Sorin Miclos  Laurentiu Baschir  Dan Savastru  Roxana Savastru  Ion Lancranjan 《Macromolecular Symposia》2020,389(1)

The concentration of infiltrated water molecules into polymer matrix of composite materials is an important mechanical and chemical functional parameter of smart composite materials during exploitation in various research, medical, industrial, and security applications and it is important to design a setup as simple and as efficient as possible for measuring and monitoring this important parameter. The paper presents simulation/design results obtained using self‐interference long period grating fiber sensors in measuring and monitoring the concentration of infiltrated water molecules into polymer composite materials. The investigated long period grating fiber sensors are used as they are or mounted in interferometric setups. Self‐interference long period grating fiber sensors are manufactured by inscribing diffraction gratings into or on single mode commercial communication optical fibers and are used in smart composite materials as signal generators of their feedback loop being embedded into the polymer matrix.  相似文献   

    

Daniel Grinberg  Sabrina Siddique  Minh‐Quyen Le  Richard Liang  Jean‐Fabien Capsal  Pierre‐Jean Cottinet 《Journal of Polymer Science.Polymer Physics》2019,57(2):109-115

Additive manufacturing (AM), otherwise known as three‐dimensional (3D) printing, is driving major innovations in many areas, such as engineering, manufacturing, art, education, and medicine. Although a considerable amount of progress has been made in this field, additional research work is required to overcome various remaining challenges. Recently, one of the actively researched areas lies in the AM of smart materials and structures. Electroactive materials incorporated in 3D printing have given birth to 4D printing, where 3D printed structures can perform as actuating and/or sensing systems, making it possible to deliver electrical signals under external mechanical stimuli and vice versa. In this paper, we present a lightweight, low cost piezoelectric material based on the dispersion of inorganic ferroelectric submicron particles in a polymer matrix. We report on how the proposed material is compatible with the AM process. Finally, we discuss its potential applications for healthcare, especially in smart implants prostheses. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019 , 57, 109–115  相似文献   

    

Qi Zhang  Da‐Hui Qu  He Tian 《Advanced Optical Materials》2019,7(16)

Stimuli‐responsive materials, especially those that can respond to light stimuli, are highly attractive and promising for scientists working in many fields. Recently, the emerging supramolecular polymers and materials are found to be versatile and reliable in the construction of smart soft materials owing to their dynamic nature. Aiming to regulate the dynamic properties of supramolecular polymers by remote external light stimuli, previous efforts have focused on the photo‐controlled assembly/disassembly of supramolecular polymers, showing several expectable applications of light‐responsive supramolecular materials. In this progress report, the recently emerging light‐responsive supramolecular polymers are summarized which exhibit conceptually new functions and applications beyond reversible disassembly/reassembly, such as light‐regulated morphology transformation, tunable fluorescent emission, switchable self‐healing ability, muscle‐like actuation, and programmed shape memory. Remaining questions and challenges to design and construct these smart optical materials are discussed in detail based on molecular engineering strategy. Additionally, several unsolved questions for light‐regulated supramolecular polymers are given to discuss the possible opportunities of this field.  相似文献   

    

Elvira Pantuso  Giovanni De Filpo  Fiore Pasquale Nicoletta 《Advanced Optical Materials》2019,7(16)

Stimuli‐responsive polymer membranes have gained particular attention for the ability to tune opportunely their physicochemical properties under the application of an external stimulus. Heat, pH value, ionic strength, pressure, humidity, electric and magnetic fields, antigen/antibody interactions, chemical reactions, and light can be used as triggers for specific responses in polymer membranes. In particular, light is a fascinating stimulus, as it is a green energy, which can be modulated in a precise and convenient way. In addition, it allows remote and contactless interactions without changing the original chemical environment. This review reports recent progresses in light‐responsive polymer membranes with particular attention to chemical groups and responsive mechanisms.  相似文献   

    

Zhengsong Fang  You Zhang  Xuanhe Hu  Xinlong Fu  Liming Dai  Dingshan Yu 《Angewandte Chemie (International ed. in English)》2019,58(27):9289-9289

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Thamiris Paiva  Lorena Vieira  Príamo Melo  Mrcio Nele  Jos Carlos Pinto 《大分子反应工程》2019,13(1)

Schistosomiasis is one of the major public health problems worldwide. Even though this is a common illness among preschool children in poor countries, treatment is carried out mainly through the administration of praziquantel tablets, which has some disadvantages, such as the strong bitter taste. As an alternative to overcome this problem, the development of new encapsulated praziquantel formulations is demanded. For this reason, suspension polymerizations are carried out for the in situ encapsulation of praziquantel into polymer microparticles, using methyl methacrylate (MMA) and cationic compounds (diethylaminoethyl methacrylate, DEAEMA, and dimethylaminoethyl methacrylate, DMAEMA) as comonomers. This technique allows for the preparation of polymer microparticles with high encapsulation efficiencies (>90%) with characteristic sizes ranging from 0.5 to 1500 µm. Drug release profiles show that praziquantel is released from poly(methyl methacrylate) microparticles slowly due to the existence of strong diffusional resistance. On the other hand, the addition of cationic comonomers renders polymer particles sensitive to pH variations, allowing for faster release of praziquantel in acidic environments, as found in the stomach.  相似文献   

    

《physica status solidi (a)》2017,214(1)

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Michael Philpott  Jonathan Doran 《Fiber and Integrated Optics》2016,35(2):86-93

ABSTRACT

The connected home is a critical part of the network—but one that has seen little in the way of true investment in recent years. With customer loyalty and churn directly linked to quality of experience, this is a part of the network that no players in the supply chain can afford to ignore any longer. Beyond broadband experience, the addition of smart technology to the connected home also represents one of the biggest revenue growth areas in the consumer telecoms market for some time. From both a churn-reduction and a revenue-growth perspective, investment in the connected home network must accelerate. This article outlines the key trends identified by Ovum in the connected home space for 2016 and beyond.  相似文献   

    

Tatyana Petrova  Elisaveta Kirilova  Wilfried Becker  Natasha Vaklieva‐Bancheva  Jordanka Ivanova 《ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik》2016,96(11):1280-1290

In the present paper the behavior of the piezoelectric response of smart lightweight structures consisting in a piezoelectric patch over a host layer under static load and affected by electrical load at environment conditions is studied. The shear lag analysis is applied to investigate the possible interface delamination and to calculate analytically the interface debond length. It has been demonstrated that the roots of respective characteristic equation play a leading role for place of the interface delamination in the overlap zone of the structure under consideration. This leads to the conditions for the actual deboning existence and opens the possibility of an optimal analysis. The proposed approach consists in involving the shear lag model in a global optimization framework where simultaneously the investigation of all model parameters can be carried out. The solution of that problem gives the values of the parameters at which a vanishing/minimal debond length is ensured. The efficiency of the proposed method is proved on three different examples as the optimal geometrical characteristics and effects ensuring no delamination in the structures are obtained.  相似文献   

    

Seyyed M. Hasheminejad  Vahid Rabbani  Mahdi Alaei-Varnosfaderani 《基于设计的结构力学与机械力学》2016,44(3):189-211

The linear 3D piezoelasticity theory in conjunction with the versatile transfer matrix approach and the wave equation for the internal acoustic domain are employed for active non-stationary vibroacoustic response control of an arbitrarily thick, tri-laminate, fluid-filled, simply supported, piezocomposite cylindrical tank, excited by arbitrary (non-axisymmetric) time-dependent on-surface mechanical loads. The smart structure is composed of a supporting core layer of functionally graded orthotropic material perfectly bonded to inner and outer spatially distributed radially polarized functionally graded piezoceramic sensor and uniform force actuator (FGPM) layers. Active vibration damping is implemented by transferring the accumulated voltage on the sensor layer to the piezoelectric actuator layer in context of proportional and derivative control laws. Durbin's numerical inverse Laplace transform scheme is utilized to calculate the time response histories of the relevant interface displacement/stress components, center-point acoustic pressure, and actuator voltage, for selected loading configurations (i.e., concentrated step, impulse, and moving external loads). Numerical simulations demonstrate the effectiveness of the adopted distributed sensing/actuation configuration together with the active damping control strategy in suppressing the vibroacoustic response of a three-layered (Ba₂NaNb₅O₁₅/Al/PZT4) water-filled piezoelastic cylindrical tank. Limiting cases are considered and the validity of results is established by comparison with the available data as well as with the aid of a commercial finite element package.  相似文献