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Electroactive polymer Actuators and Devices (EAPAD) 2009

作者： Di Spigna, N. Chakraborti, P. Yang, P. Ghosh, T. Franzon, P. Dept. of Electrical and Computer Engineering NCSU Raleigh NC 27695 United States Dept. of Textile Engineering Chemistry and Science NCSU Raleigh NC 27695 United States Fiber and Polymer Science Raleigh NC 27695 United States

ISBN: (纸本)9780819475473

The development of a multiline, refreshable Braille display will assist with the full inclusion and integration of blind people into society. The use of both polyvinylidene fluoride (PVDF) film planar bending mode actuators and silicone dielectric elastomer cylindrical tube actuators have been investigated for their potential use in a Braille cell. A liftoff process that allows for aggressive scaling of miniature bimorph actuators has been developed using standard semiconductor lithography techniques. The PVDF bimorphs have been demonstrated to provide enough displacement to raise a Braille dot using biases less than 1000V and operating at 10Hz. In addition, silicone tube actuators have also been demonstrated to achieve the necessary displacement, though requiring higher voltages. The choice of electrodes and prestrain conditions aimed at maximizing axial strain in tube actuators are discussed. Characterization techniques measuring actuation displacement and blocking forces appropriate for standard Braille cell specifications are presented. Finally, the integration of these materials into novel cell designs and the fabrication of a prototype Braille cell are discussed. © 2009 SPIE.

关键词： Silicones

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Recent Progress of Graphene fiber/Fabric Supercapacitors:From Building Block Architecture,fiber Assembly,and Fabric Construction to Wearable Applications

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Advanced fiber Materials 2023年第3期5卷 896-927页

作者： Tuxiang Guan Zemei Li Dianchun Qiu Guan Wu Jian Wu Liping Zhu Meifang Zhu Ningzhong Bao State Key Laboratory of Materials‑Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009People’s Republic of China National Engineering Lab for Textile Fiber Materials and Processing Technology School of Materials Science and EngineeringZhejiang Sci-Tech UniversityHangzhou 310018People’s Republic of China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620People’s Republic of China

High-performance fiber-shaped power sources are anticipated to considerably contribute to the continuous development of smart wearable *** one-/two-dimensional(1D/2D)frameworks constructed from graphene sheets,graphene fibers and fabrics inherit the merits of graphene,including its lightweight nature,high electrical conductivity,and exceptional mechanical *** as-fabricated graphene fiber/fabric flexible supercapacitor(FSC)is,therefore,regarded as a promis-ing candidate for next-generation wearable energy storage devices owing to its high energy/power density,adequate safety,satisfactory flexibility,and extended cycle *** gap between practical applications and experimental demonstrations of FSC is drastically reduced as a result of technological *** this end,herein,recent advancements of FSCs in fiber element regulation,fiber/fabric construction,and practical applications are methodically reviewed and a forecast of their growth is presented.

关键词： Graphene fibers/fabrics Flexible supercapacitor Element regulation fiber/fabric construction Wearable application

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The effects of QAC-silane antimicrobial agents on the physical, mechanical, and thermophysiological properties of novel elastomeric fabrics for burn pressure garments

The effects of QAC-silane antimicrobial agents on the physic...

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fiber Society 2015 Fall Meeting and Technical Conference - fibers: Where Tradition Meets Innovation

作者： Varan, Nilufer Y. Caydamli, Yavuz Hudson, Sam M. Spontak, Richard J. Tonelli, Alan E. Engineering Faculty Department of Textile Engineering Pamukkale University Kinikli Kampusu Denizli20017 Turkey Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University College of Textiles Campus Box 8301 RaleighNC27695 United States Department of Chemical and Biomolecular Engineering North Carolina State University Engineering Building I Campus Box 7905 RaleighNC27695 United States

In this study, novel nylon/spandex elastomeric burn pressure garments were developed with a durable antimicrobial performance using silane and quaternary ammonium compounds (QAC's). A series of physical, mechanical and thermophysiological properties were tested before and after the application of the antimicrobial finish, including air permeability, stiffness, drapeability, bursting strength and extensibility, thermal resistance (Rct) and thermal insulation (in clo units). Antimicrobial tests were performed after 50 washing cycles using AATCC 100 Test Method, and they showed a 99% reduction in bacterial activity for those fabrics treated with the QAC-Silane antimicrobial agents. Physical, mechanical and thermophysiological properties were tested after antimicrobial treatments. A small significant increase was observed in terms of thermal resistance (Rct) (Tog) and isolation (It) (clo) properties for treated fabrics samples. The air permeability, bursting strength and drapeability showed a small significant decrease after antimicrobial finishing, while the elastomeric fabric showed a small but significant increase for fabric stiffness. These results confirm that when these novel pressure garments are used by burn patients, they will not only decrease the incidence of infection but will also provide comfort during prolonged use.

关键词： Antimicrobial agents

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Recycling Of PP/LDPE blend: Miscibility, thermal properties, rheological behavior and crystal structure 74

Recycling Of PP/LDPE blend: Miscibility, thermal properties,...

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74th Annual Technical Conference and Exhibition of the Society of Plastics Engineers, SPE ANTEC Indianapolis 2016

作者： Aumnate, Chuanchom Spicker, Claudia Kiesel, Raphael Samadi, Majid Rudolph, Natalie Mechanical Engineering Department Polymer Engineering Center University of Wisconsin-Madison WI United States Textile Science Department of Design Studies and Materials Science Graduate Program University of Wisconsin-Madison WI United States

ISBN: (纸本)9780692719619

Blending of plastics used in packaging is an interesting approach for recycling or upcycling. Therefore, this study focused on the effects of processing on the properties of recycled PP and PP/LDPE blends. MFI measurements, Differential Scanning Calorimetry (DSC) and hot-stage polarized optical microscopy techniques were used to investigate the miscibility of PP/LDPE blends based on the thermal properties, degree of crystallinity, crystallization and morphology development in the blends. The MFI indicates, that PP and PP/LDPE blends are marginally sensitive to degradation at common processing conditions. The degree of crystallinity of the blends decreases with an increase of the LDPE content. Furthermore, the spherulite growth rate and crystal size of PP decrease with an increase of LDPE content. The shifts of crystallization temperatures from the DSC measurement, in conjunction with the crystallization kinetics, indicate that PP/LDPE (25 wt% LDPE) is partially miscible.

关键词： Crystal structure

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Inclusion Compounds as a Means to Fabricate Controlled Release Materials

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ACS Symposium Series 1999年 728卷 131-150页

作者： Huang, L. Tonelli, A.E. Fiber and Polymer Science Program College of Textile North Carolina State University Raleigh NC 27696-8301 United States

Certain molecular hosts, such as urea, thiourea, perhydrotriphenylene, and cyclodextrins, can form crystalline inclusion compounds (ICs) during their cocrystallization with appropriate guest molecules. The IC host molecules crystallize into a three-dimensional lattice which surrounds and isolates the included guest molecules into well-defined cavities. These IC crystals may be thought of as host molecule crystalline containers whose contents are the included guest molecules. Until the IC crystals are disrupted by melting or dissolution, the included guest molecules are kept isolated from the environment. Both small-molecule and polymer guests may be included in ICs. When embedded in a carrier polymer phase and subsequently treated with a solvent for the IC host, the included guest molecules are released and coalesced into the carrier-polymer phase producing a guest-carrier polymer molecular composite. In the present report we describe the fabrication of several such molecular composites using ICs containing either small-molecule or polymer guests. Their characterization is also described, and several controlled release applications are suggested.

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Novel nanofibrous membranes with antibacterial functions

Novel nanofibrous membranes with antibacterial functions

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2011 Spring Conference of the fiber Society

作者： Wang, Dong Xu, Wei Lin Sun, Gang College of Materials Science and Engineering Wuhan Textile University Wuhan 430073 China Fiber and Polymer Science University of California Davis CA 95616 United States U. S. Pacific Nonwovens Industry Ltd Hong Kong

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Effects of saponification and molecular weight of PVA on electrospinning

Effects of saponification and molecular weight of PVA on ele...

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International fiber Conference 2006: Extreme and Aesthetic textiles, IFC 2006

作者： Kim, Mi Nae Kim, Hyungsup Cho, Kwang-Soo Yeum, Jeong Hyun Department of Textile Engineering Konkuk University Seoul Korea Republic of Department of Polymer Science College of Engineering Kyungpook National University Daegu Korea Republic of Department of Natural Fiber Science College of Agriculture and Life Sciences Kyungpook National University Daegu Korea Republic of

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Supramolecular Self-assembly Behaviors of Asymmetric Diblock Copolymer Blends with Hydrogen Bonding Interactions between Shorter Blocks Modelled by Yukawa Potentials

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Chinese Journal of polymer science 2021年第11期39卷 1502-1509页

作者： Xu Zhang Jialiang Chen Lin Xu Tianxi Liu Innovation Center for Textile Science and Technology State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China National Garment and Accessories Quality Supervision Testing Center(Fujian) Fujian Provincial Key Laboratory of Textiles Inspection TechnologyFujian Fiber Inspection CenterFuzhou 350026China Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China

We employed the extended self-consistent field theory to investigate the supramolecular self-assembly behaviors of asymmetric diblock copolymer blends(AB/B’C)with hydrogen bonding interactions between shorter B and B’*** hydrogen bonding interactions are described by Yukawa potentials,where the hydrogen bonding donors and acceptors were modelled as two blocks smeared with opposite screened *** hierarchical microstructures with parallelly packed lamellae-in-lamellae(Lam)and 4.8.8 Archimedean tilting pattern(4.8.8)were observed at lower and higher hydrogen bonding density(θ),*** hierarchy of Lam and 4.8.8 were demonstrated by the one-and two-dimensional density profiles and the underlying order of the large-length-scale and small-length-scale microstructures were also *** was found that the 4.8.8 is favorable to the stronger hydrogen bonding density or ***θincreases,the microphase transition from Lam to 4.8.8 occurs atθ=0.34,which is mainly attributed to the optimization of the electrostatic energy and conformational entropy with sacrificing the interfacial *** work can provide a new strategy to understand the supramolecular self-assembly as well as the mechanism behind the formation of complex hierarchical microstructures.

关键词： Supramolecular self-assembly Hydrogen bond Block copolymer Self-consistent field theory Hierarchical microstructure

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Novel thermoplastic elastomeric gels as high performance actuators with no mechanical pre-strain

Novel thermoplastic elastomeric gels as high performance act...

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Electroactive polymer Actuators and Devices (EAPAD) 2009

作者： Vargantwar, Pruthesh H. Ghosh, Tushar K. Spontak, Richard J. Departments of Chemical and Biomolecular Engineering Raleigh NC 27695 United States Materials Science and Engineering Raleigh NC 27695 United States Fiber and Polymer Science Program North Carolina State University Raleigh NC 27695 United States

ISBN: (纸本)9780819475473

Nanostructured organic materials derived from block copolymers solvated by block-selective solvents have shown considerable potential as versatile dielectric elastomers. These materials can easily be tuned to achieve the mechanical and electrical properties required for actuator applications. They are lightweight and attractive due to their facile processing, robust properties and reliable performance. Their superb actuation behavior is realized when they are used as dielectric materials under actuation conditions promoting Maxwell compression, which produces large mechanical displacements, coupling efficiencies, and energy densities. These properties generally improve when the material is subjected to mechanical pre-strain. In most cases, mechanical pre-strain is needed to safely achieve application of a desired electrical field. Requisite pre-strain generally necessitates additional overhead in terms of weight and space for the device, and promotes changes in mechanical properties. In this study a new electroactive nanostructured polymer (ENP) is prepared from a triblock copolymer and a nonvolatile block-selective solvent, and evaluated as an actuator candidate. The copolymer exhibits reasonably high actuation strains (up to 70 area%) at relatively low electric fields and energy densities up to 50 kJ/m3 without pre-strain. These performance metrics exceed those reported for conventional dielectric materials such as the VHB acrylic elastomer, as well as those of ENPs derived from styrenic triblock copolymers under no pre-strain. © 2009 SPIE.

关键词： Block copolymers

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A study on preparation and mechanical properties of UHMWPE/nylon composite covered yarn

A study on preparation and mechanical properties of UHMWPE/n...

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2nd International Conference on Smart Materials and Nanotechnology in engineering

作者： Yao, Wei-Hua Yeh, Jen-Taut Chou, Wen-Li Shu, Yao-Chi Department of Material and Fiber Oriental Institute of Technology Taipei Taiwan Faculty of Chemistry and Material Science Hubei University Wuhan China Graduate School of Polymer Engineering National Taiwan University of Science and Technology Taipei Taiwan Department of Textile Engineering Nanya Institute of Technology Jungli Taiwan Department of Polymer Material Vanung University Jungli Taiwan

ISBN: (纸本)9780819478047

The study is describing Nylon yarn, though with low weight (specific weight 1.14), good elongation and high strength (4.59.5 g/d). Through the combination of irregular section long staple fiber to reach the core yarn, spun from Nylon fiber and long filament fiber, not only has the advantages of Nylon product but also has it can be used for making army-bag which can enhance the abrasion resistance, low weight and coving yarn that has doubled yarn effect from yarn surface consisting of Nylon fiber and long filament fiber. We used a Hamel's Elasto Twister (hollow-spindle machine) to prepare the yarn samples for our study. During spinning, the spindle speed was kept the same, while yarn through put speed was varied to obtain different wrap twists (700, 800, 900, 1000 T/M). The wrapping yarn is Nylon yarn with different count (40, 70D) and core yarn is ultra-high molecular weight polyethylene (UHMWPE) filament with 375 deniers, respectively. The results revealed the covered yarn have good physical properties and will be good performance in army-bag and army uniform. Keywords: Nylon, abrasion resistance, UHMWPE, physical properties © 2009 Copyright SPIE - The International Society for Optical engineering.

关键词： Yarn

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