(n.d.). Retrieved April 17, 2016, from http://www.slideshare.net/ ripestone_ho/polymers-and-their-properties INTERESTING facts about Isotactic Polypropylene Polypropylene is a versatile thermoplastic polymer. It can be moulded into different shapes and sizes and hence, can be put to many uses (material used to make chairs, containers, tools etc.) It is hard but flexible. (semi-rigid) It is lightweight!
Polyester Fibres Indtroduction: Polyester are polymers made by a condensation reaction taking place between small molecules, in which the linkage of the molecules occurs through the formation of estes groups. Polyesters are commonly made by interaction of a dibasic acid with a dihydric alcohol: HOOC-X-COOH+HO-Y-OH OC-X-COO-Y-OCO-X-COO-Y-OCO The formation of polyester was studied by Wallace H. Carothers of du Point during the investigation of polyesters which lead eventually to the discovery of nylon. Development of the polyesters was overshadowed, however, by the polyamide research, and it was not until 1941 that a valuable polyester fibre was discovered. in that year, J. T. Dickson and J. R. Winfield of the Calico Printers'
Question 1 Question Topic: A1 – Identification of Materials – Physical Characteristics Question: Given the Monomer Unit structure below answer the following: A: Name the plastic relating to it B: Write the density for both amorphous and crystalline (in g/cm^3) C: List 2 things commonly made with it. D: CALCULATE the molecular weight of polypropylene (g/mol) Answer: The plastic relating to the monomer structure above is Polypropylene. (PP) Polypropylene is one of the lower density fibers. The density for amorphous is 0.855 g/cm^3 and the density for crystalline is 0.946 g/cm^3. Polypropylene usually polymerizes by addition.
Column It is heart of HPLC system made up of heavy-walled glass tubing or precision-bore stainless steel. The most common type of packing for HPLC columns is finitely divided Silica gel, Alumina and Celite. A second type of packing material is called pellicular, consists of small beads coated with layer of a porous material such as silica gel, alumina or ion exchange resin. 6. Detector This detector is used for measurement of specific physical and chemical properties of the column effluent.
Introduction : Liposomes were discovered in the early 1960 by Bangham and colleagues (Bangham et al., 1965 ) and subsequently became the most extensively explored drug delivery system. Liposomes are concentric bilayered vesicle in which an aqueous volume is entirely enclosed by a membranous lipid bilayer mainly composed of natural or synthetic phospholipids. A liposome can be formed at a variety of sizes as uni-lamellar or multi-lamellar construction, and its name relates to its structural building blocks, phospholipids, and not to its size. Liposomes are artificially prepared vesicles made of lipid bilayer. The name liposome is derived from two Greek words: 'Lipos' meaning fat and 'Soma' meaning body.
polybutadiene, hydrin rubber, polyisobutylene, silicon rubber, nitrile, acrylonitrile, neoprene, butyl rubber etc. Synthetic Polymers: such as, polyvinyl alcohol, polyvinylchloride, polyethylene, polypropylene, polyacrylate, polyamide, polyurea, polyvinylpyrrolidone, polymethylmethacrylate etc
Among these metals the most widely studied metals for their antimicrobial nature are silver and copper (Ingle et al 2008 and Umer et al 2012). Copper and silver nanoparticles have gained considerable attention due to their significant and broad spectrum bioactivity. Currently these nanoparticles find utility as antimicrobial formulations, biomedical and surgical devices. Silver ions have been used as an antibacterial component in the coatings of devices employed in medical procedures. Silver and copper in the form of nano particles is also known to exhibit strong bactericidal effects on gram positive and gram negative
Introduction: High Performance Liquid Chromatography or also known as High Performance Liquid Chromatography is one of the most powerful and most commonly used analytical separation technique. HPLC is a form of liquid chromatography that separated solutes/compounds dissolved in the solution (High-performance liquid chromatography, 2012). It is an improved form of column chromatography, where the solvent is passed through under high pressure instead of letting it drip down due to gravity. The sample is injected into the column to separate the sample of interest. The two different phases in HPLC are mobile and stationary phase.
Starting with advantages of using this method with the main key point is the lesser fuel usage for the catalytic oxidation process. Next the catalyst employed in this reaction has high activity for the production of unsaturated nitrile and can be use in lower reaction temperature. Furthermore it has stable redox stability under the reaction condition of the process. By using the circularly fluidized bed reactor (CFB) its help to produce high yield product by separating the catalyst reduction zone and the re-oxidation process and it can be controlled independently. Methodology process can be more simplified for adding and removing catalyst using this type of reactor.
Ethylene glycol has been widely used in the polyol process for the synthesis of metal (pure and alloyed) nanoparticles due to its strong reducing power and relatively high boiling point (~1970C). In this method ethylene glycol (fisher scientific 99.5%) is used as solvent and strong base sodium hydroxide (NaOH) (Qualigens 98%) is used as reducing agent along with NaBH4. Iron chloride tetra hydrate (FeCl2.4H2O) (Moly Chem 98%), Cobaltous acetate (Co(CH3COO)2.4H2O) (sd-fine chem. Limited 99%) are the metal precursors used in this Co and FeCo synthesis, PVP (C6H9NO)n (sigma Aldrich 99.9%) acts as surfactant. 2.1 Synthesis of Co Nanoparticles 2.1.1 Experimental