yielding limit stresses at the temperatures of 25℃,30℃,40℃ and 50℃ are determined according to the results of tensile tests.

对苯乙烯基形状记忆聚合物进行了拉伸实验研究，测定了该材料在25℃、30℃、40℃和50℃时的弹性模量和屈服极限。

Small and uniform particles (5-15 um) of GDX 101 resins can be obtained by grinding with a colloid mill and elutriating with a home-made solvent elutriation device.

GDx 101是苯乙烯和二乙烯基苯的共聚物，具有强吸附性能，耐腐蚀，且无流失现象，已被广泛用作气相色谱固定相。

The emulsoid particle size and its distribution were determined by dynamic laser scattering and TEM. The composition changes of ACR were inspected by IR, and the core-shell structure was observed by TEM.

该共聚物是通过在适度交联的丙烯酸丁酯-丙烯酸2-乙基己酯共聚物乳胶粒外层包裹上一层甲基丙烯酸甲酯-苯乙烯共聚物而形成的。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新