Effect of Ionic Species on the Structures and Properties of Salt‐Containing PEO/Montmorillonite Nanocomposites

Stefanescu, Eduard A.; Ştefănescu, Cristina; Daly, William H.

doi:10.1002/macp.200800371

Cited by 13 publications

(11 citation statements)

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“…Nanocomposites of poly(ethylene oxide) with montmorillonite have been extensively studied in the past decade [ 5 , 191 , 192 , 193 , 194 ]. It has been recently shown that the ionic strength in PEO-MMT nanocomposite gels, dictated by addition of various Li + and Na + salts, affects the extent of internal orientation of such systems when subjected to elongational flow [ 194 ].…”

Section: Polymer/clay Nanocompositesmentioning

confidence: 99%

Insight into the Broad Field of Polymer Nanocomposites: From Carbon Nanotubes to Clay Nanoplatelets, via Metal Nanoparticles

2009

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Highly ordered polymer nanocomposites are complex materials that display a rich morphological behavior owing to variations in composition, structure, and properties on a nanometer length scale. Metal-polymer nanocomposite materials are becoming more popular for applications requiring low cost, high metal surface areas. Catalytic systems seem to be the most prevalent application for a wide range of metals used in polymer nanocomposites, particularly for metals like Pt, Ni, Co, and Au, with known catalytic activities. On the other hand, among the most frequently utilized techniques to prepare polymer/CNT and/or polymer/clay nanocomposites are approaches like melt mixing, solution casting, electrospinning and solid-state shear pulverization. Additionally, some of the current and potential applications of polymer/CNT and/or polymer/clay nanocomposites include photovoltaic devices, optical switches, electromagnetic interference (EMI) shielding, aerospace and automotive materials, packaging, adhesives and coatings. This extensive review covers a broad range of articles, typically from high impact-factor journals, on most of the polymer-nanocomposites known to date: polymer/carbon nanotubes, polymer/metal nanospheres, and polymer/clay nanoplatelets composites. The various types of nanocomposites are described form the preparation stages to performance and applications. Comparisons of the various types of nanocomposites are conducted and conclusions are formulated.

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Section: Polymer/clay Nanocompositesmentioning

confidence: 99%

Insight into the Broad Field of Polymer Nanocomposites: From Carbon Nanotubes to Clay Nanoplatelets, via Metal Nanoparticles

2009

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“…Contrary to what can be observed in this work, it has been shown in the past that in many aqueous systems clay nanoplatelets orient with the surface parallel to the plane of the film and stack on top of each other forming a layered structure 18. For example, it has been proven that in poly(ethylene oxide) (PEO)/MMT nanocomposite films, prepared via a LBL approach from aqueous dispersions, the clay platelets predominantly orient with the surface parallel to the plane of the film leading to observation of anisotropy in SAXS and SEM experiments 18, 44, 45. Clearly, such a predominant platelet orientation is not detected for the PIB/MMT film discussed here.…”

Section: Resultsmentioning

confidence: 99%

Flexible Polymer/Clay Nanocomposite Films as Oxygen Supply Materials

Stefanescu

Ştefănescu

2011

Macro Materials & Eng

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PIB/MMT nanocomposite films containing UHP are fabricated and characterized for potential applications in wounded-skin oxygen delivery and/or tooth cleaning. The UHP acts as a source of oxygen, whereas MMT creates a pathway for water molecules penetrating the film in order to generate a controlled release of H 2 O 2 molecules. Most UHP particles are uniformly dispersed throughout the entire thickness of the films. DMA measurements indicate that the material retains most of its structural characteristics when exposed to water. SEM measurements show that no interface exists between individually spread multilayers. SAXS measurements indicate that the clay platelets are predominantly exfoliated and randomly oriented within the film. Controlled release of H 2 O 2 is found over a period of %90-100 min.

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“…Основні дослідження в цьому аспекті протягом останнього часу були спрямовані на удосконалення методів синтезу і характеристику фізичних власти-востей полімерних нанокомпозитів [7,8,11,13]. Вуг-лецеві нанотрубки (ВНТ) становлять значний інтерес для багатьох технологій [3].…”

Section: аналіз останніх публікацій і дослідженьunclassified

Analysis of thermophysical properties of polymer nanocomposites based on polypropylene

Dinzhos¹,

Fialko²,

Рехтета³

et al. 2015

Collection of Scientific Publications NUS

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Abstract. Polymer nanocomposites (PNC) as a new class of materials is the object of intensive research during the last decade. The growth of interest in the study of these systems is explained by their better mechanical durability and higher thermal stability in comparison with the unfilled polymers. The improvement of the characteristics of the polymer takes place already at the insertion of a small amount of filler (~ 1 -5 %) in it. The main advantages of these materials are light weight, corrosion resistance, ease of treatment, cheap filler etc. Nowadays, the majority of the heat power complex products are manufactured on the basis of polymer composite materials (PCM) which contain microparticles. The use of the nanofillers allows developing a PCM with the same set of functional characteristics that the PCM with micro particles has, but at the lower filler content. Polymer nanocomposites (PNC) are not only of practical interest, but also of a fundamental one, as nanofillers have a greater specific surface area which polymer chains interact. Therefore, the main studies in this direction have recently been focused on the improvement of synthesis methods and characterization of physical properties of polymer nanocomposites. Carbon nanotubes (CNT) are of considerable interest for many technologies. CNT have high elasticity, strength and stringiness, so that they can be used in a wide variety of nanocomposites, including the polymer ones. One of the most important factors of the effective improvement of the polymer properties is the insertion of carbon nanotubes which have large specific surface area, that promotes better adhesion with the polymer matrix, in comparison with conventional polymer composites. Polymer nanocomposites filled with carbon nanotubes can be easily made due to the small diameter of the filler. The use of carbon nanotubes as a filler provides wide possibilities for the development of new multifunctional materials with a wide range of applications in industry. Currently, there is no systematic information on the impact of carbon nanotubes on the processes of structure formation of polymer composites and thermal properties of polymer nanocomposites obtained on their basis. Considering the above mentioned, the study of the impact of carbon nanotubes on the structure and thermal properties of the composites on their basis is urgent. Keywords: polypropylene/carbon nanotube; nanocomposite; non-isothermal crystallization; crystallization enthalpy; crystallization temperature.Анотація. Представлено результати експериментальних і розрахункових досліджень кінетики неізотермічної кристалізації ізотактичного поліпропілену (ПП-0) і нанокомпозитів, які містять 0,5 (ПП-0,5); 1 (ПП-1); 2 (ПП-2); 5 (ПП-5); 10 (ПП-10); 20 (ПП-20) мас. % вуглецевих нанотрубок. Виконано аналіз термодинамічних параметрів залежно від процентного вмісту вуглецевих нанотрубок. Вивчено особливості впливу структури полімерних нанокомпозитів на їх теплофізичні властивості.

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Effect of Ionic Species on the Structures and Properties of Salt‐Containing PEO/Montmorillonite Nanocomposites

Cited by 13 publications

References 58 publications

Insight into the Broad Field of Polymer Nanocomposites: From Carbon Nanotubes to Clay Nanoplatelets, via Metal Nanoparticles

Insight into the Broad Field of Polymer Nanocomposites: From Carbon Nanotubes to Clay Nanoplatelets, via Metal Nanoparticles

Flexible Polymer/Clay Nanocomposite Films as Oxygen Supply Materials

Analysis of thermophysical properties of polymer nanocomposites based on polypropylene

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