دانلود کتاب خارجی - دانلود رایگان کتاب لاتین PDF علمی

تعداد نتایج: 1102

Polyurethane Polymers: Blends and Interpenetrating Polymer Networks

By Sabu Thomas, Janusz Datta, Jozef Haponiuk, Arunima Reghunadhan
Publisher: Elsevier, 2017-08-15
Pages: 442
Language: en
ISBN_13:9780128040850
ISBN_10:0128040858
Subject: Technology & Engineering

Biopolymers and Nanocomposites for Biomedical and Pharmaceutical Applications

جزئیات و درخواست

By Eram Sharmin, Fahmina Zafar
2017
Language: en
ISBN_10:1536106453
ISBN_13:9781536106459
Subject: Nanocomposites (Materials)

Emerging Nanodielectric Materials for Energy Storage

From Bench to Field

جزئیات و درخواست

By Srikanta Moharana, Duncan H. Gregory, Ram Naresh Mahaling
Publisher: Springer Nature, 2023-10-30
Pages: 442
Language: en
ISBN_13:9783031409387
ISBN_10:3031409388
Subject: Science

Polymer-Carbon Nanotube Composites

جزئیات و درخواست

By T McNally, P Pötschke
2011
Pages: 848
Language: en
OTHER:OCLC:1105765815
Subject: Engineering

By Jianxun Ding, Yang Li, Mingqiang Li
2019
Pages: 306
Language: en
ISBN_10:3039215914
ISBN_13:9783039215911
Subject: Chemistry

Sustainable Polylactide-Based Composites

جزئیات و درخواست

By Suprakas Sinha Ray, Ritima Banerjee
Publisher: Elsevier, 2023-01-15
Pages: 394
Language: en
ISBN_13:9780323996402
ISBN_10:032399640X
Subject: Science

Eco-friendly Polymer Nanocomposites

Chemistry and Applications

جزئیات و درخواست

By Vijay Kumar Thakur, Manju Kumari Thakur
Publisher: Springer, 2016-10-23
Language: en
ISBN_10:8132229703
ISBN_13:9788132229704
Subject: Technology & Engineering

Bio-templated Conducting Polymer Nanostructures for Sensitive Detection and Flexible Electronics

I. DNA-templated polyaniline nanowire array for fast detecti...

جزئیات و درخواست

By Yufeng Ma
2007
Pages: 402
Language: en
OTHER:OCLC:436970545
Subject: Polymers

Poly(vinyl Chloride)-based Blends, Interpenetrating Polymer Networks (IPNs), and Gels

جزئیات و درخواست

By Sabu Thomas, H. Akhina
Publisher: Elsevier, 2024-04
Pages: 644
Language: en
ISBN_13:9780323994743
ISBN_10:0323994741
Subject: Medical

Synthesis, Characterization and Cure Kinetics of Polyaniline Modified MMT Clay

$This research work focuses on the synthesis characterization and processing of conducting polymer coated both carbon fiber and montmorillonite clay based nano-particles to improve the mechanical, thermal, and adhesive properties of epoxy based micro and nano composites. The entire research work mainly consists of two parts. In the first part, homogeneous and uniform coatings of polyaniline were successfully deposited onto carbon fibers by aqueous electrodeposition technique using p-toluene sulfonic acid as the electrolyte. Electrochemical deposition of aniline was carried out by cyclic voltammetry in the potential range of -0.2 V to 1.0 V vs. SCE. The electrochemical deposition parameters such as the number of cycles, scan rate (SR), initial monomer ([M]) and electrolyte concentration ([E]) were systematically varied. The amount of composite coatings on carbon fibers was dependant on the electrochemical deposition parameters. From the weight gain analysis, rate of the reactions (Rp) were calculated. As the aniline concentration was increased up to 0.35 M and electrolyte concentration up to 0.5 M, the deposition rate also increased, whereas an increase in scan rate decreased the deposition rate. The kinetic analysis showed that the rate equation for the p-toluene sulfonic acid system is Rp [alpha] SR-1.25 [M]0.73 [E]0.95. IR spectra also show an increase in the deposition of polyaniline coatings on carbon fibers with a decrease in the scan rate and an increase in both monomer and electrolyte concentration. The ratio of two oxidation states of polyaniline namely emeraldine and pernigraniline obtained during electrodeposition can be varied by changing the electrochemical deposition parameters. SEM results show that carbon fiber surface was uniformly coated with polyaniline resulting a dense, rough and reactive surface that increases the compatibility and wettability of carbon fibers. The effect of PANi coated carbon fibers on the curing behavior of diglycidyl ether of bisphenol-A (DGEBA) epoxy prepolymer crosslinked with tri ethylene tetra amine (TETA) was analyzed by DSC. The tensile, flexural and impact tests of carbon fiber epoxy micro composites showed that PANi coated carbon fiber epoxy systems have higher modulus, toughness and mechanical strengths compared to unmodified carbon fiber epoxy composites. In the second part of the research work, conducting polyaniline (PANi) montmorillonite (MMT) clay nanocomposites were synthesized by using in-situ polymerization. The X-Ray diffraction patterns showed that polyaniline was intercalated between clay galleries in the order of nanoscale. From the SEM micrographs, it was revealed that, in-situ polymerization of aniline took place both in and out of the clay galleries. Polyaniline surface modified clay nanoparticles were then dispersed in diglycidyl ether of bisphenol-A (DGEBA) epoxy prepolymer using high shear mixing and ultrasonication. The viscosity measurements of modified and unmodified clay dispersed in epoxy prepolymer systems showed that PANi modified clay has lower viscosity than the pristine clay that provides easiness during processing. Infrared spectroscopy data proves that reactive secondary and tertiary amine groups on the fully dispersed polyaniline modified clay platelets react with epoxy resin resulting a strong chemical and physical interaction between nanoparticles and polymeric matrix. The effect of PANi surface modified nano particles on the curing reaction and kinetics of epoxy with tri-ethylene tetra amine (TETA) was analyzed by using DSC and explained by modified Avrami equation. The X-Ray diffraction pattern of fully cured 5% (w/w) PANi-MMT clay epoxy nanocomposites showed exfoliation behavior. Thermal analysis showed that for 5% (w/w) PANi-MMT filled epoxy nanocomposites has higher thermal stability than both fully cured pristine epoxy and 5% (w/w) clay epoxy nanocomposite. With the addition and exfoliation of 5% (w/w) PANi modified clay an increase of 8 °C in glass transition temperature was observed with respect to pristine epoxy. Thermal analysis also showed that polyaniline on the surface of nanoparticles improves crosslinking reaction by reducing the curing time and helping the reaction to occur at lower temperatures. Mechanical testing results for 5% (w/w) polyaniline clay epoxy nanocomposites showed 30 to 35% increase in the tensile strength compared to the pristine epoxy. This enhancement of the tensile strength is ascribed to the resistance exerted by the clay itself as well as the aspect ratio of the clay layers and the partial exfoliation and/or fully intercalation of clay galleries. The degree of intercalation of the clay platelets in the epoxy matrix is proportional to an increase in the flexural strengths. In-situ polymerization of aniline within the clay galleries causes a more homogeneous exfoliation of the clay in the epoxy matrix.$

جزئیات و درخواست

By Aydin Aykanat
2008
Pages: 159
Language: en
OTHER:OCLC:246653592

Advanced Polymeric Materials for Sustainability and Innovations

جزئیات و درخواست

By Sajith Thottathil, Sabu Thomas, Nandakumar Kalarikkal, Didier Rouxel
2018
Language: en
ISBN_10:1771886331
ISBN_13:9781771886338
Subject: Green chemistry

Indian Journal of Engineering and Materials Sciences

جزئیات و درخواست

2003
Pages: 550
Language: en
OTHER:UOM:39015058326946
Subject: Engineering

Journal of Nanoscience and Nanotechnology

جزئیات و درخواست

2006
Pages: 1088
Language: en
OTHER:UOM:39015058915151
Subject: Nanoscience

Natural Polymers–Based Green Adsorbents for Water Treatment

جزئیات و درخواست

By Susheel Kalia
Publisher: Elsevier, 2021-08-22
Pages: 358
Language: en
ISBN_13:9780128205426
ISBN_10:0128205423
Subject: Technology & Engineering

Conjugated Polymers for Next-Generation Applications, Volume 1

Synthesis, Properties and Optoelectrochemical Devices

جزئیات و درخواست

By Vijay Kumar, Kashma Sharma, Rakesh Sehgal, Susheel Kalia
Publisher: Elsevier, 2022-06-24
Pages: 616
Language: en
ISBN_13:9780128234426
ISBN_10:0128234423
Subject: Science

Intrinsically Conducting Polymers

An Emerging Technology

جزئیات و درخواست

By M. Aldissi
2014-01-15
Pages: 240
Language: en
ISBN_10:9401719535
ISBN_13:9789401719537

Rheology, Processing and Properties of Polymer Nanocomposites Based on POSS and Boehmite

جزئیات و درخواست

By Nabilah Adel Mohammed
2014
Language: en
ISBN_10:3798326819
ISBN_13:9783798326811

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