查询词典 polymerization

A cinchonine imprinted monolithic polymer was directly prepared in a fused capillary column by in-situ polymerization.

借助于提高流速和使用梯度洗脱在其上实现了快速手性分离。

And VTMS is added in late stage of polymerization, in this situation the system has the lowest coagulum. When the hydroxyl value of such polymer increases, the coagulum decreases; and solid content of such polymer increases, the coagulum increases greatly, so it is difficult to get higher solid content emulsion.

采用正交实验方法，通过对有机硅改性丙烯酸乳液聚合过程中凝聚物含量、乳液粘度影响的研究，确定的最佳的反应条件是：以SLS/OP为乳化剂、比例为4/6、用量为2％、丙烯酸单体的用量1.5％、反应温度为75℃、改性剂VTMS用量是1.5％、改性剂后加入方式下聚合反应过程中有最低的凝聚物含量。

In this paper, three kinds of hydroxyl component are prepared for two-component waterborne polyurethane paint, that is, acrylic dispersion, acrylic emulsion and silicone-modified acrylic emulsion. The influence of the composites of these dispersion and emulsions on polymerization process, viscosity, particle size and coagulum are investigated, infrared spectroscopy , inductance coupling plasma , transmission electron microscopy and thermogravimetric analysis are used to characterized their structure, composite, morphology and thermal stability, respectively.

本论文制备了三种用于水性双组分聚氨酯涂料的含羟基组分，即丙烯酸分散体、丙烯酸乳液和有机硅改性丙烯酸乳液，研究了这些分散体和乳液在制备过程中聚合物的羟值、酸值、玻璃化温度、乳化剂、反应温度等对聚合转化率、凝聚物含量、聚合物粘度和粒径的影响，用红外光谱、热重分析、透射电镜和感应偶合等离子技术表征了其结构、组成、形态和热稳定性。

As references, conventional surfactant sodium dodecylsulfate or the mixture of surfactants sodium dodecylsulfate and nonylphenol polyoxyethylene ether (10) is used in the same polymer systems. Large amount of coagulum is producted during the polymerization, when the polymerizable surfactant from series A is used.

传统乳化剂十二烷基硫酸钠或十二烷基硫酸钠与壬基酚聚氧乙烯醚(10)(NP-10)复配的乳化剂也同样用于聚合以作对比。A系列乳化剂产品产生了大量凝胶，不适宜用于本文研究的乳液聚合中。

More levels of nano-SiO〓 lead to larger particle size. An increase in polymerization reaction temperature causes the decrease in coagulum and increase in viscosity and particle size, and the nano-SiO〓 has same effects at certain temperature. When the levels of hydrophilic monomer acrylic acid and hydroxylethyl methacrylate in core composite are increased, the particle size of emulsifier-free emulsion decreases, in spite of the presence of nano-SiO〓.

无皂乳液具有单分散性好、表面洁净、成本低廉、不影响产品性能的特点，首次研究了含或不含纳米粒子的含羟基和羧基的丙烯酸无皂乳液聚合，发现含或不含纳米粒子的无皂乳液聚合后的粒子粒径较大，具有单分散性；较多的纳米粒子导致较大的乳液粒径；反应温度升高，凝聚物含量下降，而乳液粘度和乳胶粒粒径增加，在相同的反应温度下，纳米粒子降低了聚合过程中的凝聚物含量，增加了乳液聚合物的粘度和粒径；不论纳米粒子是否存在，当无皂乳液核组成中亲水单体AA和HEMA用量增加时，乳胶粒粒径均减少。

When the sodium lauryl sulfate and p-octyl polyethylene glycol phenyl ether is used and its level in 3% and 6: 4 ratio, the polymerization process has the lowest coagulum and the highest monomer conversion. Higher reaction temperature and more level hydroxyl value lead to more coagulum, the latter also lead to larger particle size. The acid value has larger influence on viscosity and coagulum, there exist a best range. The emulsion particle size is larger for its hydrophilicity, most of its particles are connected together.

在含较高亲水单体的乳液聚合体系中，难以制得稳定的预乳化液，不能采用工业生产中常用的预乳化工艺，而只能采用混合单体直接滴加的方法；由于单体混合物的亲水亲油值较高，用阴离子型乳化剂十二烷基硫酸钠和非离子型乳化剂聚乙二醇辛基苯基醚混合，用量为单体总量的3％，且比例在6：4时，乳液聚合时具有最低的凝聚物含量和最高的单体转化率；乳液聚合反应温度升高，可以提高单体转化率，增加反应速度，但凝聚率相应提高；随着羟基单体含量的增加，聚合过程中凝聚率增加，聚合物乳胶粒平均直径增加；羧基单体有一个最佳的用量（2.6％），过高或过低凝聚率均提高；羧基含量对乳液的粘度有较大的影响，当羧基含量较低时，羧基含量增加，乳液粘度增加明显；含羟基乳液粒子由于含亲水基团较多，使得乳胶粒径增大，乳胶粒子大多数互相凝聚在一起，处于凝聚态。

An acrylic cathodic electrodeposition paint based on the solution polymerization of glycidyl methacry-late and normal acrylic monomers has been developed, which has overcome the shortcomings of epoxy - polyurethane CED paint and featured by its good colorability, decoration and weatherability.

介绍了采用甲基丙烯酸缩水甘油酯与常用的丙烯酸单体通过溶液聚合，制备丙烯酸阴极电泳漆的简单可行方法。研制的电泳漆克服了环氧-聚氨酯阴极电泳漆的缺点，具有可着色性、高装饰性、高耐候性等特点。

The results show nano-scale emulsion, stable polymerization and good performances if the SLS is mixed with OP at mole ratio of 2 to 1; the amount of compound emulsifier is 4% and the solid content of emulsion is 40%.

结果表明，当乳化剂为SLS/OP复合乳化体系、其物质的量的比为2∶1、乳化剂用量为4%、乳液固体含量为40%时，可以得到纳米尺度的苯丙乳液，聚合反应稳定性和乳液性能良好。

The compositions include at least one polymerizable aryl acid compound, an effective amount of a polymerization initiator, and at least 10 percent by weight of ceramic, metal and/or metal oxide filler particles having a particle size less than 500 microns.

组合物含有至少一种可聚合的芳基酸化合物、有效量的聚合引发剂以及至少10％其粒径小于500μm的陶瓷、金属和／或金属氧化物填充料颗粒。

According to the regular condensation polymerization principle, a certain amount of amino terminated polyether D230 and a certain amount of divinyl three amine are mixed uniformly by water, and then a certain amount of hexanedioic acid is added in and stirred for dissolving.

本发明属于工业水处理技术领域，具体涉及一种抑制水中二氧化硅/硅酸盐垢沉积的非离子型聚合物及其制备方法，该聚合物是一种含具有醚键、仲胺键、肽键结构的非离子型共聚物，具体为己二酸/端氨基聚醚/二乙烯三胺共聚物，按照常规的缩聚反应原理，首先用水将一定量的端氨基聚醚D230和一定量的二乙烯三胺混合均匀，然后加入一定量的己二酸并搅拌使其溶解。

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！