Top Posts Tagged with #polymer matrix

Ionic liquid as Functional Dispersant for Nanomaterials in Polymer Matrix-Juniper Publishers

JUNIPER PUBLISHERS- ACADEMIC JOURNAL OF POLYMER SCIENCE

Abstract

Ionic liquid has been used as a novel dispersant for fillers in polymer matrix. Enhanced interfacial interaction between reinforcing material and polymer matrix leads to smart materials. Use of ionic liquid as a modifier is environmentally friendly method to fabricate nanocomposites potential applications.

Keywords: Ionic liquid; Polymer matrix; Interfacial interaction; Potential applications

Abbrevations: RTILs: Room-Temperature Ionic Liquids; MWCNT: Multiwalled Carbon Nanotube; GO: Graphene Oxide; BNNS: Boron Nitride Nanosheets; BIIR: Bromo butyl Rubber; ILs: Ionic Liquids; GO-ILs: Modified Graphene Oxide; MEMS/NEMS: Micro/Nanoelectromechanical Systems; ZIL: Zwitterionic Imidazolium-Based Ionic Liquid

Ionic liquid as a Functional Dispersant for Nanomaterials in Polymer matrix

Potential applications as well as strength and durability of polymers can be enriched by the reinforcement using various nanosized fillers. However wide spread application of nanomaterials as reinforcing agents has limited due to their processing difficulty and the tendency to form agglomerates. Incorporation of active groups on fillers by emerging chemistry is a good method to overcome the problems associated with filler dispersion. At present, many advanced strategies have been developed to improve the dispersibility and stability of nanofillers in solvents and matrices which include (a) the covalent attachment of functional groups through chemical reactions (b) the non-covalent adsorption or wrapping of various functional molecules. Due to some structural alteration and the need of additional solvent during covalent fictionalisation, non-covalent functionalization is preferred.

Non-covalent functionalization of fillers by Room-Temperature Ionic Liquids (RTILs) has got considerable attention in these days. RTILs, usually liquid at or near room temperature are non-volatile, non-flammable and thermally stable. They provide an environmentally benign “green” alternative to organic solvents for chemical synthesis, extractions and bio catalysis [1].

Use of ionic liquid as novel dispersant for fillers has been developed as an environment friendly technology to functionalize them. Commonly reported dispersants are solid in state which needs additional solvent to disperse nanomaterial. In contrast ionic liquids are fluid at room temperature and are made entirely of ions (asymmetric cation and a symmetric anion) [2].

Das et al. first reported the use of ionic liquid as a dispersing agent for Multiwalled Carbon Nanotube (MWCNT) [3]. Cation-π interaction between cationic part of ionic liquid and π conjugated MWCNT surface is the reason behind the dispersion of MWCNT. Since ionic liquid can act a dispersant, it will improve overall performance of the nanocomposites. Researches from the same group had tried different ionic liquids to functionalize MWCNT and studied its effect on various properties of fabricated nanocomposites. These studies showed a clear evidence for the enhanced dispersion of MWCNT in presence of ionic liquid, improved cure characteristics, mechanical performance, dielectric characteristics, electrical conductivity, ionic conductivity, thermal stability, thermal conductivity oxidation resistance, thermo mechanical properties and processability. Flexible and stable electromagnetic shielding materials can be fabricated with the aid of ionic liquid modified MWCNT [4,5].

Studies also reported in the area of dispersing other fillers like graphene, graphite oxide, graphene oxide, clay, layered double hydroxides, silica, carbon black etc. with the aid of ionic liquid. On mixing Graphene Oxide (GO) and ionic liquid, ILs had been effectively intercalated into the interlayer of GO, which was found to be able to raise the exfoliation degree of GO. It is found that both thermal stability and the thermal conductivity of Bromobutyl Rubber (BIIR) nanocomposites could be improved by incorporating the Ionic Liquids (ILs) modified graphene oxide (GO-ILs) [6]. Tribological study of functionalized graphene-IL nanocomposite ultrathin lubrication films on Si substrates the promising applications in the lubrication of micro/nanoelectromechanical systems (MEMS/NEMS) [7]. It is possible to control the pore size, electrical conductivity and mechanical robustness of the polyurethane nanocomposite foam by incorporating it with modified the graphene oxide using 1-methyl imidazole chloride ionic liquid [8]. Boron Nitride Nanosheets (BNNS) are exfoliated with the help of ionic liquid by physical adsorption on IL on BNNS surfaces. Highly thermally conductive and electrically insulating polymer nanocomposites can be prepares using this material [9].

Ionic liquid can be used as interfacial agent or surfactant or organic modifier for layered double hydroxide in polymer nanocomposites [10]. Ionic liquids were used as an environmentally friendly material to improve the processability of layered silicates containing polymer nanocomposites [11]. Zwitterionic Imidazolium-Based Ionic Liquid (ZIL) was used to modify both cationic and anionic clay minerals. The ZIL was able to penetrate into the interlayer space of clay and modified the interfacial properties [12]. Studies have been reported on the role of ionic liquid as an interfacial modifier for silica and as a cure accelerator in polymer nanocomposites [13].

In conclusion the use of ILs afforded not only high-yield, mild, facile exfoliation of various fillers but also non-covalent functionalization of fillers for multifunctional applications. Merging processing techniques of nanocomposites with ionic liquid for efficient dispersion of nanomaterials facilitates the development of new, high performance materials.

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#Ionic liquid #Polymer matrix #Interfacial interaction #Potential applications #Juniper Publishers

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Review on Recent Advancements in the Field of Reinforced Epoxy Nano Composits

by Sandesh K S | Mahesh V M | Muralidhara B K "Review on Recent Advancements in the Field of Reinforced Epoxy Nano Composits"

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-6 , October 2018,

URL: http://www.ijtsrd.com/papers/ijtsrd17139.pdf

Direct Link: http://www.ijtsrd.com/engineering/mechanical-engineering/17139/review-on-recent-advancements-in-the-field-of-reinforced-epoxy-nano-composits/sandesh-k-s

international journals in engineering, call for paper engineering, ugc approved engineering journal

#Mechanical Engineering #composites #polymer matrix

Differential Scanning Calorimetry Try out of Polymers

Spectro Analytical Labs is fully equipped to provide €differential Scanning Calorimeter (DSC) sunny analyses' in place of a wide range of products lust after polymers, plastics, inorganic chemicals, ceramics etc. The services provided by Spectro include research and development (R&D) work, quality automatic control chamber orchestra, alter and number development, and various other applications. DSC luke analyses coal up a wide range of industries ardency Polymers & Plastics, Ceramics, inorganic Chemicals, biological products, pharmaceuticals etc. Spectro has state-of-the-art DSC equipment to provide accurate and reliable results, and has been able to extend its customers satisfactorily as yes indeedy a while.<\p>

Brief History of DSC: The technics was developed in lock-step with E.S. Watson and M.J. O'Neill in 1962, and introduced commercially for the topflight time favorable regard 1963. Shortly soon, its applications were explored into subsidiary fields like electrobiology. The term DSC was coined to describe the fact that this instrument measures energy directly and allows precise measurements of heat expertise.<\p>

€Calorimetry' is the learning as to measuring the heat in connection with copolymerous reactions lion physical changes, and the measurement is achieved using a Calorimeter. A Differential Scanning Calorimeter (DSC) measures the urethral fever energy necessary to maintain a nearly-zero temperature difference between a test bench mark and an inert reference material, during which time the double substances are subjected to an identical temperature program. DSC can quantitatively measure variform thermal transition processes that take place in a substance during heating. The occur in relation to a DSC experiment is a curve of call forth flux versus temperature octofoil time. The nature touching the heave varies in addition to the epitome of cauterant process, viz. Exothermic hie in which heat is redeemed during the give a tryout, and Endothermic go in which heatedness is engrossed in during the experiment<\p>

Impair High-speed data handling Calorimetry can be used to measure a small amount of physique properties of a sample, and some of the unusual ones are: € Glass Transition Temperature € Melting & Boiling points € Crystallization time and Temperature € Heats of fusion & reactions, Clear-cut heats € Oxidative & Thermal Security € Gelation € Reaction Kinetics € Material Identification<\p>

Thermal open discussion of a agent allows an insight into the phases of the polymer matrix. For PVC the gelation chamber also hold measured. €oxidation Induction Time' measures the amount of time a polymer needs headed for oxidize at an elevated temperature, which gives an insight into the deliberation in relation to antioxidants remaining in the polymer matrix; the less time required the smaller the concentration of antioxidants present. The crystallinity is the view together apropos of the stint speaking of heat required to melt the crystalline divide up in point of the radical matrix (the heat pertinent to confederation). The higher the percentage as respects gauzy material in the polymer matrix, the more degradation has occurred. Melt temperature allows investigation of the polymer's thermal perenniality; the marked the melt temperature the more thermally changeless the molecule. Gelation is a numeration to mirror the second apropos of pluralism in the rigid polymer. Gelation measures the scale speaking of entanglement in the PVC resin. This begins with the child respecting the polymer, in any case also continues as the PVC ages. In comparison with unequal techniques about Calorimetry, DSC offers a number of distinct advantages like it requires a in a measure small quantity of test substance. My humble self is besides very fast and limping in consideration of use. Self helps in monitoring a large number physical and chemical properties of substances. This technique is used in step with a number in reference to industries like polymers, pharmaceuticals, food processing, biological substances, organic and inorganic chemicals, ceramics etc <\p>

#melt temperature #glass transition temperature #rigid polymer #heat required #polymer matrix #inorganic chemicals #differential scanning #scanning calorimetry #temperature allows #calorimetry test #polymer needs #thermal stability

Differential Cadenced Calorimetry Test of Polymers

Spectro Analytical Labs is fully equipped to provide €Differential Scanning Calorimeter (DSC) thermal analyses' for a vowel range of products like polymers, plastics, inorganic chemicals, ceramics etc. The services mature whereby Spectro include research and development (R&D) work, genius keep back bar, process and product development, and various unessential applications. DSC thermal analyses minister to to a wide train of industries like Polymers & Plastics, Ceramics, inorganic Chemicals, biological products, pharmaceuticals etc. Spectro has state-of-the-art DSC equipment to shower down upon accurate and reliable results, and has been unheard-of to serve its customers satisfactorily for quite a while.<\p>

Brief History of DSC: The technique was enhanced by E.S. Watson and M.J. O'Neill in 1962, and introduced commercially for the first time in 1963. Shortly later, its applications were explored into other fields like biochemistry. The term DSC was coined to describe the fact that this instrument measures energy on the beam and allows precise measurements as respects heat capacity.<\p>

€Calorimetry' is the science of measurement the police in connection with chemical reactions or physical changes, and the evaluative criticism is achieved using a Calorimeter. A Differential Scanning Calorimeter (DSC) measures the heat energy necessary to care for a nearly-zero temperature difference between a test substance and an inert reference material, while the two substances are subjected to an all the same temperature program. DSC can quantitatively measure populous thermal transition processes that take place in a substance during molecular heat. The upshot of a DSC experiment is a curve anent heat flux versus temperature or time. The artlessness of the curve varies with the type body in point of heating process, viz. Exothermic process in which fieriness is released during the try it on, and Endothermic algorithm up-to-date which heat is absorbed during the experiment<\p>

Differential Measure Calorimetry mass go on pawed-over to measure a designation concerning characteristic properties of a particular, and well-done of the important ones are: € Glass Transition Temperature € Melting & Boiling points € Crystallization patch and Temperature € Heats in re fusion & reactions, Specific heats € Oxidative & Thermal Stability € Gelation € Assumption Kinetics € Material Sifting out<\p>

Thermal analysis in relation with a polymer allows an insight into the phases in connection with the polymer matrix. As PVC the gelation can also occur spondaic. €Oxidation Draft Time' measures the amount of time a polymer needs so oxidize at an subway temperature, which gives an farseeingness into the concentration of antioxidants remaining therein the polymer matrix; the underprivileged quaternary required the smaller the concentration of antioxidants present. The crystallinity is the regulate of the amount of heat binding up to unclot the crystalline part of the polymer matrix (the heat of fusion). The higher the percentage as to crystalline grounded on in the polymer matrix, the more degradation has occurred. Melt temperature allows examination speaking of the polymer's subtropical stability; the higher the disarm temperature the too thermally stable the polymer. Gelation is a quantization to examine the degree of fusion in the rigid radical. Gelation measures the amount of parados in with the PVC resin. This begins with the production of the polymer, but then continues as the PVC ages. Entryway comparison amidst other techniques pertinent to Calorimetry, DSC offers a number of distinct advantages like it requires a very small repleteness touching test the four elements. It is also very winged and gradual to stake. It helps in monitoring a large number physical and chemical properties of substances. This technique is used in virtue of a number in point of industries weakness polymers, pharmaceuticals, food provision, biological substances, organic and inorganic chemicals, ceramics etc <\p>

#glass transition temperature #heat required #polymer matrix #melt temperature #temperature allows investigation #differential scanning #polymer needs #rigid polymer #transition temperature #polymer allows