乙炔基

According to the appraisal of ablate resistant resin,the properties and application of modified phenolic resin s and PAA etc new ablate resistant resin are Introduced.

根据对耐烧蚀树脂基体的评价，介绍了改性酚醛树脂及芳基乙炔等新型耐烧蚀树脂基体的性能及其应用概况，并指出高性能、低成本是今后耐烧蚀树脂基体的发展方向。

This paper expounds the oxyacetylene flare overlaying welding technology of tungsten carbide rod made to be metal matrix carbide ceramal compound overlaying welding layers.

介绍碳化钨条氧乙炔火焰堆焊制备金属基碳化物陶瓷复合耐磨堆焊层的工艺方法，结合碳化钨条氧乙炔火焰堆焊工艺过程、堆焊层性能特点、泥沙磨损实验结果及显微组织形貌，分析讨论了热源性质对堆焊层性能的影响以及复合耐磨堆焊层的抗泥沙磨损特性。

China mainly natural gas used in the production of nitrogen, followed by the production of methanol, formaldehyde, acetylene, methylene chloride, carbon tetrachloride, carbon disulfide, nitromethane, hydrocyanic acid and extraction of helium and carbon black. Since the 70s, has built more than natural gas and oil field associated gas as raw materials for large-scale ammonia plant, as well as a number of small and medium-sized ammonia plant, so that the national structure of the synthetic ammonia production of raw materials, natural gas share of about 30%; also be built at the same time A system of acetylene gas plant to manufacture Vinylon and vinyl acetate, acetylene gas used in the production of methanol.

中国天然气主要用于生产氮肥，其次是生产甲醇、甲醛、乙炔、二氯甲烷、四氯化碳、二硫化碳、硝基甲烷、氢氰酸和炭黑以及提取氦气。70年代以来，已兴建多座天然气和油田伴生气为原料的大型合成氨厂，以及一批中、小型合成氨厂，使全国合成氨生产原料结构中，天然气所占的比例约达到30％；同时还兴建了天然气制乙炔工厂，以制造维尼纶和醋酸乙烯酯，乙炔尾气用于生产甲醇。

The invention pertains to the technical field of medial intermediate compound synthesis, in particular to method to prepare 4-acetylenyl phenylformic acid.

本发明属于药物中间体合成技术领域，具体涉及一种4-乙炔基苯甲酸的制备方法。

Polybenzimidazolewas modified by means of blending with a novel heat-resistant resin methyl-di-phenylacetylene-silane,by which the meltability of PBI was impoved,and the time of the melting stage of PBI was prolonged,resulted in improvement of the processability of PBI,meanwhile the heat resistance of PBI did not decline,and the water absorption of PBI was lowered.

以一种新型耐高温树脂聚甲基二苯乙炔基硅烷通过共混改性聚苯并咪唑树脂，提高了PBI树脂的熔融性并延长了树脂熔融状态的时间，改善了PBI树脂的加工性能。同时PBI优良的耐热性保持不变，并降低了树脂吸水率。

Six lateral difluorine substituted tolan -type liquid crystals were synthesized via Sonogashira cross-coupling of 4-alkylphenylacetylene and 4-iodo-2,3-difluoro-1-alkoxybenzene under the protection of argon.

用邻二氟苯为起始原料，在-78℃经过两次选择性"邻位金属化"反应、醚化反应、氧化反应制得2，3-二氟-4-碘-1-烷氧基苯，再与4-烷基苯乙炔在氩气保护下进行Sonogash ira偶联反应，制备出6种侧向二氟取代二苯乙炔类液晶。

In order to lower the Δn value and obtain broad mesophase range, new negative dielectrics anisotropy liquid crystal compounds 4a and 4b were designed by replacement a phenyl ring with a cyclohexyl ring in the common tolane liquid crystals.

为降低液晶分子的双折射率并获得宽液晶相区，用环己基替代传统二苯乙炔液晶分子中的一个苯环，得到一类结构新颖的含乙炔桥键的负介电各向异性液晶分子4a， 4b。

Four soluble poly(p-phenylene vinylene) derivatives with asymmetric alkoxyl substituents, poly (2-methoxy-5-butoxy)-p-phenylene vinylene, poly [2-methoxy-5-(3'-methyl)butoxy]-p-phenylene vinylene, poly (2-methoxy-5-hexyloxy)-p-phenylene vinylene and poly (2-methoxy-5-octoxy)-p-phenylene vinylene, were prepared by dehydrochlorination reaction with using p-hydroxyanisole and alkyl bromide as raw materials.

以对羟基苯甲醚和溴代烷烃为原料，采用强碱诱导的脱氯化氢缩合聚合法合成了四种可溶性不对称烷氧基取代聚对苯乙炔衍生物，分别为聚（2-甲氧基－5-丁氧基）对苯乙炔、聚［2-甲氧基－5-（3'-甲基）丁氧基］对苯乙炔、聚（2-甲氧基－5-己氧基）对苯乙炔和聚（2-甲氧基－5-辛氧基）对苯乙炔。

In the second chapter, a rational synthetic route for enantiopure 2,2'-diethynyl-1,1 '-binaphthyl was established.

在论文的第二章，主要讨论了具有单一手性(R构型或构型的2，2'-二乙炔基-1，1'-联萘模板的合成。

From the optically active 2, 2'-dihydroxy-1,1 '-binaphthyl, through esterification, Kumada coupling, bromization, hydrolization and Wittig elimination reaction, 2,2'-diethynyl-1,1'-binaphthyl was obtained.

从光学活性的2，2'-二羟基-1，1'-联萘出发，经过酯化，Kumada偶联，溴化，水解和Wittig消除反应五个步骤，成功地获得了具有单一手性的的2，2'-二乙炔基-1，1'-联萘。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。