查询词典 polymerization

New contributions of this work are as follows:(1). Preparation of Spherical MgCl_2-Supported Late-Transition Metal Catalysts for Ethylene PolymerizationFacile and effective immobilization of late-transition metal catalysts. 2,3-bis-(2,6-diisopropylphenyl) butane diimine nickel dibromide (1) and 2,6-bis-[1-(2,4,6-trimethylphenylimino)ethyl]pyridine iron dichloride (2), for ethylene polymerization has been achieved, using spherical MgCl_2 supports obtained by thermal dealcoholization of MgCl_2·2.56C_2H_5OH, and the effects of dealcoholization temperature on supported late-transition metal catalysts and the properties of resultant polymers were studied, the results indicated that:1.Supports with appropriate mechanical strength, high surface area and high porosity could be prepared by thermal dealcoholization of spherical MgCl_2·2.56C_2H_5OH supports; 2.BET, XRD, IR, SEM, GPC and DSC analyses indicate that the activities of the supported late-transition metal catalysts and the properties of resultant polymers are strongly dependent on the dealcoholization temperature.

本工作的新贡献如下：(1)、球形氯化镁负载后过渡金属催化荆催化乙烯聚合本文将配合物2，3-双(2，6-二异丙基苯亚胺)丁烷二溴化镍(1)和配合物2，6-二[1-(2，4，6-三甲基苯亚胺)乙基]吡啶二氯化铁(2)分别直接负载于经不同热脱醇温度处理的球形氯化镁载体上，研究了氯化镁载体的脱醇温度对负载化后过渡金属催化剂及其聚合物的影响，研究表明：1、通过对球形MgCl_2·2.56C_2H_5OH载体进行热脱醇处理，可以获得合适机械强度、较高比表面积和较高孔隙度的球形氯化镁载体；2、BET，XRD，IR，SEM，GPC和DSC研究表明，脱醇温度极大地影响负载后过渡金属催化剂的活性和聚合物的性能。

The polymer carriers,the immobilization of rare earth compounds,the properties of polymer-supported rare earth metal complex es and their catalytic characteristics in the polymerization of diene was reviewed with 25 references.

对聚合物载体的合成、稀土金属化合物的固定和聚合物载体－稀土金属络合物的性质及其催化双烯烃聚合的特征进行了论述。

The hazards induced by excessive dissolved oxygen in beer mainly covered producing colloid turbidity, advancing the oxidation and polymerization of polyphenols, increasing diketone content, damaging the aroma and bitterness of wort, producing aging taste etc.

溶解氧过量对啤酒产生的危害主要有：①促使啤酒胶体浑浊；②促使多酚物质氧化、聚合；③使连二酮回升；④破坏酒花的香味和苦味；⑤产生老化味等。

At first, the polymerization characteristic of BMA was discussed in the paper, by contrast with MMA, using the instrument dilatometer. It was confirmed that the polymerizing activity of BMA was lower than MMA, and its polymerizing condition was stricter.

本文首先对甲基丙烯酸丁酯和甲基丙烯酸甲酯的聚合特性进行了对比研究，用膨胀计法测定了两者在不同引发条件下的聚合动力学，证实了甲基丙烯酸丁酯的聚合活性比甲酯要低，聚合条件更为严格。

In this paper,the synthesis of Talc/PMMA graft copolymer is studied,and the apparent kinetic test conducted by dilatometer. The effects of the initiator's concentration, the monemor's content, the talc's content and the reaction temperature on polymerization rates were investigated,and the apparent activation energy was determined.

文章主要研究了滑石粉／PMMA接枝物的合成和表观动力学测试，采用膨胀计法研究了接枝聚合反应表观动力学，探讨了引发剂浓度、单体用量、无机微粒滑石粉用量及反应温度等对反应速率的影响，并且测定了反应的表观活化能。

Template copolymerization of acrylamide with acylic acid was carried out in the presence of polyallylammonium chloride as matrix in aqueous solutions.The various influences on the rate of polymerization were studied by dilatometer and electrical conductivity measurements.

丙烯酰胺和丙烯酸模板共聚合是以聚烯丙基氯化铵模板存在下，在水溶液中进行，在这体系中，模板PAAC和单体AA有很强的相互作用，而单体AM与模板则没有作用。

Therefore, it s very important to control the content of dimethyallylamine and dimethylamine, strictly in the polymerization.

因此，在DMDAAC的合成中应严格控制二甲胺、叔胺含量；对于氯化钠、叔胺盐酸盐、二甲胺盐酸盐可以考虑控制在1000mg·kg~(-1)之内以降低精制成本。

In the study of by-product dioxane in polymerization reaction of EO,it is found that the effect of solvent is very small.And so do the catalyst BF_3-H_2O complex and catalyst H~+.

计算结果也解释了BF_3-H_2O催化环氧乙烷聚合产物分子量达到某一极限值后不再增加，消耗的单体都生成了二氧六环的原因。

Its steps include these:(1) purification of WPA;(2) neutralization reaction between purified WPA and sodium carbonate for the salt mixture of disodium hydrogen phosphate and monometallic sodium orthophosphate;(3) adjustment of the mixture's neutralizing degree with additive acid or alkali;(4) quick separation of crystal with additive organic solvent under continue stir;(5) polymerization of crystal under the high temperature for the high quality product of STPP.

其步骤为：(1)湿法磷酸净化；(2)净化后的磷酸与碳酸钠中和反应生成磷酸一氢钠和磷酸二氢钠混合盐溶液；(3)用酸、碱调节确定该混合盐溶液的中和度；(4)加入有机溶剂，通过不断地搅拌使晶体快速析出；(5)晶体经高温聚合，生成高品质的三聚磷酸钠。

For inverse suspension polymerization, water soluble monomer is dispersed in oil continuous phase and initiated in aqueous phase.

反相悬浮聚合是将水溶性单体分散在油溶性介质中，水溶性引发剂溶解于水相中进行聚合的方法。

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！