醚

By using polymerizable surfactants, the stability of the latex and water resistance of the film can be improved. Sodium monoalkyl maleates polymerizable surfactants, sodium monoalkylpolyoxyethylene maleates polymerizable surfactants and N-methyl-N-monododecylfumaroyl taurine polymerizable surfactants are synthesized, by using normal fatty alcohols, alkyl poly ether and maleic anhydride.

以直链脂肪醇、脂肪醇聚氧乙烯醚和马来酸酐为起始原料，设计合成了马来酸单脂肪醇酯钠盐A系列、马来酸单脂肪醇聚氧乙烯醚酯钠盐B系列、N-甲基-N-脂肪醇单酯富马酰基-牛磺酸钠D系列的可聚合乳化剂。

Adopting condensation copolymerization between alkylphenol polyoxyethylene ether and methyl aldehyde and using concentrated sulfuric acid sulfonation, which it with sodium hydroxide neutralization, finally acquired sulphonate anionic surfactant, utilize as temperature resistance 、mineral salt tolerance for heavy oil viscosity reducer , research on the performance evaluation, the result indicate, the amount of sulphonate anionic surfactant to be used at 0.2wt%, viscosity reducer rate reached 92.1%; added with 0.5wt%, the calcium and magnesium ions resistance in mineral water up to 800mg/L.

采用辛基酚聚氧乙烯醚和甲醛的共缩聚物与浓硫酸磺化后，再用氢氧化钠中和后得到磺酸盐阴离子表面活性剂作耐温抗矿盐稠油降粘剂，并对其进行性能评价，结果表明，辛基酚聚氧乙烯醚甲醛共缩聚物磺酸盐阴离子表面活性剂加量为0.2wt%时，降粘率高达92.1%，抗钙、镁离子能力达800mg/L。

The influences of hydroxyethyl methyl cellulose and carboxymethyl cellulose on performances of plaster for aerated concrete have been researched in the paper.

主要研究了羟乙基甲基纤维素醚和羧甲基纤维素醚对加气混凝土用抹灰砂浆性能的影响。

Because a part of hydroxyl group in methyl cellulose were substituted by trimethylsilyl group , the product could be dissolved in amounts of common organic solvents, such as chloroform, xylene and so on.

通过甲基纤维素与六甲基二硅亚胺的反应，成功地实现了对水溶性物质甲基纤维素醚三甲基硅化的改性；红外光谱验证了反应的发生，核磁共振氢谱确定了三甲基硅甲基纤维素的取代度；纤维素醚上的部分羟基被三甲基硅化后取得了在普通溶剂中的良好的溶解性，且随着取代度的增加，在非极性溶剂中的溶解性逐渐变好；通过热失重实验，对其热稳定性进行了测试。

Objective The toxicity and synergism of several commonly used insecticide mixtures,and DDVP mixed with synergists,to the larvae of DDVP-resistant Culex pipiens pallens were detected to delay the development of mosquito resistance to insecticides.

目的 为延缓抗性的发展，测定了淡色库蚊幼虫DDVP抗性品系对常用的几种杀虫剂混用后的敏感性及与增效剂氯化胡椒基丁醚(S1)、八氯二丙醚(S2)和增效胺混用的效果。

The result showed that chromatogram peaks were summated,peak area increased and two new peaks were found.It suggested that the composition dissolution of RP was increased with the addition of RAT,chemical changes may be occurred after compatibility. Established the HPLC analysis method forα-asarone in RAT and researched the content change ofα-asarone after compatibility.

发现配伍后色谱峰具有加和性，峰面积增加，有两个新峰产生，提示石菖蒲能使远志中的化学成分溶出度增加，两药配伍后可能发生了复杂的化学变化；建立石菖蒲中α-细辛醚的HPLC分析方法，研究配伍远志后α-细辛醚的含量变化。

Examples of suitable polar volatile liquid are amines ethers especially lower alkyl ethers organic acids esters ketones glycols alcohols amides ureas sulphoxides sulphones and water.

合适的极性挥发性液体的例子有胺，醚，尤其是低级烷基醚，有机酸，酯类，酮类，乙二醇，乙醇，酰胺，尿素，sulphoxides，砜和水。

Two series of polys and polys were synthesized by solution polycondensation of 4,4'-difluorodiphenyl sulfone and 4,4'-difluorobenzophenone, respectively, with various bisphenols in the presence of cesium fluoride.

二系列聚醚碸和聚醚酮分别由 4，4'-difluorodiphenyl sulfone 与 4，4'-difluorobenzophenone和五种不同之二酚在CsF的存在下经由溶液聚缩合法制得。

A migration detection method for 9 bisphenol type chemicals from food contacting materials was developed by using deionized water,3％ acetate acid solution,10 ethanol solution and refined olive oil as four food simulants. The chemicals included bisphenol A,bisphenol A diglycidyl ether,bisphenol F diglycidyl ether,and their derivatives.

选用去离子水、3%乙酸溶液、10%乙醇溶液和精制橄榄油作为4种食品模拟物，开展了食品接触材料中双酚A，双酚A二甘氨酸醚、双酚F二甘氨酸醚及其衍生物等9种双酚类物质迁移检测方法研究。

We found that the iodohydroxylation of 1-2-allenyl selenides with I〓 and water can smoothly proceed in aqueous MeCN at 0℃.

我们发现在乙腈水溶液中，1，2-联烯基硒醚可以和碘发生羟碘化作用，碘和羟基高度区域和立体选择性加成到1，2-联烯基硒醚的β，γ-位。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。