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碳纳米管/聚合物基复合材料的研究进展 总被引：1，自引：0，他引：1
综述了碳纳米管/聚合物基复合材料的研究进展;介绍了碳纳米管/聚合物基复合材料的制备方法：共混法、原位聚合法、溶胶-凝胶法,以及碳纳米管/聚合物基复合材料的优异性能及应用;并评述了碳纳米管/聚合物基复合材料今后的研究发展趋势。 相似文献
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模板技术是制备介观尺度下具有多重结构材料的简单有效方法。本工作围绕纳米微球及其组装结构，一维纳米纤维及其组装结构而开展。其中重点关于核-壳结构凝胶微球的制备，并以此为模板制备包覆复合微球和中空微球，实现复合微球的形貌和特征尺寸的控制。通过化学改性对单分散聚苯乙烯胶体微粒进行处理，制备了具有核-壳结构的单分散凝胶粒子。以核-壳结构凝胶粒子为模板，制备了二氧化钛包覆聚苯乙烯核壳结构的复合粒子及其中空的二氧化钛粒子。发现在无机前体的溶胶凝胶过程中，电场能诱导复合粒子表面形成贯穿的多孔结构。同样思路，制备了二氧化硅、导电聚苯胺及其复合的核-壳结构和相应的中空微球。对聚苯乙烯胶体晶进行化学改性，制备了核-壳结构的胶体晶凝胶。以此为模板，与第二种具有响应特性凝胶进行复合，得到了敏感特性的胶体晶凝胶。并研究了此复合凝胶的形态及外场响应特性。以多孔氧化铝膜为模板，制备一维结构及其阵列体系。通过调节孔的润湿性，调节一维结构的形态（纤维或中空结构）并可调节双组分核-壳结构纤维的内外相相反转。 相似文献
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王玮 《科技成果管理与研究》2016,(5):1-2
蹇锡高,中国工程院院士,大连理工大学教授.主要从事聚合改性和耐热高分子材料研究.从分子结构设计结构出发,研制新单体和新聚合物,研究合成反应路线、合成工艺、反应动力学和机理,研究聚合物的结构/性能关系,开发综合性能优异的新型耐热高分子材料,并开展新型高分子材料的加工、应用研究.2003年,其主持完成的"含二氮杂萘酮联苯结构新型聚醚砜酮及其制备法"获技术发明二等奖;2012年,主持完成的"杂萘联苯聚醚腈砜系列高性能树脂及其应用新技术"获得国家技术发明二等奖.为发展我国高性能工程塑料作出了重要贡献. 相似文献
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近些年以来,纳米碳纤维凭借着其自身独特的化学特性以及物理特性逐渐的引起了当今人们对它的热切关注,并调动起了人们研究纳米碳纤维的积极性。本文采用先进的制备纳米碳纤维的方法,即聚合物共混纺丝法,将直径小于两百纳米的纳米碳纤维成功的研制了出来,并深入的对共混聚合物的纺丝工艺条件、相容性,以及碳化温度对产物性能、结构和形态的影响进行了探讨。除此之外,还将此实验所制备出的纳米碳纤维加入到环氧树脂当中,来研制出纳米碳纤维与环氧树脂的复合材料,同时简要的论述了纳米碳纤维的添入对复合材料性能及结构的影响。 相似文献
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聚合物改性沥青能够弥补沥青材料本身的不足,是改善沥青路用性能的有效途径和方向。本文概述了聚合物改性沥青的研究进展及其性能评价,包括聚合物改性剂的种类、聚合物改性沥青的制备方法及其性能评价。 相似文献
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具有独特结构与优异性能的碳纳米管(CNTs)已成为聚合物复合材料的理想添加剂。介绍了碳纳米管/聚合物复合材料的制备方法及其在机械、电学、光学等领域的应用潜能,并探讨了这类复合材料研究中面临的一些问题及今后的应用前景。 相似文献
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挤扩支盘桩在杭州地区的现场试验 总被引：1，自引：0，他引：1
挤扩支盘桩是一种通过专用液压挤扩设备可改变桩截面的新型灌注桩 .这种桩型已经在其它地区得到了推广 ,而在有较厚软土层的杭州地区还未使用 .本文通过支盘桩与普通灌注桩的原位试验对比与分析 ,认为这种桩型在杭州地区还是大有可为的 相似文献
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文章阐述仿生学的诞生、仿生设计和现代工业设计中的仿生的应用.详细介绍仿生在旅游工艺品造型创意中的应用,得出运用仿生进行旅游工艺品的造型创意设计,可以加深产品的自然性、趣味性和环保性,从而更好地创造具有浓郁地域文化内涵的特色旅游工艺品品牌.以达到合理开发旅游资源,创造人、自然、工艺品和谐共存的目的. 相似文献
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Jia-Nan Ma Yong-Lai Zhang Dong-Dong Han Jiang-Wei Mao Zhao-Di Chen Hong-Bo Sun 《国家科学评论(英文版)》2020,7(4):775
Graphene-based actuators featuring fast and reversible deformation under various external stimuli are promising for soft robotics. However, these bimorph actuators are incapable of complex and programmable 3D deformation, which limits their practical application. Here, inspired from the collective coupling and coordination of living cells, we fabricated a moisture-responsive graphene actuator swarm that has programmable shape-changing capability by programming the SU-8 patterns underneath. To get better control over the deformation, we fabricated SU-8 micropattern arrays with specific geometries and orientations on a continuous graphene oxide film, forming a swarm of bimorph actuators. In this way, predictable and complex deformations, including bending, twisting, coiling, asymmetric bending, 3D folding, and combinations of these, have been achieved due to the collective coupling and coordination of the actuator swarm. This work proposes a new way to program the deformation of bilayer actuators, expanding the capabilities of existing bimorph actuators for applications in various smart devices. 相似文献
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我们仿造有超疏水性质和自清洁功能荷叶表面的微米鄄纳米双重结构,通过分子设计和大分子在溶液及凝聚过程中分子形态的控制,采用一步法浇铸成膜制备出相应的高分子仿生表面,得到了可与荷叶相媲美的超疏水性质和荷叶所不具备的疏油特性,该表面具备自清洁功能和“自修复”功能。 相似文献
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In this paper, an adaptive output feedback fault tolerant control (FTC) based on actuator switching is proposed for a class of single-input single-output (SISO) nonlinear systems with uncertain parameters and possible actuator failures, for which a set of healthy actuators are available as backups. While high-gain K-filters are utilized to estimate the unmeasured states, an adaptive control law is designed to compensate for the parameter uncertainties and certain actuator failures, an actuator switching strategy based on a set of appropriately designed monitoring functions (MFs) is proposed to tackle those serious actuator failures, make tracking error satisfy prescribed transient and steady-state performance and guarantee closed-loop signal boundedness. 相似文献
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《Journal of The Franklin Institute》2018,355(18):9298-9320
In this paper, an innovative piezo-hydraulic actuator (PHA) is considered that is intended to realize a fully variable valve control in camless combustion engines. A nonlinear model of the hydraulic system part is presented along with linear models of the remaining system parts. Accurate tracking of desired valve trajectories as well as soft landing despite disturbance forces and measurement noise is achieved using a combined control strategy. It consists of an input–output linearization of the nonlinear part as well as feedforward and linear quadratic integral (LQI) feedback control of the linear system part. Given measurements of the valve spool and engine valve positions, a Cascaded Extended Kalman Filter (CEKF) structure provides estimates for the immeasurable states. Simulation results confirm the effectiveness of the proposed approach. 相似文献
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《Journal of The Franklin Institute》2023,360(10):6804-6826
In this research, a hybrid adaptive bionic fuzzy control strategy is developed for a class of complicated nonlinear multiple-input-multiple-output (MIMO) systems with dead-zone input. The first component of the bionic adaptive controller is a general phrase for tunning system parameters depending on the present state, and the second component is a trend-based compensation for adjusting the system parameters. This technique makes the system more intelligent and boosts its anti-interference capabilities. The stability and convergence are analyzed using the Lyapunov synthetic method, and thus the parameter restrictions of the MIMO system are provided. Finally, the strong anti-interference of the system is verified by the simulations. 相似文献
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《Journal of The Franklin Institute》2022,359(9):4260-4287
In this paper, we formulate and study a reliability-performance balancing problem (RPBP) for long-term operational and unattended control systems with degrading actuators. It preliminarily explores a new type of autonomous maintenance method to extend the useful lifetime of the control system. The actuator, as the crucial component of a control system, executes calculated control actions and thereby is often exposed to the high-load working environment. As the actuator degrades, the control action will gradually alter with increasing magnitude to maintain the desired control performance, but this will accelerate the actuator degradation and thus reduce the useful lifetime (use reliability) of the control system. Therefore, conditionally balancing the control performance and use reliability is meaningful, for which a novel dynamic regulation strategy under the model predictive control (MPC) framework is proposed. Specifically, we model the actuator degradation using a diffusion Wiener process coupled with the control action or system state, and the corresponding actuator reliability is derived. By fusing the degradation model and system dynamics, a degradation-incorporated state space (DISS) model is formulated, in which the basic idea is to consider the actuator degradation as an extended state variable and to control it accordingly. Based on the DISS model, a mixed-index nonlinear MPC integrated with a weight tuning strategy is proposed to achieve a satisfactory balance between control performance and use reliability in the presence of actuator degradation. Further, the reference curve and the upper bound of actuator degradation are given for constructing the objective function and the constraint in the MPC optimization problem. An illustrative example is presented to demonstrate the availability of the proposed method. 相似文献
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仿生学是在认知概念上使我们得以最恰当地把握人与自然的关系，通过科学活动的现代结构体系，加以快速发展的学科。在航天科技的发展过程中，科学探索和技术应用同时存在，大量的科学问题转化为实现的方法和工程技术问题。认识的超前、系统的庞大、投入的巨大和技术转化滞后，会在技术上呈现出螺旋式上升的超前性和延迟效应。系统的复杂性和解决问题的难度，需要边缘学科、交叉学科的渗透和融入来解决创新与突破的问题。通过仿生科学对航天技术的启示分析，仿生学的发展为技术的突破和复杂问题的解决，提供了一条有效的途径和最大的可能。由航天技术的发展认识仿生科学的价值和重要性，对仿生学的发展有着重要的启示作用。 相似文献