• Title/Summary/Keyword: Nano polymer composite

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Preparation, Characterizations and Conductivity of Composite Polymer Electrolytes Based on PEO-LiClO4 and Nano ZnO Filler

  • ElBellihi, Abdelhameed Ahmed;Bayoumy, Wafaa Abdallah;Masoud, Emad Mohamed;Mousa, Mahmoud Ahmed
    • Bulletin of the Korean Chemical Society
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    • v.33 no.9
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    • pp.2949-2954
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    • 2012
  • Nano ZnO with an average size of 8 nm was prepared by thermal decomposition of zinc oxalate at $450^{\circ}C$. A series of based composite polymer electrolyte PEO-$LiClO_4$ and nano ZnO as a filler have been synthesized using solution cast technique, with varying the filler ratio systematically. XRD, DSC and FTIR studies have been conducted to investigate the structure and interaction of different groups in the composite polymer electrolyte. Effect of nano ZnO ceramic filler concentration on the structure of composites and their electrical properties (DC-conductivity, AC-conductivity, dielectric constant, dielectric loss and impedance) at different frequencies and temperatures was studied. Melting temperature ($T_m$) of PEO decreased with the addition of both $LiClO_4$ salt and nano ZnO filler due to increasing the amorphous state of polymer. All composite samples showed an ionic conductivity. The maximum room temperature ionic conductivity is found for $(ZnO)_{0.5}(PEO)_{12}(LiClO_4)$ composite sample. All the results are correlated and discussed.

Development and Characterization of Asymmetric Swelling-Induced Wrinkles on Natural Rubber Surface

  • Lee, Gi-Bbeum;Sathi, Shibulal Gopi;Kim, Min Jung;Park, Changsin;Huh, Yang Il;Nah, Changwoon
    • Elastomers and Composites
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    • v.51 no.4
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    • pp.342-349
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    • 2016
  • Characteristics of the swelling-induced wrinkles on the surfaces of natural rubber (NR) film were investigated. The wrinkle structure was generated by swelling of NR film pre-stretched and firmly bonded onto an aluminum substrate in hexane. A novel experimental method was adopted to replicate the swelling-induced wrinkles on the NR film using an epoxy-hardener system. To get insight into the wrinkle parameters; the wrinkle length (L), wrinkle distance (D), wrinkle height (H) and the angle between two consecutive wrinkles (${\theta}$), the cross-sections of the replicas obtained from saturated swollen NR film were examined using an optical microscopy (OM). From the OM images, the wrinkling parameters were measured as a function of the thickness of NR film from 0.42 to 1.76 mm. Also, it was evaluated that the effects of swelling time on the wrinkling parameters. The length (L), distance (D) and height (H) of wrinkles increased as the thickness of the NR film and the swelling time increased. However, the angle between the wrinkles (${\theta}$) showed a sharp decrease up to a swelling time of 200 minutes and slightly decreased afterwards.

Titanium Dioxide Nanoparticles filled Sulfonated Poly(ether ether ketone) Proton Conducting Nanocomposites Membranes for Fuel Cell

  • Kalappa, Prashantha;Hong, Chang-Eui;Kim, Sung-Kwan;Lee, Joong-Hee
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2005.11a
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    • pp.87-90
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    • 2005
  • This paper presents an evaluation of the effect of titanium dioxide nanoparticles in sulfonated poly(ether ether ketone) (SPEEK) with sulfonation degree of 57%. A series of inorganic-organic hybrid membranes were prepared with a systematic variation of titanium dioxide nanoparticles content. Their water uptake, methanol permeability and proton conductivity as a function of temperature were investigated. The results obtained show that the inorganic oxide network decreases the proton conductivity and water swelling. It is also found that increase in inorganic oxide content leads to decrease of methanol permeability. In terms of morphology, membranes are homogeneous and exhibit a good adhesion between inorganic domains and the polymer matrix. The properties of the composite membranes are compared with standard nafion membrane.

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Performance Test of Nano-Composite Actuator Based on Fullerene Mixed Nafion (풀러렌이 혼입된 나피온기반 나노복합체 작동기의 성능평가)

  • Jung, Jung-Hwan;Lee, Il-Kwon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.11a
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    • pp.374-375
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    • 2008
  • In this study, the nano-composite actuator based on Fullerene and Nafion was newly developed to improve the electro active polymer actuators. The tensile test was employed to define the mechanical stiffness and strength of the nano-composite membrane. Also, the bending displacement of the Fullerene-Nafion based nano-composite actuator was investigated under DC and AC excitations with various magnitudes and frequencies. As a result, the new nano-composite actuator based on Fullerene-Nafion shows much larger deformation than the pure Nafion based actuator and solves the straightening back Problem of the previous electro active polymer actuators.

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Flexible Liquid Crystal Displays Using Liquid Crystal-polymer Composite Film and Colorless Polyimide Substrate

  • Kim, Tae Hyung;Kim, Minsu;Manda, Ramesh;Lim, Young Jin;Cho, Kyeong Jun;Hee, Han;Kang, Jae-Wook;Lee, Gi-Dong;Lee, Seung Hee
    • Current Optics and Photonics
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    • v.3 no.1
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    • pp.66-71
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    • 2019
  • Application of liquid crystal (LC) materials to a flexible device is challenging because the bending of LC displays easily causes change in thickness of the LC layer and orientation of LCs, resulting in deterioration in a displayed image quality. In this work, we demonstrate a prototype device combining a flexible polymer substrate and an optically isotropic LC-polymer composite in which the device consists of interdigitated in-plane switching electrodes deposited on a flexible colorless polyimide substrate and the composite consisting of nano-sized LC droplets in a polymer matrix. The device can keep good electro-optic characteristics even when it is in a bending state because the LC orientation is not disturbed in both voltage-off and -on states. The proposed device shows a high potential to be applicable for future flexible LC devices.

Gold functionalized-graphene oxide-reinforced acrylonitrile butadiene rubber nanocomposites for piezoresistive and piezoelectric applications

  • Mensah, Bismark;Kumar, Dinesh;Lee, Gi-Bbeum;Won, Joohye;Gupta, Kailash Chandra;Nah, Changwoon
    • Carbon letters
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    • v.25
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    • pp.1-13
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    • 2018
  • Gold functionalized graphene oxide (GOAu) nanoparticles were reinforced in acrylonitrile-butadiene rubbers (NBR) via solution and melt mixing methods. The synthesized NBR-GOAu nanocomposites have shown significant improvements in their rate of curing, mechanical strength, thermal stability and electrical properties. The homogeneous dispersion of GOAu nanoparticles in NBR has been considered responsible for the enhanced thermal conductivity, thermal stability, and mechanical properties of NBR nanocomposites. In addition, the NBR-GOAu nanocomposites were able to show a decreasing trend in their dielectric constant (${\varepsilon}^{\prime}$) and electrical resistance on straining within a range of 10-70%. The decreasing trend in ${\varepsilon}^{\prime}$ is attributed to the decrease in electrode and interfacial polarization on straining the nanocomposites. The decreasing trend in electrical resistance in the nanocomposites is likely due to the attachment of Au nanoparticles to the surface of GO sheets which act as electrical interconnects. The Au nanoparticles have been proposed to function as ball rollers in-between GO nanosheets to improve their sliding on each other and to improve contacts with neighboring GO nanosheets, especially on straining the nanocomposites. The NBR-GOAu nanocomposites have exhibited piezoelectric gauge factor (${GF_{\varepsilon}}^{\prime}$) of ~0.5, and piezo-resistive gauge factor ($GF_R$) of ~0.9 which clearly indicated that GOAu reinforced NBR nanocomposites are potentially useful in fabrication of structural, high temperature responsive, and stretchable strain-sensitive sensors.

Nano-Kenaf Cellulose Effects on Improved Mechanical Properties of Polypropylene Composite (나노 케냐프 셀룰로오스가 폴리프로필렌 복합소재의 물성 증가에 미치는 영향)

  • Oh, Jeong Seok;Lee, Seong-Hoon;Bumm, Sughun;Kim, Kwang-Jea
    • Polymer(Korea)
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    • v.37 no.5
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    • pp.613-617
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    • 2013
  • The effects of nano size kenaf cellulose fiber on mechanical property of polypropylene (PP) composite were investigated. The addition of nano-kenaf in place of natural kenaf showed higher tensile strength, flexural strength, impact strength, and heat deflection temperature compared to the natural kenaf filled PP composite, while it shows lower melt flow index, elongation%, and flexural modulus. These seemed to be due to the increased surface area of nano-kenaf fiber contacting PP matrix and reduced impurities such as volatile extractives on the fiber surface.

An exact solution for mechanical behavior of BFRP Nano-thin films embedded in NEMS

  • Altabey, Wael A.
    • Advances in nano research
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    • v.5 no.4
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    • pp.337-357
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    • 2017
  • Knowledge of thin films mechanical properties is strongly associated to the reliability and the performances of Nano Electro Mechanical Systems (NEMS). In the literature, there are several methods for micro materials characterization. Bulge test is an established nondestructive technique for studying the mechanical properties of thin films. This study improve the performances of NEMS by investigating the mechanical behavior of Nano rectangular thin film (NRTF) made of new material embedded in Nano Electro Mechanical Systems (NEMS) by developing the bulge test technique. The NRTF built from adhesively-bonded layers of basalt fiber reinforced polymer (BFRP) laminate composite materials in Nano size at room temperature and were used for plane-strain bulging. The NRTF is first pre-stressed to ensure that is no initial deflection before applied the loads on NRTF and then clamped between two plates. A differential pressure is applying to a deformation of the laminated composite NRTF. This makes the plane-strain bulge test idea for studying the mechanical behavior of laminated composite NRTF in both the elastic and plastic regimes. An exact solution of governing equations for symmetric cross-ply BFRP laminated composite NRTF was established with taking in-to account the effect of the residual strength from pre-stressed loading. The stress-strain relationship of the BFRP laminated composite NRTF was determined by hydraulic bulging test. The NRTF thickness gradation in different points of hemisphere formed in bulge test was analysed.

An Experimental Study on Durability Evaluation of Nano Composite Hybrid Polymer Type Coatings Applied Concrete (알콕시 실란계 나노합성 Hybrid 폴리머형 코팅제를 적용한 콘크리트의 내구성능 평가에 관한 실험적 연구)

  • 박홍욱;송하원;백종명;우종태;남진원
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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    • pp.687-692
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    • 2003
  • In this study, durability of concrete whose surface were treated by nano-composite hybrid polymer type coatings, which can provide a barrier against the ingress of moisture or aggressive ions to concrete, is discussed. For the durability evaluation of the coated concrete, chloride ponding test, accelerating carbonation test, porosity measurement test, and the SEM test are conducted. As the result of this study, it is found that nano-composite hybrid polymer type coated concrete has a much higher resistance to the ingress of chloride ion, carbon dioxide, moisture and aggressive acid than plain concrete has.

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Aeroelastic behavior of nano-composite beam-plates with double delaminations

  • Mousavi, S.B.;Yazdi, Ali A.
    • Steel and Composite Structures
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    • v.33 no.5
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    • pp.653-661
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    • 2019
  • In this paper aeroelastic behavior of 3-phase nano-composite beam-plate with double delaminations is investigated. It is tried to study the effect of carbon nano-tubes (CNTs) on critical flutter pressure of reinforced damaged nano-composite structures. In this case, the CNTs are appending to the polymer matrix uniformly. The Eshelby-Mori-Tanaka model is used to obtain the effective material properties of 3-phase nano-composite beam-plate. To investigate the aeroelastic behavior of delaminated beam-plate subjected to supersonic flow, it is assumed that the damaged segments are forced to vibrate together. The boundary conditions and auxiliary conditions at edges of delaminated segments are used to predict critical flutter pressure. The influence of CNTs and different delamination parameters such as delamination length, axial position and its position through thickness are investigated on critical flutter pressure.