Towards General Guidelines for Aligned,Nanoscale Assemblies of Hairy‐Rod Polyfluorene

This account highlights recent progress towards understanding the complex hierarchical levels of solid‐state structure in a prototypical helical hairy‐rod polyfluorene, poly[9,9‐bis(2‐ethylhexyl)fluorene‐2,7‐diyl] (or PF2/6). This branched‐side‐chain containing polyfluorene undergoes a systematic intermolecular self‐assembly and liquid‐crystalline phase behavior in combination with uniaxial and biaxial alignment. The latter processes yield full three‐dimensional orientation of the crystallites and polymer chains. Also reviewed are the impact of the molecular structure and phase behavior on surface morphology, anisotropic film formation, and, ultimately, the overall impact of these physical attributes on optical constants. This particular polyfluorene also represents a model system for demonstrating the applicability of mean‐field theory in detailing the self‐organization of aligned hairy‐rod block‐copolymer systems. These results of PF2/6 are compared to those of other archetypical π‐conjugated hairy‐rod polymers. General guidelines of how molecular weight influences nanostructure, phase behavior, alignment, and surface morphology are given.     

大庆油田三类油层聚合物驱注入速度研究

注入速度是影响聚合物驱开发效果的重要指标,而由于假设条件的局限性,数值模拟方法无法体现聚合物溶液弹性对注入速度的影响。为了确定大庆油田三类油层合理注入速度,通过不同注入速度条件下的天然岩心驱油试验,对水驱和聚合物驱驱油效率进行了研究,结果表明,聚合物驱驱油效率提高值随驱替速度的变化可由二次多项式来表示。依据此关系式,由势的叠加理论得到的流体在油层中的渗流速度的基础上,建立了该类油层合理注入速度模型,并给出大庆油田三类油层在100 m注采井距下的合理注入速度为0.288 PV年/,该方法对现场开发方案编制有重要指导意义。     

高吸水性树脂吸水率测定条件的研究

通过自然过滤法在不同条件下测定了淀粉接枝丙烯酸高吸水性树脂的吸水率，实验给出了该方法测定吸水率的最佳条件，即：滤袋网孔尺寸为0.180～0．280mm，树脂质量约0．3g，加水量约500mL，吸水时间≥2h，沥水时间≥50min。     

二甲基二烯丙基氯化铵(DMDAAC)及其聚合物研究新进展

二甲基二烯丙基氯化胺 ( DMDAAC)是一种水溶性阳离子单体 ,其均聚物和共聚物 ,高效价廉 ,可广泛应用于油田、造纸、水处理、医药等领域 ,引起了化学工作者的普遍关注。综述了近五年来DMDAAC单体的合成、聚合方法以及均聚物和共聚物研究应用新进展 ,并对今后的研究重点提出一些建议     

Improvement of emission efficiency in polymer light-emitting devices based on phosphorescent polymers

We report improvement of emission efficiency in polymer light-emitting devices (PLEDs) employing phosphorescent polymers. A hole-blocking layer was inserted between the emissive layer and the cathode to enhance recombination efficiency for the injected holes and electrons. Aluminum(III)bis(2-methyl-8-quinolinato)4-phenylphenolato (BAlq) was used for the hole-blocking layer. The resultant PLEDs exhibited significant improvement of emission efficiency. The respective external quantum efficiencies for red, green and blue PLEDs were 6.6, 11 and 6.9%. These values are very high compared with those based on conventional fluorescent polymers.     

XPS studies of directly fluorinated HDPE: problems and solutions

X-ray photoelectron spectroscopy (XPS) applied to the study of fluorinated polymer surfaces presents several problems related both to peak assignment and to degradation. In this work, we analyse extensively the question of XPS peak assignments in this kind of surfaces. We conclude that in this kind of surfaces using binding energy differences between fluorine and carbon is better than using absolute binding energies. Also a useful relation between fluorine photoelectron energy vs. polymer composition expressed through the atomic ratio fluorine/carbon (F/C) was found. A protocol for data treatment is proposed and applied to a XPS study of the degradation induced by X-ray on high-density polyethylene surfaces modified by direct fluorination. Results obtained for the degradation, namely the atomic ratio F/C obtained by two different methods, combined with angle resolved X-ray photoelectron spectroscopy (ARXPS) were used to study the fluorine concentration profile in depth, producing self-consistent results.     

Adhesion mechanisms of enamel–varnishes on copper: Adhesion promoter versus corrosion inhibitor

The role of adhesion promoters, copper oxidation, and thermal aging in the adhesion mechanism of enamel on copper winding wires is investigated. Evidence is presented on the predominant role of the copper oxide at the interface in the wire–enamel adhesion phenomena. The oxidation process and the copper oxides stability at the interface are seen to strongly depend upon the thermal aging of the wire and the nature of both the enamel and the promoter. Atomic force and scanning electron microscopy analyses show that so‐called promoters act more efficiently as corrosion inhibitors than as adhesion enhancers. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 952–958, 2003     

P／MCs新型复合材料制备、结构及阻尼性能

采用特殊的渗流法所制备的新型Ｐ／ＭＣｓ复合材料，由高分子聚合物与蜂窝状铝架组成，它具有优异的阻尼性能，并简述了结构对阻尼的影响     

高聚物共混物及嵌段共聚物熔体的流变性（Ⅰ）共混物熔体的流动特性

综述了高聚物二元共混物及嵌段共聚物熔体的静态流变性，分析了不同共混体系的流动曲线，总结了共混物的流动特性及规律     

非反应性共聚物增容剂的作用

简述了共聚物增容剂在聚合物熔融共混物中的作用方面的研究进展。阐述了A-B、A-C和D-E型非反应性共聚物增容剂。重点介绍了增容剂的分子量、用量对聚合物共混物的界面张力、相畴尺寸和聚结的影响。