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1.
杨威张明月任雅楠赵爽吴丝竹 《中国塑料》2013,27(9):1-5
总结了国内外剪切增稠液体材料的研究现状,从其流变特性、增稠机理及其应用于人体防护装备的发展等方面进行了综述。阐述了影响剪切增稠液体材料流变性能的一些因素的研究现状,包括分散相粒子的性质、分散介质的性质、亲水长链高分子的添加量和温度等。 相似文献
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柔性复合防刺材料的研制 总被引：1，自引：0，他引：1
对超高相对分子质量聚乙烯纤维制成的机织物、无纬布和非织造布3种材料进行了准静态试验和动态冲击试验,通过试验得出,用机织布和非织造布交替铺层作为防刺层,可以满足柔性防刺服对防刺的要求。 相似文献
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The objective of this study is to develop an advanced stab and/or ballistic proof material composed of shear thickening fluid (STF) and Kevlar composite fabric. In this study, we prepared STF using sphere silica and fumed silica as silica particles and ethylene glycol and polyethylene glycol (PEG 200) as medium fluid, respectively. And the rheological properties of the STF were investigated under different conditions. Also, we impregnated Kevlar fabrics with the STF, and investigated the stab and ballistic resistances of the targets layered by the STF impregnated Kevlar fabrics. From the results, we observed that the STF significantly showed the reversible liquid–solid transition at a certain shear rate, and the STF treatment significantly improved the stab and ballistic resistance of Kevlar fabric. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
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The equations of motion in conjunction with the free surface cell model have been solved numerically for the creeping flow of dilatant fluids through a fixed bed of spheres. The effect of the flow behaviour index (1 ≤ n ≤ 2) on the individual as well as the total drag coefficients is elucidated. Finally, the theoretical predictions have been validated using the scant experimental results available in the literature. 相似文献
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The momentum equations describing the steady cross‐flow of power law fluids past an unconfined circular cylinder have been solved numerically using a semi‐implicit finite volume method. The numerical results highlighting the roles of Reynolds number and power law index on the global and detailed flow characteristics have been presented over wide ranges of conditions as 5 ≤ Re ≤ 40 and 0.6 ≤ n ≤ 2. The shear‐thinning behaviour (n < 1) of the fluid decreases the size of recirculation zone and also delays the separation; on the other hand, the shear‐thickening fluids (n > 1) show the opposite behaviour. Furthermore, while the wake size shows non‐monotonous variation with the power law index, but it does not seem to influence the values of drag coefficient. The stagnation pressure coefficient and drag coefficient also show a complex dependence on the power law index and Reynolds number. In addition, the pressure coefficient, vorticity and viscosity distributions on the surface of the cylinder have also been presented to gain further physical insights into the detailed flow kinematics. 相似文献
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Zixuan Liu;Yuwei Zhao;Xiayun Zhang;Hongwei Tian;Bao Shi;Zhenhong Chen;Lixia Jia;Yuefen Han;Sainan Wei;Ruosi Yan; 《Polymer Composites》2024,45(10):9088-9102
This study reveals the impact resistance of shear thickening gel (STG) impregnated four-layer regular angle interlocking fabrics (AIF) composites. The effects of STG parameters, including reaction time, reaction temperature, and reaction ratio, on the rheological characterization and mechanical properties of STG/AIF flexible composites were investigated. The results show that the increase in STG parameters accelerated the formation of BO crosslink bonds within the STG. The energy storage modulus of STG increased by three orders of magnitude for a reaction temperature of 230°C, a reaction time of 9 h, and a reaction ratio of 12.5%. STG had an obvious shear thickening effect. The coupling effect of STG and AIF increases the inter-yarn friction. The shear thickening effect of STG and the deformation of AIF fabric synergistically absorbed the impact energy, and the energy absorption rate reached 95.6%. The material surface was not significantly damaged after the low-velocity impact. The STG/AIF flexible composites showed excellent impact energy absorption properties. 相似文献
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剪切增稠液体是指其表观粘度随剪切速率增加而变大的一类流体。工业生产中,剪切增稠的出现会阻碍输送管道,破坏生产设备。针对这种情况,人们对如何降低流体粘度造成的不利影响进行了大量研究。另一方面,剪切增稠液体是“液体防弹材料”的关键组成部分,并且在减震、控制方面也具有可观的应用潜力。该文采用原生粒径为50 nm 的SiO2和80～100 nm 的 CaCO3分别作为分散相,聚乙二醇（PEG）200为分散介质,采用超声分散法制备得到不同固含量的剪切增稠液。并通过纳米粒度仪和扫描电镜对分散相粒子团聚情况进行分析;通过应力控制流变仪分别对 SiO2/PEG200和 CaCO3/PEG200悬浮分散体系的稳态流变性能进行分析。结果表明,两种体系试样在测试中均出现剪切增稠现象,并且分散相质量分数越高,剪切增稠效果越明显;而高质量分数的 SiO2/PEG200体系的粘度变化范围更大,增稠现象更为明显。 相似文献
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为提高压裂液聚合物在海水中的耐温耐盐性能,以丙烯酰胺（AM）、2-丙烯酰胺基-2-甲基丙磺酸（AMPS）、4-丙烯酰吗啉（ACMO）和非离子疏水单体十八烷基聚氧乙烯醚甲基丙烯酸酯（OEMA）为单体,通过水溶液聚合法制备了海水基速溶耐温聚合物（PAOAA）。采用FTIR、1HNMR和SEM对其结构和形貌进行表征;通过增稠能力和流变性能实验对PAOAA作为压裂液进行性能测试。结果表明,PAOAA可在海水中2.0 min内溶解,质量分数0.8%的PAOAA溶液表观黏度为108 mPa·s,并表现出良好的耐温耐剪切性能,在100、170 s-1剪切速率下的终点黏度差别不大,不同温度下的终点黏度均＞50 mPa·s。单体AMPS中含有的磺酸基团屏蔽海水中的盐离子,提高了PAOAA的水溶性;杂环ACMO提高了PAOAA分子链的刚性;非离子疏水单体OEMA使PAOAA表现出缔合微区,提高了PAOAA的耐温性能,在三者的协同作用下,PAOAA表现出速溶耐温性能。 相似文献
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摘要：简述了有利凯玛公司的新一代非离子增稠剂Promidium^TM LTs的性质,该产品基于专利的技术平台,对各种难增溶的表面活性剂体系具有独特的增稠效果,并且可大大改善最终产品的触变流动性。 相似文献
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利用废弃粉煤灰制备压裂液用硼交联剂的研究 总被引：1，自引：0，他引：1
利用废弃粉煤灰制备聚硅酸,以聚硅酸、硼砂为原料,合成了一种高温延缓型交联剂.采用单因素法,通过测定硼交联剂性能,优选出最佳合成工艺参数为:硼砂5wt%,配体28.5wt%,反应温度80 ℃,催化剂1.5wt%.并对合成目标产物进行了红外光谱表征,其交联的HPG(羟丙基胍胶)冻胶压裂液的高温流变性评价表明,当胍胶浓度为0.45wt%,交联比为100∶0.8(体积比)时,110 ℃,170 s-1的剪切速率条件下,剪切2 h,粘度达到130 MPa·s以上,证明该交联剂对HPG具有较好的交联效果,老化破胶实验表明其交联的压裂冻胶易破胶返排,残渣低. 相似文献
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Nitin Kumar;Swati Bishnoi;Anup K. Ghosh;Abhijit Majumdar;Sudip K. Pattanayek; 《Polymer Composites》2024,45(9):8469-8485
Shear thickening fluid (STF), a highly concentrated mixture of nanosized silica particles in polyethylene glycol (PEG) is characterized by its quick transition to a stiff, solid-like form under high shear rates. In this study, the modified Stöber synthesis approach was used for synthesizing the monodispersed spherical 300 nm silica nanoparticles. The rheological properties of the STF formulated using different silica loading were characterized. The Takshak model was tested to assess the rheological properties. The effect of the STFs on the impact resistance and yarn pull-out force of the Kevlar® 802 fabric was determined. The uniformity in size of the silica nanoparticles facilitated more efficient packing within the fluid matrix, resulting in the formation of networks or structures that enhance shear thickening behavior. The STF with 70% silica exhibited the best peak viscosity of 45.8 Pa.s. Upon impregnation of this STF onto the Kevlar, a significantly high energy absorption (478.4%) compared to neat Kevlar, was observed. Moreover, the yarn pull-out force for this system was found to be very high (435.8%). The reasons for the enhancement of the properties are explained. The novelty of this work lies in the synthesis of silica particles, analysis of the rheological properties, and interrelating the rheological properties with the characteristic parameters to define the impact characteristics. The improved properties underscore the suitability of synthesized STF for impact resistance applications. 相似文献
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Stuart W. Charles 《Chemical Engineering Communications》1988,67(1):145-180
Many of the properties of magnetic fluids and magnetic fluid composites can be explained by the presence of aggregates of particles. In this paper, the experimental methods by which these properties can be studied are reviewed. Theoretical methods of predicting these properties, and the particle size and magnetic field dependence of the formation of aggregates are also presented. 相似文献
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《国际智能与纳米材料杂志》2013,4(4):212-228
The use of carbon nanotubes in composite hard armor is discussed in this study. The processing techniques to make various armor composite panels consisting of Kevlar®29 woven fabric in an epoxy matrix and the subsequent V50 test results for both 44 caliber soft-point rounds and 30 caliber FSP (fragment simulated projectile) threats are presented. A 6.5% improvement in the V50 test results was found for a combination of 1.65 wt% loading of carbon nanotubes and 1.65 wt% loading of milled fibers. The failure mechanism of carbon nanotubes during the ballistic event is discussed through scanning electron microscope images of the panels after the failure. Raman Spectroscopy was also utilized to evaluate the residual strain in the Kevlar®29 fibers post shoot. The Raman Spectroscopy shows a Raman shift of 25 cm?1 for the Kevlar®29 fiber utilized in the composite panel that had an enhancement in the V50 performance by using milled fiber and multi-walled carbon nanotubes. Evaluating both scenarios where an improvement was made and other panels without any improvement allows for understanding of how loading levels and synergistic effects between carbon nanotubes and milled fibers can further enhance ballistic performance. 相似文献
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Mit Rita Goswami Prayas Singh Pankaj Chamoli Sumit Bhardwaj Kuldeep Kumar Raina Ravi Kumar Shukla 《应用聚合物科学杂志》2021,138(43):51260
ZnO rice like nonarchitects are grafted on the graphene carbon core via a rapid microwave synthesis route. The prepared grafted systems are characterized via XRD, SEM, RAMAN, and XPS to examined the structural and morphological parameters. Zinc oxide grafted graphene sheets (ZnO-G) are further doped in β-phase of polyvinylidene fluoride (PVDF) to prepare the polymer nanocomposites (PNCs) via mixed solvent approach (THF/DMF). β-phase confirmation of PVDF PNCs is done by FTIR studies. It is observed that ZnO-G filler enhances the β-phase content in the PNCs. Non-doped PVDF and PNCs are further studied for rheological behavior under the shear rate of 1–100 s−1. Doping of ZnO-G dopant to the PVDF matrix changes its discontinuous shear thickening (DST) behavior to continues shear thickening behavior (CST). Hydrocluster formation and their interaction with the dopant could be the reason for this striking DST to CST behavioral change. Strain amplitude sweep (10−3% -10%) oscillatory test reveals that the PNCs shows extended linear viscoelastic region with high elastic modulus and lower viscous modulus. Effective shear thickening behavior and strong elastic strength of these PNCs present their candidature for various fields including mechanical and soft body armor applications. 相似文献
18.
Ping Wang Lulu Li Kun Qian Kejing Yu Yaoliang Zhang Yunpeng Xia Zhongwei Zhang Ziming Xiong 《Polymer Engineering and Science》2023,63(1):55-64
The viscosity of shear thickening fluid (STF) changes significantly with low concentrations of additives. However, existing research has suggested that there has not been any consistent enhancement mechanism of additives. The possible reason for this research gap is that existing research has focused on the effect of the shape and content of additives on shear thickening (ST) performance, whereas the friction characteristics of additives on ST performance have not been considered. Accordingly, nanoparticle-enhanced STF with various friction characteristics of ZnO was synthesized in this study to investigate the enhancement mechanism of additives. The aspect ratio of ZnO with different shapes was obtained through SEM analysis. The friction characteristics of ZnO were examined. Lastly, the rheological behavior of reinforced STFs was evaluated. The results indicated that ST performance was enhanced compared with that of neat STF, which was significantly dependent on the friction characteristics of ZnO. 相似文献
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The carbon fabric composites filled with several nanoparticles were prepared by dip‐coating and hot press molding technique. The friction and wear behavior of the resulting composites were studied systematically using a block‐on‐ring arrangement. Experimental results showed that the optimal content of nanoparticles as fillers contributed to improve the tribological properties of the carbon fabric composites. Moreover, the friction and wear properties of the fabric composites were closely dependent with the sliding conditions. The differences in the transfer film formed on the counterpart surface during the friction process also accounted for the friction and wear behavior of carbon fabric composites. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献