of free space and ε″ is the dielectric loss (ε”= εr tan δ). The ac conductivities at different frequencies for the polymer composites
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Processes II Instructor: Ramesh Singh; Notes: Prof. Singh/ Ganesh Soni 3 COMPOSITES A composite material consists of two phases: • Primary – Forms the matrix within which the secondary phase is imbedded – Any of three basic material types: polymers‚ metals‚ or ceramics • Secondary – Referred to as the imbedded phase or called the reinforcing agent – Serves to strengthen the composite (fibers‚ particles‚ etc.) – Can be one of the three basic materials or an element such as carbon or boron
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Identification and Production of Materials ================================ Ethene‚ Polymers and Ethanol ================================ Catalytic Cracking Oil refineries need to balance their outputs of various products (petrol‚ diesel‚ fuel oil‚ etc.) to match the demands of the marketplace. Catalytic cracking is the process in which high molecular weight (high boiling point) fractions from crude oil are broken into lower molecular weight (lower boiling point) substances in order to increase
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absorbency of commercialized sanitary napkins.” The objective of the study was to extract a protein from the oyster shells to produce aspartic acid which can replace the manufactured polymer found in commercialized sanitary napkins. The significance of our study is that the product is an alternative in producing polymers. It is also environmental friendly; biodegradable and is easy and affordable to produce. The researchers produced the aspartic acid in a few simple steps. The oysters were submerged
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ratio of 70:20:10 of L-LA‚ GL and Ɛ-CL respectively using the catalyst tin(II)2-ethyl hexanoate. The chemical reaction is given in the figure1. The yield % of the synthesized polymer was calculated by the equation: Yield %= (Weight of synthesized polymer)/(Weight of the monomers taken) ×100 Characterization of synthesized polymer: Chemical analysis using Fourier transform infrared Spectroscopy: Fourier transform infrared (FTIR) spectrum of monomers and synthesized PLGC was obtained in the range of
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2012:7 1851–1863. 3) Carla Mura‚ Maria Manconi‚ Donatella Valenti‚ Maria Letizia Manca‚ Octavio Díez-Sales‚ Giuseppe Loy‚ Anna Maria Fadda. In vitro study of N-succinyl chitosan for targeted delivery of 5-aminosalicylic acid to colon. Carbohydrate Polymers‚ Volume 85‚ Issue 3‚ 1 June 2011‚ Pages 578-583. 4) Aiedeh‚ K.‚ and Taha‚ M. O. 1999. Synthesis of chitosan succinate and chitosan phthalate and their evaluation as suggested matrices in orally administered‚colon specific drug delivery systems. Arch
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the products manufactured by Eastman.[5] Coatings‚ adhesives‚ specialty polymers and inks Utilizing raw materials including propane‚ ethane‚ butane‚ high sulfur coal‚ natural gas‚ wood pulp and acetone‚ Eastman produces several products in this category. Products include cellulosic polymers‚ cellulose esters‚ adhesion promoters‚ Texanol ester alcohol‚ solvents‚ hydrocarbon resins‚ rosin resins‚ resin dispersions‚ and polymer raw materials. These products are used for a variety of purposes ranging
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spontaneous. This activity was also designed to determine if a change is spontaneous by using change in enthalpy and change in entropy with the structure of polymers. Hypothesis: If you heat the rubber band and then streatch it‚ then the rubber band will become shorter meaning it will release eneregy because it is not relaxed and the polymers are disordered. Observations: During the avtivity we observed many things. Due to this experiment i have observed many things such as the fact that when
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Carbohydrate Polymers 95 (2013) 530–539 Contents lists available at SciVerse ScienceDirect Carbohydrate Polymers journal homepage: www.elsevier.com/locate/carbpol In vivo evaluation of chitosan–PVP–titanium dioxide nanocomposite as wound dressing material D. Archana a ‚ Brijesh K. Singh a ‚ Joydeep Dutta b ‚ P.K. Dutta a‚∗ a b Department of Chemistry‚ Motilal Nehru National Institute of Technology‚ Allahabad 211004‚ India Department of Humanities and Applied Sciences‚ Institute
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molecules and atoms that are bonded together. These are among the largest of all chemical molecules. A. Polymers-the largest of the macromolecules. These are composed of numerous‚ small identical subunits known as Monomers. There are 4 major polymers that are important for living organisms. These polymers are; carbohydrates‚ lipids‚ proteins and nucleic acids. B. Polymers are referred to as being organic compounds. Organic compounds are compounds that contain the elements
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