...A PAPER ON “SELF-HEALING POLYMER TECHNOLOGY” [pic] SUBMITTED BY: Sreeja Gadhiraju, Naga vaishnavi.A, III/IV Mech, Sri Sivani Institute Of Technology. sreeja.btech@gmail.com INDEX |Topic |Page No. | | | | |ABSTRACT |1 | |introduction |2 | |INTRINSIC SELF-HEALING |2-3 | |EXTRINSIC SELF-HEALING |4-5 | |HEALING MECHANISM | 5-7 | |APPLICATION |7-8 | |PROBLEM AND CHALLENGES |9 | |CONCLUSION ...
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...Highlight on My Research Background Overview : Polymeric Composite has emerged as a new technology for innovation of new materials with low cost, high durability, more effectiveness, moreover reduction of environmental pollution. Leather industry is one of the highly environmental pollution creating industry. Solid wastes are being generated from the tanneries 88 metric tons/day on an average basis in my country, Bangladesh. In my research work I have attempted to reuse, recycle the leather waste. Moreover the aim is to reduce the environmental pollution. My research work was conducted to make bioapplicable materials from polyester resin reinforced with scrap leather fiber. The resulting polymer composite has been named “Leather Plastic”. One of the most important objectives of my research work is to use natural leather fiber which is biodegradable. So a definite amount of polyester resin could be replaced by natural fiber, which is very important to our environment. Manufacturing process: The composite was prepared by Wet Layup method. Leather fiber was treated with Unsaturated Polyester Resin and then fabricated and characterized. The matrix was prepared by mixing Unsaturated Polyester Resin with Polyvinyl Alcohol (PVA) solution. The grinded leather fiber was used as the reinforcement. After mixing the matrix with the reinforcement, peroxide was used as a radical initiator to induce polymerizations. After curing period the mechanical properties of the composite was characterized...
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...two-stage emulsion polymerization method, a series of poly(methyl methacrylate-acrylonitrile)/poly(ethyl acrylate-n-butyl acrylate) [P(MMA-AN)/P(EAnBA)] latex interpenetrating polymer networks (LIPNs) were synthesized by varying AN content, ratio of network I/network II, crosslinker content, and introducing chain transfer agent. The damping properties of the LIPNs were investigated using a Rheovibron Viscoelastometer. The results indicates that a suitable content of AN can improve the damping properties of the LIPNs. Three kinds of fillers were incorporated into the LPINs, respectively, to measure the change in the damping properties. Mica and TiO2 both increased the damping properties of the LIPNs over the wide temperature range. For TiO2-filled LIPNs, it was observed that the tan values exceeded 0.4 over 112.6°C temperature range from 50 to 72.6°C. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 722–727, 2000 Key words: latex; interpenetrating polymer networks (IPNs); damping properties; P(MMA-AN)/P(EA-nBA), filling INTRODUCTION Research on damping polymer materials that are used for the control of sound and vibration damping has become more and more urgent with the development of modern industry. Based on the damping theory, the damping properties of polymers are dominated by their glass transition. Polymers form especially useful vibration damping materials near their glass transition temperature, Tg, as a result of the onset of coordinated chain molecular motion, maximizing...
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...Macromolecular Rapid Communications Communication Forming of Polymer Nanofibers by a Pressurised Gyration Process Suntharavathanan Mahalingam, Mohan Edirisinghe* A new route consisting of simultaneous centrifugal spinning and solution blowing to form polymer nanofibers is reported. The fiber diameter (60–1000 nm) is shown to be a function of polymer concentration, rotational speed, and working pressure of the processing system. The fiber length is dependent on the rotational speed. The process can deliver 6 kg of fiber per hour and therefore offers mass production capabilities compared with other established polymer nanofiber generation methods such as electrospinning, centrifugal spinning, and blowing. 60 Frequency (%) 50 40 30 20 10 0 0 50 100 150 200 250 300 350 400 Fibre diameter (nm) 1. Introduction Polymer nanofibers are a promising class of materials for various applications, including electronics, optical devices, batteries, and filtration.[1–9] Indeed, due to their high surface area to volume ratio, they are attractive in many biomedical applications such as scaffolds used in tissue engineering, drug release, artificial organs, wound healing and vascular grafts.[10,11] Due to the expanding demand for nanofibers across a wide range of industries, there needs to be an improvement in the current state-of-art technologies to mass produce them more consistently, reliably, robustly and cost effectively.[12] Electrospinning is a well-established technique...
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...Science and Engineering 2012 ABSTRACT Four tri-block copolymers composed of poly(L-lactide)-poly(caprolactone-co-L-lactide)-poly(L-Lactide) (PLLA-PCLLA-PLLA), with disrupted ends were characterised according to individual’s mechanical and thermal properties. The tri-block copolymers consist of amorphous PCLLA middle block, at constant composition of CL and LLA being 60% and 40% respectively. The end blocks consist of either a semi-crystalline PLLA or various compositions of P(LLA-DLLA). Factors such as high overall crystallinity and effective crosslinking of arms led to the high modulus values of polymers. A 16-week degradation study was done to investigate degradation behaviour. The number average molar mass, mass loss, water uptake and the changes in mechanical and thermal properties were investigated at each designated time points. Experiments revealed that the polymers degraded via bulk degradation. The 16-weeks period only showed the initial stage of degradation whereby...
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...At room temperature is a colorless gas with an odor similar to gasoline. It is an alkene used to manufacture rubber by addition polymerization. It has two C-C double bonds in its structure which allows the compound to form a wide variety of polymers including ABS. This compound is a toxic gas listed as a human carcinogen. Figure 2. Representation of 1.3-butadiene (mw: 54.09 g/mol) Styrene: A colorless to yellowish liquid that produce polystyrene by homopolymerization. Styrene is a derivative of benzene and could be found in small quantities in plants and foods. It is slightly soluble in water and very soluble in ethanol, acetone and carbon disulfide. Its rate of polymerization is low at room temperature but increases at higher temperatures. Figure 3....
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...and Dielectric thermal analysis (DETA) are the techniques used for studying the structure-properties relationships of the composites. The experimental results show that the matrices studied and their specific properties have a great impact O. A. Al-Hartomy : A. A. Al-Ghamdi Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia O. A. Al-Hartomy Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71491, Saudi Arabia F. Al-Solamy Department of Mathematics, Faculty of Science, University of Tabuk, Tabuk 71491, Saudi Arabia F. Al-Solamy Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia N. Dishovsky (*) : M. Mihaylov : M. Ivanov Department of Polymer Engineering, University of Chemical Technology and Metallurgy, 8 Kl. Ohridski Blvd., 1756, Sofia, Bulgaria e-mail: dishov@uctm.edu F. El-Tantawy Department of Physics, Faculty of Science, Suez Canal University, Ismailia, Egypt upon both the dynamic mechanical and dielectric parameters of...
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...How to make a crab shell see-through 30 November 2011 Researchers in Japan have made a crab shell transparent. Then, using knowledge gained from this activity, they created a transparent nanocomposite sheet, incorporating powdered chitin from crab shells. The nanocomposite could have applications in devices that need a high light transmittance, such as flat panel displays. Scientists have previously used cellulose from plants and chitin to strengthen materials, giving biologically-inspired nanocomposites. If natural nanofibres are dispersed widely enough in a transparent polymer matrix, they can strengthen the polymer and the resulting nanocomposite material will retain its transparency. Work on optically transparent polymers containing cellulose nanofibres shows they have a low axial thermal expansion coefficient, meaning their size does not vary with temperature, making them ideal for use in flexible flat panel displays and solar cells. Muhammad Iftekhar Shams and co-workers from Kyoto University took a whole crab and treated it with hydrochloric acid, sodium hydroxide and ethanol to remove the minerals, proteins, fats and pigments, respectively. This gave a chitin-only crab shell, which they immersed in an acrylic resin monomer. Following polymerisation, they obtained an entirely transparent crab shell. The shell retained its shape and detail, right down to the creature's eyes. Preparing the transparent crab shell: (a) original shell, (b) shell after removal of matrix...
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...POLYMER IMPORTER |1. |SABIC INDIA PVT LTD |5th Floor, The Capital Court Olof Palme Marg, |91 11 671 3121 / 22 / 23 / 24Fax:+91 11 671 3125 / 26 | | | |Munirka,New Delhi 110067, E-mail: | | | | |sipl@sabicindia.com | | |2. |BROUGE INDIA PVT LTD |301, VIP Plaza Off New Link Road Andheri (W) |Tel: +91 22 4255 7700 Fax: +91 22 4255 7710 | | | |Mumbai- 400 053 |email:info@borouge.com | |3. |INDORAMA INDUSTRIES LIMITED |indorama Industries Limited |91 172 274 0252 | | | |Tower-F. 3rd Floor; DLF IT Park |Fax: +91 172 500 9342 | | | |Chandigarh- 160 101 (UT). |Email: info@indorama.in | |4. |LG POLYMERS INDIA LTD |3rd Floor, Tower B, |1-124-4692700 - 99 | | | |DLF Building No. 10, |Fax: +91-124-4692701 ...
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...Example Research Paper on Polymer Chemistry: Introduction Polymerization refers to a chemical reaction that results in bonding of two monomers to form a polymer (Tarle, 435). A polymer molecule is made up of hundreds, thousands, or even millions of atoms joined together to form a chain with an extended length at least an order of magnitude greater than its thickness (Peacock & Calhoun, 2006). Polymers have variations of molecular weight (length), branching, steric configuration, interconnections and chemical defects (Tarle, 435). A polymer is made up of many elements. One can consider a polymer as a thread with every link of this string forming a fundamental unit which is in turn made of hydrogen, carbon, silicon and oxygen(Tarle, 435). They are mostly made up of hydrocarbons though other elements such as Sulphur, nitrogen and chlorine may also be found(Carraher & Charles, 2). The molecules are held together by covalent bonds that are branched, linear, or networked to form the polymeric material (Carraher & Charles, 2). While most polymers have carbon as their backbone, others have silicon as the main element holding the polymer (Carraher & Charles, 2). . The history of polymerization The science of polymerisation began way back in the 19th century where alumina-silica glass and phosphoric acid was widely applied to fill dentures (Carraher & Charles, 2). . However, the compounds had very poor mechanical properties and high solubility. This meant that they...
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...for their insolubility in water. (1 mark) (iii) During a practical session, Ms. Chan demonstrated to the students that when water and oil were added to a test tube, the two liquids formed two separate layers. She then added a solution of phospholipids to the mixture of water and oil. With justification, predict where the phospholipids would have dissolved. (3 marks) (b) Figure 2.3 shows part of a DNA molecule. [pic] Figure 2.3 (i) Name the TWO components that make up the part of the DNA molecule labeled as P. (2 marks) (ii) Name the bond labeled as Q. (1 mark) iii) Describe how DNA monomers, nucleotides, join to form a polymer. (2 marks) (c) David learnt that when an egg was fried, the clear egg white surrounding the yolk became solid, white and opaque. He claimed that peptide bonds...
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...Chapter 2 Strain energy functions The aims of constitutive theories are to develop mathematical models for representing the real behavior of matter, to determine the material response and in general, to distinguish one material from another. As described in the preceding chapter, constitutive equations for hyperelastic materials postulate the existence of a strain energy function W . There are several theoretical frameworks for the analysis and derivation of constitutive equations, for example the Rivlin-Signorini method where the governing idea is to expand the strain energy function in a power series of the invariants, or the Valanis-Landel approach expressing the strain energy directly in terms of the principal stretches [115]. In this chapter, we make no attempt at presenting these methods but instead, we present some classical explicit forms of strain-energy functions used in the literature for some isotropic hyperelastic materials. Many other models have been proposed (for example, a collection of constitutive models for rubber can be found in [32]). 2.1 2.1.1 Strain energy functions for incompressible materials Neo-Hookean model The neo-Hookean model is one of the simplest strain energy functions. It involves a single parameter and provides a mathematically simple and reliable constitutive model for the non-linear deformation behavior of isotropic rubber-like materials. Its strain energy function is W= µ (I1 − 3), 2 (2.1) where µ >...
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...Polymers are additives used widely in pharmaceutical systems for numerous objectives, i.e. as suspending, emulsifying and flocculating agents, adhesives, and for packaging and coating materials. Polymers are made up of repeating monomer units with a high molecular weight. Their chemical reactivity depends on the chemistry of their monomer units, but their properties depend mainly on how the monomers are assembled together. Nearly all polymers exist with a range of molecular weight and for convenience the reported molecular weight of a polymer is the average molecular weight. In agree with Florence & Attwood, 2003 water soluble polymers have the capability to increase the viscosity of solvents at low concentrations, to swell in solutions and...
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...COMPARISON OF WATER PIPING PVC and PEX Extended Research Task Introduction Polymers are nearly everywhere we look in present-day society. We use them for many different purposes as certain polymers can have certain characteristics which determine its applications. These characteristics depend on the very small intra and inter molecular bonding as well as their individual functional groups that greatly contribute to their properties. PVC and PEX are two very common polymers used to transport cold water in residential buildings; however their chemical and microscopic structures differ, giving each polymer its own unique properties. The purpose of this investigation is to compare the properties of each polymer determined by their inter and intra molecular structures. Properties needed in pipes for cold water transportation include flexible, lightweight, cost effective and safe for household/buildings. Polyvinyl Chloride Polyvinyl chloride (PVC) has many uses; one of its uses is water piping in residential buildings, due to its low cost, light weight , good insulation and low maintenance (“Polyvinyl chloride,” 2015) it suits the application perfectly. PVC is made from the polymerisation of the monomer vinyl chloride (VCM) displayed in Image 1, and achieves these properties due to its molecular structure. Image 1: Monomer vinyl chloride (VCM) PVC is mainly manufactured via suspension polymerisation; this process is explained in image 2. Image 2: Suspension Polymerization ...
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...of about 678K(about 600 C).Mild steel is mainly iron and a similar calculation indicates annealing can replace a sequence of forming and annealing operations. Alloying: Copper and its alloys are widely used in deep draw and flat stamped products because they have excellent electrical and thermal performance, good resistance to corrosion, high ductility and relatively low cost. Thermoplastic polymeric materials Polymer processing temperature: The effect of temperature change on polymers * When substances made of small molecules are heated, they simply melt and form a free-flowing liquid; however with polymers the process is more complex. * When polymers are cooled, they will often become very brittle. When heated, the polymers will first become flexible before melting. * This is due to their structure. In some polymers, there are areas of crystalline and amorphous regions. In the “glassy” state, the tangled polymer chains in the amorphous region become “frozen”, which prevents easy movement of the chains relative to each other. If the polymer is forced to change shape, it does so by breaking. Polyethylene Polycarbonate Mould temperature : 20 - 95 C (68 - 194 F) (higher temperatures for wall thickness of up to 6 mm; lower temperature for wall thicknesses...
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