丙烯腈

The effect of residence time on the mechanism of chain termination of An freeradical polymerization was discussed.

探讨停留时间对丙烯腈聚合反应自由基链终止方式的影响。

PAN-ACF was modified by different methods, such as heat oxidation, nitric acid dipping and hydrogen peroxide dipping, the characteristics changes of the PAN-ACF before and after modification such as kinds of surface functional groups, amounts of oxygen function groups, surface microstructure and specific surface were analyzed by FT-IR, Boehm.

采用热氧化、硝酸浸渍、过氧化氢浸渍等方法对聚丙烯腈基活性炭纤维进行改性处理，使用FT-IR、Boehm滴定法、SEM、BET等分析技术表征了改性前后PAN-ACF表面官能团种类、含氧基团数量、表面微观结构及比表面积等表面特性。

Polyester would provide the best performance, but it is considered too costly for widespread use; acrylics are also considered too expensive despite the fact that they have superior properties for such uses.

涤纶纤维的性能最好，但人们认为它造价较高而不能大量使用；丙烯腈尽管具有许多优异的性能，但也被认为价格较高而不宜作此用途。

Polyester would provide the best performance, but it is considered too costly for widespread use; acrylics are also considered too expensive despite the fact that they have superior properties for such uses.

涤纶纤维的性能最好，但人们认为它造价较高而不能大量使用；丙烯腈尽管具有许多优异的性能，但也被认为价格较高而不宜作此途。

Produce per year nitrile of 50 thousand tons of propylene device and produce per year device of 30 thousand tons of acrylic fibbers to all be introduce technology and device.

年产五万吨丙烯腈装置和年产三万吨腈纶装置均为引进技术和设备。

Ministry of acrylic fibbers career is main raw material with propylene nitrile, fiber of manufacturing acrylic fibbers and acrylic fibbers wool.

腈纶事业部以丙烯腈为主要原料，生产腈纶纤维和腈纶毛条。

It is currently produced by catalytic ammoxidation of propylene in fluidised beds. Several disadvantages still remain in the process: high ammonia concentration in the raw gas; high CO2 yielding and considerable ammonia concentration in output gas. The key subjects in the research domain are effective catalyst design and environment-friendly process development.

工业上普遍采用流化床丙烯氨氧化法合成丙烯腈，但该工艺一直来存在原料气中氨的配比高、反应尾气中含有余氨和完全燃烧产物的收率仍较高的不足，开发高效低氨比催化剂及相应的环境友好反应工艺一直是该领域重点研究的课题。

High Isotactic polyacrylonitrile can be used to prepare high strength and high module carbon fiber.

高等规聚丙烯腈可作高强高模碳纤维的原丝，但对其预氧化过程的研究很少。

Everacid acid dyes tuffs and Everset neutral dyestuffs were used to dye milkcasein acrylonitrile copolymer fiberviz.

采用Everacid 酸性染料和Everset中性染料对牛奶酪素蛋白与丙烯腈接枝共聚纤维进行染色试验。

AN has shown remarkable embryotoxicity by subcutaneous injection.The threshold of teratogenic effect is lower than that by gavage,so AN is a weak teratogen.

结论丙烯腈皮下注射染毒有明显的胚胎毒性，致畸剂量小于经口染毒阈剂量，是一种弱致畸物。

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。