酐化

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。

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。

Based on 26B4APBN monomer, polyamic acid was obtained by polymerization with pyromellitic dianhydride, and further imidized into polyimide film by heating process.

由二胺单体和均苯四甲酸二酐进行聚合得到26B4APBN/PMDA聚酰胺酸，再经热亚胺化得到聚酰亚胺薄膜；测试了该薄膜的接触角，讨论了单体分子结构对聚合物接触角的影响。

On the basis of above works, dibutyl sebacate and 1、2-cyclohexanedicarboxylic acid diisobutyl ester were chosen to be absorbents of MA according to the solubility and property of solvents.

第二：在前一部分工作基础上，考虑了溶解度测定结果和溶剂本身性质选择有机溶剂癸二酸二丁酯和溶剂六氢化邻苯二甲酸二异丁酯作为吸收顺酐的吸收剂。

The stereochemical effect of the chiral amino acid residues on the formation of penta-coordinate phosphorus intermolecular mixed carboxylic-phosphoric anhydride from N-phosphorylamino acids was studied with density functional theory calculations at B3LYP/6-311G level.

用密度泛函方法在B3LYP/6-311G水平上对N-磷酰化氨基酸生成五配位磷酸羧酸混酐反应中手性氨基酸残基侧链的立体化学效应进行了研究。

Disclosed is a polyimide resin having a glass transition temperature of 200-320 DEG C and containing a siloxane diamine residue, a fluorene diamine residue and a specific tetracarboxylic acid dianhydride residue at certain ratios.

本发明提供玻璃化转变温度为200～320℃，以特定比例含有硅氧烷系二胺残基、芴系二胺残基和特定四羧酸二酐残基的聚酰亚胺树脂。

Ferrocene will be acetylated by the action of phosphoric acid* and acetic anhydride*.

二茂铁可以与磷酸*和乙酐*作用而被乙醯化。在反应混合物中，产物的数量可以通

Ferrocene will be acetylated by the action of phosphoric acid* and acetic anhydride*.

二茂铁可以与磷酸*和乙酐*作用而被乙醯化。在反应混合物中，产物的可以通

IV . Content and Capacity: 2,400,000t/a stamping coke, 30,0000 t/a coal tar, 10,0000 t/a methanol, 10,0000 t/a phenol anhydride, 5,0000 t/a Needle coke, 10,0000 t/a Hydrogenation of anthracene oil, 10,0000 t/a Hydrogenation of Crude benzene, 2,0000t/a β-naphthol, 1,0000t/a 2-hydroxy-3-naphthaoic acid , 2,0000t/a UHP ultra-high power electrode.

四、项目建设内容及规模：240万吨/年捣固焦炉及化产回收、30万吨/年焦油、10万吨/年甲醇、10万吨/年苯酐、5万吨/年针状焦、10万吨/年蒽油加氢、10万吨/年粗笨加氢、2万吨/年二萘酚、1万吨/年2.3酸、2万吨/年 UHP 超高功率电极。

Thermal imidization of the polyamic acid derived from BPADA and BAPS was investigated mainly by GPC and FTIR equipped with an in-situ hot cell.

利用GPC、原位FTIR测定了长链聚酰胺酸PAA由双酚A二酐与 4 ，4′-二(4-胺基苯氧基二苯酚制备的热环化过程。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。