查询词典 polystyrene

Measurement of refractive index of polystyrene beads by using Mie scattering theory［J］.

用Mie氏散射理论测量聚苯乙烯微球的折射率［J］。

And also polystyrene-supported benzyl selenide can be regenerated and reused.

另外，聚合物试剂还可以通过简单处理回收利用。

On the rare occasions that I have flown with a bottle in a suitcase, I pack it in a polystyrene tube and swathe the whole thing with Sellotape.

在为数不多的几次带酒飞行过程中，我把酒装在聚苯乙烯管内，并且用透明胶带整个粘起来。

We started him on sodium polystyrene sulfonate.

开始给他用聚苯乙烯磺酸钠治疗肾病

The factors which affacted the sulfonation of superfine polystyrene via concentrated sulfuric acid route were considered and discussed.

研究了浓H2SO4对SfPS粒子的磺化工艺，探讨了影响SfPS磺化的主要因素。

The copolymers are oxidized with hydrogen peroxide in the presence of osmium tetroxide. It is confirmed by superscript 1H-NMR and FTIR that the double bonds in the molecule chains of the copolymers are fully oxidized, while the segments of polystyrene in the copolymers are kept intact.

采用双氧水在四氧化锇催化下对聚合物分子链进行氧化降解，1H-NMR和FT-IR分析表明共聚物中的双键被全部氧化并发生断裂，而共聚物中聚苯乙烯的链节并未被破坏。

Experimental results indicate that for the polystyrene particle with a larger size, Umf changes with p-0.3, and for the sand particle with a smaller size, Umf changes with p-0.21. An empirical equation about Umf is proposed based on the experimental data: Umf=μdp ρg｛［(34.15)2+0.05916×dp3 ρggμ2］12-34.15｝ It is found that the bed expansion height increases with the increasing of gas velocity, and increases with pressure for fixed value of UUmf, when the pressure exceeds 0.7MPa, the influence of pressure on the bed expansion height is weakened.

研究结果表明，大粒径聚苯乙烯颗粒的Umf与p-0.3成比例，小粒径石英砂的Umf与p-0.21成比例，并根据实验值拟合出压力下最小流化速度公式为： Umf=μdp ρg｛［(34.15)2+0.05916×dp3 ρggμ2］12-34.15｝床层膨胀高度随气速的增大而不断增高，在相同UUmf下床层膨胀高度随压力的增大而增高，在大于0.7MPa时，压力对膨胀高度的影响减弱。

Second, aminolysis of polystyrene and poly prepared by reversible addition-fragmentation chain transfer polymerization was investigated. The product of the former contains predominantly double molecular weight species by the formation of disulfide bond, whereas the latter formed coupled species which consequently cleaved to unimolecular weight species.

由RAFT聚合的机理可知，聚合最终得到的聚合物的结构包含双硫酯基团，它是聚合物链保持活性特征的重要体现，同时它为聚合物的端基官能化提供了一个重要的途径，其中氨解反应是一个被人们广泛采用的方法，它在很温和的条件下将端基去掉，同时还能将双硫酯端基变成硫醇端基。

It is shown that polystyrene has been grafted on the surface of nmSiO2 particles and the grafting ratio is about 40%. The surface of nmSiO2 could be treated effectively by KH570in absolute ethanol at 25℃, 48h. The nmSiO2-g-PSt unpurified by toluene appear microsphere in which nmSiO2 particles are contained, whereas the purified one appear internet formed by many pieces. The grafting ratio of PSt on nmSiO2 surface could be influenced obviously by dispersion agents content and agitation speed, whereas the morphology of nmSiO2-g-PSt purified is rarely changed.

结果表明：常温下在无水乙醇介质中处理48h以上可获得良好的硅烷处理效果；PSt已接枝包覆于nmSiO2表面，接枝率约40%；经甲苯洗涤前nmSiO2-g-PSt呈多粒子包覆微球状，洗涤后呈单粒子包覆网状结构；分散剂用量、搅拌速度改变对接枝率有影响，但对包覆形态影响不大。

The molecular weight and molecular weight distribution of polystyrene of A B Cmade in differ ent conditions are determined with gel permeation chromatography and viscometry method .

本文采用凝胶渗透色谱法和粘度法分别测定了甲，乙，丙三种聚苯乙烯产品的分子量及其分布，为改进产品性能提供了依据。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。