酐

Synthesis of tetraoctyl pyromellitate from pyromellitic dianhydride and isooctyl alcohol on solid super acid catalyst SO 2-_4/TiO_2-Al_2O_3 was studied.

以SO2-4/TiO2-Al2O3固体酸为催化剂、均苯四甲酸二酐和异辛醇为原料合成均苯四甲酸四异辛酯。

In this paper, the third monomer 1,4- benzenediamine was introduced into the system of pyromellitic dianhydride and 4, 4-diamino diphenyl. Polyamic acid was synthesized in N-methyl pyrrolidone by solution polycondensation. The chemical structure of the polymer obtained was characterized by infrared spectrum. The dynamic viscosity and intrinsic viscosity were measured. Studies were mainly focused on the influences of monomer solid contents, monomer adding methods on intrinsic viscosity.

本实验在常用的均苯四酸二酐和4，4'—二氨基二苯醚聚酰亚胺体系中，引入第三单体对苯二胺，采用三元共聚的办法合成出聚酰胺酸溶液，对合成产物进行了分子结构的红外光谱分析以及特性粘数、动力学粘度的测试，并讨论了单体固含量、加入方式等对聚酰胺酸特性粘数的影响。

Pyromellitic dianhydride and Sodium tetrazodiphenyl-naphthionate, 1,4-diaminoanthraquinone and Benzoguanamine as aromatic diamines were selected to be polymerized under microwave irradiation.

本论文选用均苯四酸二酐和刚果红、1，4—二氨基蒽醌、苯代三聚氰胺三种芳香族二胺作为单体，采用微波辐射的方法合成了具有非线性光学性能的聚酰胺酸和聚酰亚胺。

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。

In this paper, 4-4-(trifluoromethoxy benzoyl cyclohexyl-3, 5-diaminobenzoate with a large branch chain, pyromellitic dianhydride and 4-(4-aminobenzyl) benzenamine were used to synthesize polyimides. The effect of monomer charge order on pretilt angle was investigated for the first time when PIs were used as LC alignment layer, and the effect of diamine mole ratio on pretilt angle was studied. The thermal stability of the pretilt angle was discussed.

文章用均苯四酸二酐、4，4'-二胺基二苯甲烷和具有较大支链的4-（4-苯甲酰基）环己基－3，5-二胺基苯甲酸酯等单体制备聚酰亚胺，首次研究了单体加料顺序对液晶预倾角的影响，同时也研究了二胺配比对液晶预倾角的影响问题，并探讨了预倾角的热稳定性等问题。

The polycondensation of the benzoguanamine and pyromellitic Dianhydride was carried out under microwave irradiation, and the resulted polyamic acid was grafted with TDI-para position substitution aniline derivatives. Thus graft polymers with different electronic effect of the end group in side chain were obtained.

将微波辐射合成的苯代三聚氰胺-均苯四酸二酐体系的PAA与TDI-对位取代苯胺衍生物反应，通过改变TDI－对位取代苯胺衍生物的对位取代基来合成具有不同电子效应的侧链端基的接枝聚合物。

The influence of chain extender kind, content and reactive processing condition on molecular weight (averageM(subscript η) of recycled PET was studied carefully based on chain extenders of 2, 2'-Bis(2-oxazoline), Pyromellitic dianhydride and the mixture of the both during reactive extrusion processing.

分别使用双恶唑啉、均苯四酐及两者的混合物作为回收PET瓶的扩链剂，研究扩链剂的种类、扩链剂用量和反应挤出机加工工艺条件对PET产品相对分子质量

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。

That is, splitting up of the overall reaction in spatial or temporal into two steps,hydrocarbon selective oxidation and reoxidation of the reduced catalyst, and matching each step with suitable reaction condition.

模拟研究和在实验室微型反应器上的研究结果证实，在适宜的操作条件下，通过固定床反应器人为非定态操作能够改善反应的时均性能、提高顺酐的选择性和收率。

Creatininase could be induced by the reagents such as creatinine, creatine, sarcosine, choline chloride and urea. Mn(superscript 2+) Co(superscript 2+) could remarkably increased the productivity of creatininase.

诱导物肌酐、肌酸、肌氨酸、氯化胆碱和尿素可以诱导酶的产生，Mn(上标 2+)、Co(上标 2+)对酶的产生有促进作用。

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。