Science Ltd. All rights on the tissue engineering of bone and cartilage from the polymeric sca!old point of view. reserved. Keywords: Tissue engineering of bone and cartilage; Design and fabrication of 3-D sca!old; Biodegradable and bioresorbable polymers 1. Introduction Bone and cartilage generation by autogenous cell/tissue transplantation is one of the most promising techniques in orthopedic surgery and biomedical engineering [1]. Treatment concepts based on those techniques would eliminate
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particles have been coated with dextran. To favor its adsorption‚ the polysaccharide was previously substituted with low concentrations of phenoxy groups. The amount of dextran adsorbed onto the PS-DVB surface was examined as a function of the polymer concentration‚ and various samples of beads‚ differing in surface dextran concentration‚ were prepared. The adsorbed polymeric layer was then chemically cross-linked and its stability was checked in the presence of sodium dodecyl sulfate. The hydrophiliccharacter
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Street‚ London W1T 3JH‚ UK Polymer-Plastics Technology and Engineering Publication details‚ including instructions for authors and subscription information: http://www.tandfonline.com/loi/lpte20 Thermal‚ Dynamic Mechanical‚ and Barrier Studies of Potassium Permanganate-LDPE Nanocomposites a a a Rahim Khosravi ‚ Seyed Ali Hashemi ‚ Seyed Alireza Sabet & Amir Masoud Rezadoust a a Department of Composite Engineering and Processing‚ Iran Polymer Institute‚ Tehran‚ Iran Version
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Polypropylene (PP)‚ also known as polypropene‚ is a thermoplastic polymer used in a wide variety of applications including packaging and labeling‚ textiles (e.g.‚ ropes‚ thermal underwear and carpets)‚ stationery‚ plastic parts and reusable containers of various types‚ laboratory equipment‚ loudspeakers‚ automotive components‚ and polymer banknotes. An addition polymer made from the monomer propylene‚ it is rugged and unusually resistant to many chemical solvents‚ bases and acids. Most commercial
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meros=part). Usage The term macromolecule was coined by Nobel laureate Hermann Staudinger in the 1920s‚ although his first relevant publication on this field only mentions high molecular compounds (in excess of 1‚000 atoms).At that time the phrase polymer‚ as introduced by Berzelius in 1833‚ had a different meaning from that of today: it simply was another form of isomerism for example with benzeneand acetylene and had little to do with size. Usage of the term to describe large molecules varies among
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Synthetic fibers are made from synthesized polymers or small molecules. The compounds that are used to make these fibers come from raw materials such as petroleum based chemicals or petrochemicals. These materials are polymerized into a long‚ linear chemical that bond two adjacent carbon atoms. Differing chemical compounds will be used to produce different types of fibers. Although there are several different synthetic fibers‚ they generally have the same common properties. Generally‚ they are known
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a) Describe the process by which the biopolymer is produced naming any biological and chemical agents used to produce it. Biopolymers are naturally occurring polymers. One example is poly-hydroxybutanoate (PHB). PHB can be produced in a lab by feeding bacteria a diet rich in nutrients until large colonies form and then withdrawing glucose. The bacteria immediately start secreting PHB‚ which provides them with an energy store. In the 1980‚ the three genes in Alcaligenes eutrophus needed for the production
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Spandex fibers were first produced by Farbenfabriken Bayer. He was a pioneer in polymer chemistry and in 1952 earned a German patent for his synthesis. The final development of spandex was produced by scientists at Du Pont and the U.S. rubber Company. Du Pont used the brand name Lycra. They soon began manufacturing in 1962. Du Pont is the world’s leader in spandex production. Spandex development first started in during World War II as a substitute for rubber. Since rubber was being used for the
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PPV‚ which is the abbreviated term for phenylenevinylene‚ has light emitting properties since it has a large conjugated system. This organic molecule is possible to be formed from dichloro-para-xylene which then reacts with methanol and thiolane. The nucleophile would be the thiolane. A good leaving group in this case would be chlorine. After thiolane attacks‚ it results with dithiolane-xylene. The second step is reaction with sodium hydroxide. The hydroxide it used for deprotonation upon the substituted
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viscosity of the formulation increased with an increase in sodium alginate and pectin concentration (Table 5.3). This phenomenon is a consequence of increasing chain interaction with an increase in polymer concentration. The change in viscosity is proportional to the change in concentration and polymer ratio. The buoyancy lag time in simulated gastric fluid (0.1 mol L-1HCL‚ pH 1.2) varied with the formulation variables. Formulation P1 exhibited the least buoyancy lag time (26 s) while formulation
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