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对编织的八种Coolnise涤纶低弹丝纬编针织面料的热湿舒适性、顶破强力、耐磨性和透气性进行了测试,分析了纱线种类和织物结构对热湿舒适性和物理机械性能的影响。 相似文献
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防紫外线凉爽纤维的研究 总被引:2,自引:0,他引:2
用紫外线遮蔽剂与聚合物常规切片熔融共混纺制成改性纤维,再织成织物,着重研究了织物的紫外线遮蔽性、遮热性和穿着舒适性。结果表明:研究的织物不仅紫外线遮蔽率在90%以上,而且有优良的遮热性和穿着舒适性。 相似文献
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测试了Tencel纯纺和混纺织物的舒适性、悬垂性、折皱回复性、起拱变形性、耐磨性和起毛起球性等服用性能指标,同时与粘胶纤维织物、棉织物进行比较,表明Tencel织物优于其它织物,具有优良的服用性能。 相似文献
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吸湿速干舒适性纤维及织物 总被引:15,自引:0,他引:15
介绍了织物舒适性的一般原理、舒适性纤维生产技术 ,说明了舒适性纤维及织物的制作技术及吸水 -扩散 -速干原理。建议在纤维制造阶段进行物理改性 ,制造高吸水纤维 ,在聚合物合成阶段采用共聚等方法 ,解决纤维吸水排汗的问题 相似文献
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就新型假捻变形纱针织物的光泽、基本力学性能、悬垂性和热湿舒适性进行了较为全面的研究,并通过与棉织物进行对比分析,对新型假捻变形纱织物的仿棉效果作出了评价.试验结果表明:新型假捻变形纱织物与棉织物相比,正反射光强和漫反射光强较大,对比光泽度较大,具有较高的光泽度值;从基本力学性能测试结果上看,新型假捻变形纱织物的弯曲刚度、弯曲滞后量、剪切刚度、剪切滞后量、压缩比功小于棉织物,而其压缩功回复率大于棉织物,说明新型假捻变形纱织物的柔软性、成形性和弹性回复能力较棉织物好,但蓬松性不及棉织物;新型假捻变形纱织物的保暖性和透湿性能低于棉织物,透气导湿性能好于棉织物,两种织物的接触冷暖感相近. 相似文献
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采用尿素调节三水醋酸钠的相变温度到合适范围再添加膨胀石墨来降低过冷度,研制了高性能的三水醋酸钠-尿素-膨胀石墨混合相变材料,并对其在电地暖中的应用性能进行了研究。结果表明,当尿素质量分数为36.5%、膨胀石墨添加量为4%(质量)时,所得混合相变材料的熔化焓高达209.1 J/g,熔点在31.98℃,过冷度仅为2.04℃,热导率为2.349 W/(m·K),热可靠性良好;将用该混合相变材料制成的相变板安装在实验房的电地暖中时,实验房的热舒适度随着相变材料层厚度的增加而增加,但也带来加热时间和用电量的增加;当相变材料层厚度为10 mm时,电加热温度适宜设置在45℃;在热舒适度相当的条件下,有相变板的实验房与无相变板的参比房相比具有用电量小及电费低的优势。 相似文献
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Developing protective textile materials as barriers to liquid penetration using melt‐electrospinning
Electrospun polypropylene fiber webs and laminates were developed using melt‐electrospinning, to explore an alternative way of manufacturing protective clothing materials for agricultural workers. Electrospun polypropylene webs were fabricated in two levels of thickness. To examine the effect of lamination on the protection/thermal comfort properties, the webs were laminated on nonwoven fabric substrates. Barrier performance was evaluated for the electrospun webs and laminates, using two pesticide mixtures that represent a range of surface tension and viscosity. Effects of web thickness and lamination on air permeability and water vapor transmission were assessed as indications of thermal comfort performance. Penetration testing shows that electrospun polypropylene webs provide excellent barrier performance against the high surface tension challenge liquid, whereas the laminated fabrics of electrospun polypropylene webs exhibited performance of 90–100% for challenge liquids with varying surface tension. Air permeability of electrospun polypropylene webs decreased by ~20% because of the lamination and web thickness, but was still higher than most of the materials currently in use for protective clothing. Water vapor transmission of electrospun polypropylene webs reduced by up to 12% from the lamination and web thickness as well, but was still in a range comparable to woven work clothing fabrics. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 3430–3437, 2006 相似文献
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Electromechanical Behavior of PZT-Brass Unimorphs 总被引:3,自引:0,他引:3
Xiaoping Li Wan Y. Shih Ilhan A. Aksay Wei-Heng Shih 《Journal of the American Ceramic Society》1999,82(7):1733-1740
We have examined the static and dynamic electromechanical responses of PZT-brass (piezoelectric-nonpiezoelectric) plate unimorphs of various brass/PZT thickness ratios. The study was performed both experimentally and theoretically. The static measurements showed that, given a PZT layer thickness, there exists a brass/PZT thickness ratio that gives the unimorph the highest static displacement under an applied field. The effects of geometric shape and external loading on the displacement of the unimorphs were also examined. The dynamic measurements showed that, given a PZT layer thickness, the bending-mode resonance frequencies increase with an increasing brass/PZT thickness ratio. These results were in good agreement with the theoretical predictions that were obtained with the plate geometry. 相似文献
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G.C. Papanicolaou D.E. Mouzakis Th.V. Kosmidou G. Economopoulos 《Polymer Composites》2006,27(2):177-183
This article describes the results of a series of tests conducted to support the development of a semiempirical model, for predicting the mechanical degradation of a satin weave glass fabric composite, with through‐thickness damage in the form of a crack‐like edge‐centered notch. Test specimens were subjected to loading in both static three‐point bending and dynamic mechanical thermal analysis (DMTA) tests. The effect of both notch length and displacement rate, on the static and that of notch length on the dynamic behavior of the materials tested, was evaluated and compared with respective predictions, as derived from the application of the residual property model. A satisfactory agreement between the experimental results and theoretical predictions was observed in all cases. Scanning electron microscopy was applied to observe the failure topographical characteristics of the DMTA specimens that were off‐plane loaded. POLYM. COMPOS. 27:177–183, 2006. © 2006 Society of Plastics Engineers. 相似文献
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以石蜡为相变储能材料,石膏为基础材料,制备不同配比的石膏基-石蜡相变储能构件并利用现有热工测试方法进行了热工性能测试。将测试数据代入经验证过的相变模型模拟了北京地区被动式建筑中相变构件的应用效果,并对结果进行了优化处理。结果表明:随着石蜡含量的增大,相变构件的热导率随之减小;制备的四种配比中PCM质量分数为33%的相变构件在北京地区被动式建筑中应用效果最好,在过渡季中较传统建筑可节能10%;增大构件的热导率与提高墙体表面对流传热系数均可提高室内舒适度与节能效果,且对流传热系数的影响程度更大。 相似文献
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《Ceramics International》2022,48(3):3676-3684
The thickness of top coating is a crucial factor to characterize the performance of thermal barrier coating. Aiming at the difficulty of thickness measurement with conventional ultrasonic method, a noncontact method based on grating laser ultrasonic acoustic spectrum is proposed. Firstly, the dispersion curve of surface acoustic waves in thermal barrier coating was obtained. The numerical simulation of the established three-layer media model based on finite element method was then performed. Experiments with thermal barrier coating specimens in different thicknesses of top coating were conducted. The theoretical results and simulative results were corrected by ultrasound attenuation theory to fit experimental results. It is found that experimental results show great agreement with the theoretical curve and numerical simulation results after correction, which illustrates the usefulness and potential of the proposed method when applied to the thickness measurement of top coating in service. 相似文献
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以Fe2O3,NiO和Ag粉为主要原料,采用固相烧结工艺制备了NiFe2O4/Ag惰性阳极.采用X射线衍射和扫描电子显微镜对材料的组成和微观结构进行了研究,并测量了样品抗热震性、抗折强度、在冰晶石熔盐中的静态热腐蚀以及电解腐蚀速率,对其腐蚀过程作了初步探讨.结果表明:惰性阳极由NiO,NiFe2O4尖晶石和Ag三相组成.随着金属Ag含量的增多,惰性阳极样品在冰晶石熔盐中的静态热腐蚀速率增加,由于抗热震性和抗折强度有了大幅提高,电解腐蚀速率降低.静态热腐蚀和电解腐蚀呈现出物理化学溶解过程,而且由于金属银对晶界的强化作用,电解腐蚀由晶粒开始. 相似文献
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Lorenzo Bonetti Andrea Fiorati Andrea Serafini Guido Masotti Francesca Tana Agnese D'Agostino Lorenza Draghi Lina Altomare Roberto Chiesa Silvia Farè Massimiliano Bianchi Laura Giorgia Rizzi Luigi De Nardo 《应用聚合物科学杂志》2021,138(2):49645
The advent of 2D nanostructured materials as advanced fillers for polymer matrix composites has opened the doors to a plethora of new industrial applications requiring both electric and thermal management. Unique properties, in fact, can arise from accurate selection and processing of 2D fillers and their matrix. Here, we report an innovative family of nanocomposite membranes based on polyurethane (PU) and graphene nanoplatelets (GNPs), designed to improve thermal comfort in functional textiles. GNP particles were thoroughly characterized (through Raman, atomic force microscopy, high-resolution TEM, scanning electron microscope), and showed high crystallinity (ID/IG = 0.127), low thickness (D50 < 6–8 layers), and high lateral dimensions (D50 ≈ 3 μm). When GNPs were loaded (up to 10% wt/wt) into the PU matrix, their homogeneous dispersion resulted in an increase of the in-plane thermal conductivity of composite membranes up to 471%. The thermal dissipation of membranes, alone or coupled with cotton fabric, was further evaluated by means of an ad hoc system designed to simulate a human forearm. The results obtained provide a new strategy for the preparation of membranes suitable for technical textiles, with improved thermal comfort. 相似文献
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With the wide application of fiber-reinforced composite materials in aircraft, space structures and robot arms, the design and manufacture of composite joints have become a very important research area because they are often the weakest areas in composite structures. In this study, the effects of the adhesive thickness and tensile thermal residual stress on the torque capacity of tubular single lap joints were studied. The torque capacities of the adhesive joints were experimentally determined and found to be inversely proportional to the adhesive thickness. In order to match the experimental results to the theoretical analyses, the elastic-perfectly plastic material properties of the adhesive were used in the closed form solution. Also, the tensile thermal residual stresses of the joints were calculated by the finite element method and it was found that the thermal residual stresses could play an important role in the torque capacity when the adhesive thickness was large. 相似文献