查询词典 polymerization

Both a reversion and an increase of the absolute value of specific rotation in the transformation from MALM to PMALM- b -PSF- b -PMALM were observed,which were probably caused by some kind of stereostructure of the main chain formed during the polymerization due to the intermolecular hydrogen-bonding.

共聚物在聚合过程中旋光度发生了反转，且比单体的旋光度的绝对值显著增加，这可能是由于聚合过程中分子主链感应出了手性的二级结构诱导出手性放大效应引起的。

A catalytic amount of Ln(OSO2CF3)3 affected the stereochemistry of-MOPMAM during radical polymerization: the polydispersities of the polymers prepared in the presence of the Lewis acid were broader than those without the Lewis acid and the absolute value of specific rotation decreased in a majority of solvents.

结果表明，在-MOPMAM的聚合反应中，加入稀土盐可观察到明显的效应：在大部分情况下，随着三氟甲磺酸稀土盐加入量的增加，聚合物分子量分布变宽，旋光度也有很大幅度的下降。

In this paper, the kinetics of minisuspension polymerization of vinyl acetate was investigated.

本文主要对微悬浮法合成聚醋酸乙烯酯的动力学进行了研究。

This paper reviews the preparation and characterization of polymers containing cholic acid obtained by free radical polymerization, polymers modified with cholic acid and polycondensation of cholic acid, etc. The development of polymers containing cholic acid in the future is also forecasted. Contents

本文从自由基聚合形成的含胆酸高分子化合物、胆酸修饰的高分子化合物和胆酸聚合物等几个方面综述了含胆酸高分子化合物的制备和特性，并对胆酸在高分子材料方面的新用途作了展望。

The preparation of polymer/montmorillonite intercalation composite materials has been studied by applying two kinds of photo polymerization reaction (photo acid generation and photo radical generation)in this work.

用小角X光衍射技术对产物内蒙脱土的结构进行表征，结果表明，蒙脱土经改性后能很好地使聚合单体及预聚物插入黏土层内并在光照下"就地"聚合生成光聚合复合材料。

Methacrylic acid-acraldehyde/ montmorillonite nanocomposites were prepared using Na+- montmorillonite via in-situ polymerization of methacrylic acid and acraldehyde in aqueous medium.

采用水溶性聚合单体甲基丙烯酸和丙烯醛在钠基蒙脱土层间直接原位插层聚合制备水溶性MAA-AL/MMT纳米复合材料，通过XRD和TEM对纳米复合材料的结构进行表征，采用TGA、DSC研究了纳米复合材料的热性能，同时考察了甲基丙烯酸与丙烯醛配比及体系pH值对纳米复合材料结构及应用性能的影响。

It wasfound that the kinetics formulas of these photo-polymerization systemsdeviated from the normal kinetics formula sharply and there existed acritical concentration of 〓, the reaction rate would descendwhen the concentration of 〓 exceeded it.

我们发现这些光聚合反应的动力学方程与正常的动力学方程偏离较大；并首次报道了当〓的浓度达到某—临界值时，反应速率随着〓浓度的上升反而下降的现象。

In this study, several kinds of acrylate polymer dispersants were synthesized by radical aqueous solution polymerization.

本文采用水溶液自由基聚合的方法，合成了几种不同的丙烯酸系高分子分散剂。

Effects of three feeding methods on siloxane modified acrylate emulsion polymerization stability and properties of emulsion were studied.

研究了3种单体投入方式对有机硅改性丙烯酸酯乳液聚合稳定性及性能的影响。

Synthesis of tricyclopentadiene Two methods of polymerization were analyzed in the synthesis of TCPD: thermal polymerization of DCPD, Diels-Alder reaction of DCPD and cyclopentadiene.

三环戊二烯的合成采用两种方式对TCPD的合成进行了研究：DCPD直接热聚法、DCPD与环戊二烯双烯加成法。

It seems likely that Kraft will return with a better offer.

看起来卡夫要重新考虑一个更好的出价了。

But he'd rather burn off my feelers and watch me squirm.

可他却放任那个家伙对我为所欲为！