聚丙烯

The dynamic and equilibrium surface tensions and conductivity of the dilute solutions of cationic polyacrylamide and SDS were measured with pendant drop tensiometer and conductometer, respectively.

通过测量阳离子型聚丙烯酰胺/十二烷基硫酸钠体系的动态表面张力、平衡表面张力及电导率，研究了聚丙烯酰胺的阳离子度的作用。

With the ceaselessly improvement of catalyst properties, the production process of catalyst became more and more intricacy that requires even more strict process controlment on production process and even higher quality management on process.

聚丙烯高效催化剂是丙烯聚合工业的技术核心，催化剂产品质量直接影响着聚丙烯产品的质量及新产品的开发。

As polypropylene fiber has virtues of good mechanics properties and enduring chemic corrasion , which can be used improve resisted tensile stress and toughness .

聚丙烯纤维是一种弹性模量低于水泥基基体的有机合成纤维，由于聚丙烯纤维具有很好的力学性能，耐化学侵蚀的优点，它可望用于改善基体的抗拉性能与韧性性能。

The dichromatic space groups of C2/c have been derived.

推导了与C2/c空间群有关的有色空间群，研究了聚丙烯分子链在它们中的排布，得出其中5种是聚丙烯α晶晶体结构可能存在的空间群；2。

PP woven bag production line, plastic woven sack machine equipment, This machine is used to weave endless tubular or flat heavy or light fabric of pp or hdpe for jumbo bags, container bags, geotextiles, tarpaulins, etc. We make various kinds of paper bag production line, plastic woven bag machine and equipment, cement bag machine and equipment, fertilizer bag machine and equipment, feedbag machine and equipment, rice bag and flour bag machine and equipment, sugar bag machine and equipment, fibc, container bag, big bag, jumbo bag machine, tarpaulin equipment, shopping bag, t-shirt bag, film cover machine and equipment, mesh / net leno bag machine and equipment for fruit and vegetable our machinery are well sold in more than 20 countries worldwide.

聚丙烯编织袋生产线，塑料编织袋机器设备，这台机器是用来编织无休止的管状或持平重型或轻型织物聚丙烯或高密度聚乙烯的巨型包，容器袋，土工布，防水油布等我们做出各种纸袋生产线，塑料编织袋机器和设备，水泥制袋机和设备，化肥袋机器和设备， feedbag机器和设备，大米和面粉袋制袋机和设备，糖袋机械和设备，集装袋，集装箱袋，大袋，大型制袋机，油布设备，购物袋， T恤袋，地膜覆盖机和设备，网格/净杰伊莱诺制袋机和设备，用于水果和蔬菜的机械已远销20多个国家的世界各地。

Due to its linear chain structure, polyacrylamide, combined with DDA, tends to form the high molecular collector with more surface activities. In addition, with the high molecular weight, polyacrylamides (with the exception of hydroxamic acid polyacrylamide) can strongly flocculate kaolinite, which can increase the adsorptive density of collector and activate the kaolinite flotation.

由于分子的直链结构，聚丙烯酰胺药剂易与捕收剂十二胺形成表面活性更高的高分子捕收剂，同时由于聚丙烯酰胺具有较高的分子量，对高岭石显示很好的絮凝作用，增加了捕收剂的吸附密度，活化了高岭石的浮选。

The results show that the compound conductive fiber has typical structure of sheath-core consists of black greened polyaniline electric conductive deposition as the skin and the white polypropylene matrix fiber as the core, which makes the compound fiber preferable physical mechanical property. The intensity and the elongation ratio of the electric conductive fiber are decreased but the thermal stability is enhanced after modified. The compound fiber has the good acid resistance but poor base resistance. The thermal stability of the compound fiber prepared by 4-methyl-benzene sulfonic acid is better than that prepared by hydrochloride acid. Moreover, the compound fiber can be re-doped by other organic or inorganic acid after freed from the adsorbed acid. Furthermore, the electric conductivity of the compound fiber decreases with the temperature increasing but hardly changed with the humidity. The adsorptive ability and therefore the content of the polyaniline, the constant of electric conduction, and the durability of the compound fiber can be enhanced by thinning the diameter, section heteromorphosis, section heteromorphosis and plasma treatment of the surface or blending with COPET of the fiber.

结果表明：复合纤维是聚丙烯与聚苯胺的共混体系，具有典型的皮芯型结构，皮层为墨绿色的聚苯胺沉积层，形成连续的导电通道，芯层为白色的聚丙烯基质纤维，提供物理机械性能；导电改性后纤维的强度、强力和伸长率均有下降，但热稳定性得到提高；复合纤维的耐酸性比耐碱性好，以对甲苯磺酸做掺杂酸比盐酸掺杂聚苯胺热稳定性好，脱掺杂后的复合纤维，可用其它无机酸或有机酸进行再掺杂；复合导电纤维的电导率随温度升高降低幅度较大，但几乎不受湿度影响；基质纤维细旦化、截面异形化、表面等离子体处理或共混COPET等改性处理均能提高纤维的吸附性，进而提高复合纤维表面聚苯胺含量、电导率和耐久性。

The market situation and the basic characteristics of polypropylene hot-water pipe was discussed in this paper.

本文论述了聚丙烯热水管的市场状况及基本性能，并介绍了聚丙烯热水管的开发情况。

The results of thermal property of DSC for PP composites show that two melting temperatures implied immiscibility for PP composites. The melting temperature and corresponding fusion heat for PP material was not changed by additives. Therefore, the immiscibility PP composites resulted in their poor mechanical properties.

聚丙烯复合材料出现双峰现象，此处显示各组有不相容之材料，因材料的不相容，将导致机械性质的降低，图中可知添加的材料对聚丙烯之融熔热与熔点皆无显著改变。

This paper introduces the influence of the polyropylene fiber on plastic shrinkage and anti-permeability of concrete,and the analysis of anti-cracking and impermeability mechanism.

介绍了聚丙烯纤维对混凝土塑性收缩及抗渗性能的影响，并进行机理分析，最后展望了聚丙烯纤维混凝土在渠道防渗工程中的应用前景。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。