聚吡咯电流变体的导电特性

以聚吡咯为悬浮颗粒相、硅油为分散介质，制备了聚吡咯电流变悬浮液，研究了其导电特性及影响因素结果表明，随着电场强度、颗粒电导率、颗粒浓度、温度的增高，悬浮体系的导电性增大；而随着剪切速率的提高，体系的导电特性降低     

聚吡咯电流变化的导电特性

以聚吡咯为悬浮颗粒相、硅油为分散介质、制备了聚吡咯电流变悬浮液，研究了其导电特性及影响因素。结果表明，随着电场强度、颗粒电导率、颗粒浓度、温度的增高，悬浮体系的导电性增大；而随着剪切速度的提高，体系的导电特性降低。     

甲壳质悬浮液的电流变效应的研究

以甲壳质为悬浮颗粒，以硅油为分散介质、丙三醇为活化剂，制得悬浮液。并研究了该悬浮液的电流变效应及其影响因素，如电场强度、剪切速率、活化剂用量等。同时探讨了悬浮体系的漏电流密度及其影响因素。实验结果表明，活化剂的最佳用量约为５％（质量）；随着电场强度、颗粒浓度的提高，体系的电流变效应增大；而随剪切速率的增大，体系的电流变效应减弱。体系的漏电流密度随电场强度及颗粒浓度的增大而增大，随剪切速率的增大而减     

聚苯胺悬浮液的电流变效应

以掺杂态的聚苯胺为悬浮颗粒，以硅油为分散介质，制得悬浮液，研究了它的电流变效应及其影响因素，如电场强度，剪切速率，悬浮液浓度，颗粒介电常数等。还研究了该体系的漏电流密度及其影响因素。实验表明，随着电场强度等的增大，悬浮液的电流变效应增大，同时漏电流密度也增大；而随剪切速率的提高，电流变效应及漏电流密度均减弱。     

聚吡咯在蓖麻油中的电流变效应

研究了聚吡咯在蓖麻油中的电流变效应.结果表明:在电场作用下该体系表现出良好的电流变效应.随着电场强度、聚吡咯浓度的增加,电流变液的漏电流增大,而随着剪切速率的减小,体系的漏电流却增大.非离子表面活性剂的加入会使聚吡咯电流变液的电流变效应变差.     

影响柔性版印刷水基油墨粘度的因素分析

在分析柔性版印刷水墨在传输转移过程中的流变特性的基础上,研究了剪切应力、剪切速率、屈服值、油墨颜料粒子、表面活性剂以及温度等对柔性版水基油墨粘度的影响.结果表明,剪切应力、剪切速率和屈服值对水基油墨的粘度有直接影响,总体上可以用Carreau 模型来描述.表面活性剂等助剂的加入通过对颜料体积浓度和油墨屈服值的影响,间接影响油墨粘度.     

氧化塘污泥流变特性的研究

本文选用聚铁作为絮凝剂,考察了剪切速率、污泥浓度、污泥pH值、聚铁投加量因素对污泥流变性的影响。研究表明:污泥属于非牛顿流体,具有剪切稀化的特性;在实验污泥浓度范围内,污泥表观粘度随着其浓度增大而增大;pH值变化对污泥流变性质影响不同,酸性时体系粘度较小,随着pH的增大,表观粘度增大,碱性表观粘度较大;随着聚铁浓度的增大,污泥的表观粘度减小。这些实验现象可用颗粒的空间结构化理论及絮凝原理予以解释。     

铝酸钠溶液种分过程反应速率常数的影响因素

研究了铝酸钠溶液的分子比、苛性碱浓度、表面活性剂的浓度、温度和晶种添加量等因素对铝酸钠溶液种分的附聚反应速率常数的影响。结果表明：分子比和苛性碱浓度越大,铝酸钠溶液种分反应的速度变慢,反应速率常数减小;而温度升高、表面活性剂和晶种的添加量增加有利于反应速率常数的增大。     

铝酸钠溶液种分过程反应速率常数的影响因素

研究了铝酸钠溶液的分子比、苛性碱浓度、表面活性剂的浓度、温度和晶种添加量等因素对铝酸钠溶液种分的附聚反应速率常数的影响。结果表明:分子比和苛性碱浓度越大,铝酸钠溶液种分反应的速度变慢,反应速率常数减小;而温度升高、表面活性剂和晶种的添加量增加有利于反应速率常数的增大。     

γ—Fe2O3／聚丙烯酸锂复合微粒电流变效应的研究

采用反鼐液聚合法合成了γ－Ｆｅ２Ｏ３／聚丙烯酸锂复合微粒，将其悬浮分期于硅油等液体介质中形成电流变体，考察了外加电场强度及分散相粒子的化学结构、表面活性剂等对其剪切就力－剪切速率关系、动态及静态屈服应力大小的影响。     

Electrorheological properties of pumice/silicone oil suspension

Pumice particles-based electrorheological (ER) suspensions were prepared in silicone oil and its ER behavior was investigated as a function of shear rate, electric field strength, concentration and temperature. Sedimentation stabilities of suspensions were determined. ER activity of all the suspensions was observed to increase with increasing electric field strength, concentration and decreasing shear rate. Yield stress of pumice suspensions increased linearly with increasing applied electric field strength and with concentrations of the particles. The pumice suspensions show a typical shear thinning non-Newtonian viscoelastic behavior, in which viscosity of suspension decreased sharply with increasing shear rate. Effect of high temperature onto ER activity of pumice/silicone oil system was also investigated.     

疏水改性高分子溶液性能的研究及进展

疏水改性水溶性高分子溶液性能和流变特性的研究对于疏水改性高分子的结构设计、表征以及溶液性能探索和应用具有重要意义.从浓度、疏水结构、电解质、表面活性剂、剪切和温度等方面综述了疏水改性高分子溶液性能的研究及进展.     

Electrorheological properties and creep behavior of polyindole/poly(vinyl acetate) composite suspensions

In this study, electrorheological (ER) properties of polyindole (PIN) and polyindole/poly (vinyl acetate), (PIN/PVAc) conducting composites having different compositions were investigated. Conductivities and dielectric properties of these composites were determined. The particle sizes of the composites were determined by dynamic light scattering method. Suspensions of PIN and PIN/PVAc composites were prepared in silicone oil, at several concentrations (c = 5–25%, m/m) and their sedimentation stabilities were determined. Then the effects of dispersed particle concentration, shear rate, electric field strength, frequency, and temperature onto ER activities of suspensions were investigated. The flow times of these suspensions at various dc electric field strengths were measured. Further, creep tests were applied to the composite suspensions and a reversible viscoelastic deformation was observed.     

AM/NVP二元共聚物的溶液性能

采用自由基水溶液共聚法制备了丙烯酰胺／N-乙烯基吡咯烷酮二元共聚物(AM／NVP),使用旋转黏度计测定了共聚物水溶液的表观黏度,详细研究了聚合物浓度、聚合物组成、电解质浓度、温度、剪切速率、表面活性荆浓度等因素对聚合物溶液表观黏度的影响。结果表明,丙烯酰胺／N-乙烯基吡咯烷酮二元共聚物的水溶液具有一定的疏水缔合作用,聚合物溶液具有一定的耐温性和耐盐性。     

Thixotropy flow behaviour of solder and conductive adhesive pastes

This paper presents results on the thixotropic behavior of two suspensions; solder paste and isotropic conductive adhesives (ICAs). These materials are widely used as bonding medium in the electronics industry. Solder paste are metal alloys suspended in a flux medium while the ICAs consist of silver flakes dispersed in an epoxy resin. The thixotropy behavior was investigated through two rheological test; (i) hysteresis-loop test and (ii) steady shear rate test. In the hysteresis-loop test, the shear rate was increased from 0.01 to 10 s^–1 and then decreased from 10 to 0.01 s^–1. Meanwhile, in the steady shear rate test, the materials were subjected to a constant shear rate of 0.1, 1 and 10 s^–1 for a period of 1800 s. The solder paste exhibited a higher degree of structural breakdown compared to the isotropic conductive adhesives (ICAs). Both the suspensions showed a high degree of shear thinning behavior with time. Existing thixotropy model such as Weltman and Hahn were applied to understand the rate of structural change for solder paste and ICAs. The Weltman model (r0.95) showed a strong correlation with the experimental data compared to Hahn model (r0.95). The rate of structural breakdown increases with the value of B ₁, from Weltman model. The change in the microstructure of solder paste increases with the B ₁ but these trends were only observed for isotropic conductive adhesives at lower shear rates.     

温度对电流变流体流变行为的影响

研究了温度对硅铝酸盐、沸石、高分子、钛酸钡悬浮相电流变流体(ERF)抗剪强度及表观粘度的影响规律,结果表明,温度的作用规律主要受外加电场强度和悬浮相数量的影响,与剪切速率的大小无明显关系。温度升高,在高的外加场强下,硅铝酸盐系ERF和沸石系ERF的抗剪强度有明显峰值出现;高分子材料悬浮相ERF也有峰值现象;BaTiO3悬浮相ERF的抗剪强度则单调下降。     

温度对电流变液体流变行为的影响

研究了温度对硅铝酸盐、沸石、高分子、钛酸钡悬浮相电流变液体（ERF）抗剪强度及表观粘度的影响规律,结果表明,温度的作用规律主要受外加电场强度和悬浮相数量的影响,与剪切速率的大小无明显关系。温度升高,在高的外加场强下,硅铝酸盐系ERF和沸石系ERF的抗剪强度有明显峰值出现;高分子材料悬浮相ERF也有峰值现象;BaTiO3悬浮相ERF的抗剪强度则单调下降。