二二二

The effects of imidization method,coagulation bath and temperature were studied on the structure and separation performance of polyimide membrane,prepared by using pyromellitic dianhidride and 4,4′-oxydianiline as raw materials.

针对以均苯四甲酸二酐和4， 4′-二氨基二苯醚为原料合成聚酰亚胺的过程，研究了亚胺化方法、凝胶浴组成与温度等条件对膜的结构和分离性能的影响。

In this paper, the synthesis of polyamide acid resin, with 4, 4′-diam-inodiphenyl ether and pyromellitic dianhyride as monomers and dimethylacetamide as solvent, is reported; the preparation of polyimide fiber from PAA resin by dry- spinning method is described; and the effects of various factors of operating conditions upon the mechanical properties of the fiber is discussed.

本文报导了用4，4′—二氨基二苯醚与苯均四酸酐作单体，在N，N′—二甲基乙酰胺溶剂中合成聚酰胺酸树脂，以及用该树脂经干纺法制备纤维和制备过程中各项参数对纤维力学性能的影响。

Ultra-thin freestanding polyimide films of 100 nm thickness were formed by sequential evaporation of 4,4'-diaminodiphenyl ether and pyromellitic dianhydride precursor monomers followed by a thermal treatment of 150 ℃ 1 h and 350 ℃ 2 h.

采用分层蒸镀法，在玻璃基片上依次蒸镀二氨基二苯醚和均苯四甲酸二酐两种单体，然后在空气环境中对样品进行不同温度和时间的热亚胺化处理，使二者在交界面上反应生成聚酰亚胺。

A high temperature resistant polyimide adhesive agent was synthesized by pyromellitic dianhydride and 4,4-diamino diphenyl ether in order for the self-adhesion of aero dynamo magnetic steel plates.

为解决国内无法生产航空电机用自粘磁钢片的难题，用均苯四甲酸二酐和二氨基二苯醚合成一种耐高温聚酰亚胺粘合剂，配合相应的处理工艺，制成一种耐250℃的自粘性磁钢片，成功应用于航空、航天等高科技领域。

Polyimide/silica (PI/SiO2) nano-hybrid films of different solid content were prepared based on pyromellitic dianhydride and 4, 4'-oxydianiline using tetraethoxysilane as the inorganic precursors.

以均苯四甲酸二酐和4，4'-二氨基二苯醚为有机单体，正硅酸乙酯为无机前驱体，制备了SiO2含量一定，PAA杂化胶液固体含量不同的PI/SiO2纳米杂化薄膜。

The results showed:the fatty acid composi- tion of crude fish oil and refined fish oil of Rachycentron canadum Linnaeus muscle have not the obvious change,mainly the 18 kinds of fatty acids of C_(14)～C_(22);the content of unsaturated fatty acid was 44.31% and 48.53% respectively;the total content of eicosapentaenoic acid and doconsahexaenoic acid...

结果表明：军曹鱼鱼肉粗鱼油和精制鱼油脂肪酸组成没有明显变化，主要由C14～C22的18种脂肪酸组成，不饱和脂肪酸含量分别为44.31%、48.53%；二十碳五稀酸和二十二碳六稀酸总量分别为13.67%、14.88%；酶解蛋白粉粗蛋白含量为95.77%，脂肪含量0.32%，灰分5.45%，具有高蛋白、低脂肪、矿物元素丰富的特点；必需氨基酸占氨基酸总量的41.58%，必需氨基酸之间比例适宜，符合FAO/WHO推荐的理想蛋白质模式。

Dioctyl sebacate was prepared by esterification of 2 ethylhexyl alcohol and sebacic acid in catalysis of aluminate.

以癸二酸与2－乙基己醇为原料，铝酸盐为催化剂，合成了癸二酸二辛酯。

Dihexyl sebacate was synthesized from sebacic acid and n-hexanol with silicotungstic acid as catalyst.

以硅钨杂多酸为催化剂，癸二酸和正己醇为原料合成了癸二酸二己酯。

Transesterification between dimethyl sebacate and 1,2,2,6,6-pentamethyl-4-piperidinol was studied with tetraisopropyl orthotitanate ,lithium amide and di-n-octyltin oxide used separately as catalysts.

对癸二酸二甲酯与1，2，2，6，6-五甲基哌啶醇的酯交换反应进行了研究；分别考察了四异丙基钛酸酯、氨基锂、氧化二辛基锡3种催化剂的性能；采用氢核磁共振确定了产物的结构；考察了以四异丙基钛酸酯为催化剂时反应温度、反应时间、原料配比和催化剂用量对反应的影响。

Compostie effects between zinc dialkyldithiophosphate and succinimide in liquid paraffin were investigated, and the protecting films formed on iron surface by either of the two additives alone or their combination were studied with the aid of in situ dynamic temperature variation infrared spectroscopic technique.

研究了二烷基二硫代磷酸锌与丁二酰亚胺在液体石蜡中的复合效应，并对这2种添加剂单独使用或组合使用时在铁表面形成的保护膜进行了原位动态变温红外光谱分析，同时还与其它添加剂组合体系作了对比试验研究，探讨了二者产生复合效应的机理。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。