低聚反应

The invention relates to a method for making oligomeric isocyanates by reacting diisocyanates in the presence of a catalyst, wherein the catalyst comprises a saline compound prepared from an anion selected from 1,2,3- or 1,2,4-triazole, a substituted species of 1,2,3- or 1,2,4-triazole and carbocyclically and/or heterocyclically annellated species of 1,2,3- or 1,2,4-triazole and the cation selected from an alkali metal, alkaline-earth metal and/or monovalent ammonium cation and/or phosphonium cation of formula (5), wherein the E, R1, R2, R3, R4 are as defined in the descriotion.

本发明涉及一种制备低聚异氰酸酯的方法，包括二异氰酸酯在催化剂的存在下进行反应，其中所述催化剂由盐化合物组成，该盐化合物由选自1，2，3-或1，2，4-三唑、1，2，3-或1，2，4-三唑的取代系列者、1，2，4-三唑的碳环稠合系列者、1，2，3-或1，2，4-三唑的杂环稠合系列者的化合物及其混合物的阴离子和选自碱金属、碱土金属和/或通式(5)的一价铵阳离子和/或磷友衾胱拥难衾胱又票福其中E、R 1 、R 2 、R 3 和R 4 如说明书中所定义。

The low molacular hydrogenated bisphenol A epoxy resin was prepared by the ring-closing reaction of the chlorohydrin ether and alkali and high molecular hydrogenated bisphenol A epoxy resin was synthesis by the addition polymeration of the low one and hygenated bisphenol A.

氢化双酚A和环氧氯丙烷在催化剂作用下开环反应生成了氯醇醚，而后加碱进行闭环反应，制备了低分子质量氢化双酚A型环氧树脂，再将其进一步与氢化双酚A等进行加聚反应，得到高分子质量环氧树脂。

Ce NH〓 at 150℃, which can't separate the temperature of imide reaction from that of crosslinking reaction.

Ce。NH〓在150℃就可以催化CNPA发生交联反应，不能将低聚物的亚胺化温度和交联温度分开。

It was detected by DSC that the temperature of imide and crosslinking reaction are differentiated by the catalysis of acetyl acetone copper and rare earth.

DSC研究表明乙酰丙酮铜催化剂和稀土催化剂可以分开低聚物的亚胺化和交联反应温度。

Samples of five sets of different mole ratios of the catalyst and caprolactam were sealed inseparate tubes and heated at 230±1° in a specially designed tube furnace.

测定其各组试样在各反应时间后所得聚合产物中的单体含量，低聚体含量和聚合体生成量，以及聚合体的数均分子量。

A novel kind of oligomer PPV derivative containing oxadiazole in the main chain was synthesized according Heck reaction, efficiency of single layer OPPV device was about five time higher comparing with single layer PPV device, which was attributed to the improved, balance of carrier injection and transportation.

三、利用Heck反应合成了PPV主链上含有恶二唑基团的可溶性低聚物OPPV，OPPV的单层器件的效率较单层PPV器件的效率提高5-10倍，证明了单层器件亮度和效率的提高是载流子平衡注入和传输的结果。

Then peracetic acid was employed as oxidant to prepare POSS-epoxide and the epoxy value can be controlled by reaction temperature.

而后，又以过氧乙酸为氧化剂，制备了带有环氧基团的多面体低聚硅倍半氧烷分子，并可通过反应温度控制其环氧值。

It is shown that the cyanate resin has low cure reactivity and high flowability, so the resin flow can not be controlled easily. The precure process makes the resin cure to a certain extent, decreases resin flowability, improves resin processability significantly, and enhances the composite laminates quality.

研究结果表明，该氰酸酯树脂反应活性低且流动性高，热压工艺中树脂流动不易控制；预固化可使氰酸酯树脂发生一定程度的自聚反应，从而降低其流动性，可明显改善氰酸酯树脂的工艺性，提高了层板的成型质量。

A New type of benzoxzine precursors was systhesized based on methoxy methylene diphenyl ether oligomer.The struture of product was characterized by IR and H-NMR analysis and effects of solvent polarity,temperature on the precursor composition were investigated.

以甲氧基次甲基二苯醚低聚物为基础合成了苯并口恶嗪预聚物，用H－NMR、IR表征了该预聚物的结构，讨论了反应温度、溶剂的极性等因素对合成预聚物的结构和组成的影响。

The optimum conditions of enzymatic hydrolytes of xylan were obtained.

同时为提高资源再生程度及产品纯度，研究了超滤技术与木聚糖酶解反应耦合效应，研究中获得不同的操作条件、加料方式对低聚木糖与总糖比有密切关系，因而采用浓酶液酶解木聚糖时，使木糖得率大大降低，低聚木糖与总糖比提高为0.99。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。