聚乙烯

Polywas directly halogenated to select halogenation agents such as Cl and Br and catalyst system.

通过将聚乙烯醇直接卤化取代，筛选出Cl、Br等卤化剂、催化剂，并优选出合适的体系，使其既保持PVA的高阻氧性，又能保证加工性时的热稳定

In this paper, the enzymatic hydrolysis lignin derivatives were synthesized. Halogenation of EHL was carried out in aqueous solution, and graft copolymerization of EHL was initiated by initiator. The chlorinated and graft copolymerized EHL were respectively applied to the chlorinated polyethylene rubber and styrene-butadiene rubber, and the properties of rubber were investigated.

本文采用水溶液法和引发剂引发法分别对酶解木质素进行了卤化和接枝共聚反应研究，合成酶解木质素的改性衍生物，将其分别应用于氯化聚乙烯橡胶和丁苯橡胶，并探讨橡胶各项性能的变化。

Suggested that wear of a polyethylene socket combined with a ceramic head might be as much as 20 times less than with a metal head.

Semlitsch等所做的早期体外磨损试验发现，聚乙烯臼配陶瓷头的磨损比配金属头小20倍。

The special lamination of polyethylene and aluminum foil which has good function on reflecting light and thermal makes the heat insulation not only has good functions on insulation, thermal reflection, heat protection, counter radiation but also has good functions on moisture proof and heat insulation and energy saving when used as building material roof, wall and floor etc.

通过镀铝膜材料反光、热的特性和聚乙烯材料的结合，使其不仅具有良好的绝缘、热反射、隔热、反辐射功能，而且还通过该材料的特性在房屋建筑应用上能起到很好防潮、保温、节能作用。

96H LC 0,96 h LC 50 ,and 96 h LC 100 of twelve chemicals of phenol ,alkyl benzene and nitrobenzene,and three water samples to sword fish(\%Xiphophorus helleri)\% and rare minnow(\%Gobiocypris rarus\%) were tested.3. The phenol ic waste water was purified through the absorption of polyvingl pyridine.

介绍了含酚废水与聚乙烯基吡啶类树脂接触，酚类会吸附在树脂上，使废水得到净化，然后将吸附了酚类的树脂加热处理回收酚，与此同时，对树脂也进行了再生处理，再生后的树脂可循环使

The method comprises:(1) weighing lead acetate hexahydrate and thioacetamide, and preparing aqueous solutions respectively, so that the concentration ratio of Pd2+ to S is 1:(1-4);(2) adding acetic acid into thioacetamide solution to adjust the pH value to 2-4;(3) adding poly surfactant into lead acetate solution, ultrasonicating to mix uniformly and obtain a colorless and transparent sol;(4) mixing the sol and thioacetamide solution;(5) placing the mixed solution in a sealed container, irradiating by 2.5 MeV and 40 mA electron accelerator with irradiation dose of 25-40 Mrad;(6) washing the product, centrifuging for separation, and drying to obtain black PdS nanoparticles.

本发明方法的工艺过程如下：首先称取一定量的六水合醋酸铅和硫代乙酰胺，各自配制成水溶液，其浓度比为使其中的铅离子浓度与硫原子浓度的比例为1∶1～1∶4；在硫代乙酰胺溶液中加入适量醋酸调节其pH值至2～4；醋酸铅溶液中加入少量表面活性剂聚乙烯醇，然后超声振荡，混合均匀，制成无色透明溶胶；随后将溶胶与上述的硫代乙酰胺溶液混合；将该混合液置于密闭容器中，并将其放置于2.5MeV、40mA的电子加速器产生的电子束辐照下进行辐照处理，其辐照剂量为25～40Mrad；然后将反应生成物清洗，并用高速离心机离心分离，然后干燥，最终得到黑色纳米硫化铅颗粒。

The effects of some factors on fermentation system during co-fermentation of hexose and pentose to fuel ethanol were studied.

正交试验获得的最佳发酵体系为：在基础发酵培养基中添加φ(Tween-80)=0.025%，ρ(聚乙烯醇4000)=100 g/L，ρ=

Superscript 3C NMR spectra for metallocene polyethylenes were measured to confirm the existence of various branches from methyl to hexyl end longer chains and other structural units. DRI from rheological data were used to determine the level of long chain branching in mPEs, and the results were compared with each other.

采用高分辨度(上标 13)C NMR谱直接测定茂金属聚乙烯的支化度及其他微量异种结构单元的组成，并过流变数据获得DRI指数来表徵mPEs长支链结构；对二者的结果进行了比较。

In this paper,polyvinylamine was prepared by Hofmann degradation of polyacrylamide, and its charge density and application as strength aids were studied.

采用聚丙烯酰胺的Hofmann降解反应制得聚乙烯胺，对其电荷密度进行初步分析，并研究了PVAm对纸页的增强作用。

The winding film, also called as elastic film, is a kind of soft polyethylene plastic film with good transparency, elasticity and intensity. In case of non-heating it, it can stretch in length and breadth. It can wrap the products of electrical household appliances, precision instrument, bicycle, motorcycle, top-grade furniture, etc with its own autohension and make them keep tension and unloosen for a long time.

缠绕膜生产设备生产的缠绕膜，是一种透明、富有弹性及强度的柔软聚乙烯塑料薄膜，它可在不加热的情况下，进行纵横双向冷拉伸，依靠它本身自粘性对家用电器、精密仪器、自行车、摩托车、高档家俱等包装，并可使货物长期保持张力而不致于松散。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。