Chemistry Name: Chun Ka Yuen (52180145) Group: C Date of experiment: 30/3/2012 Date of report: 3/4/2012 Experiment 5: Polymers Aim: This experiment is to prepare polymeric materials including polystyrene‚ Nylon6‚ 10‚ and cellulose triacetate. Introduction: A polymer consists of repeating subunits in the form of –A-A-A-A-A- or A-B-A-B-A-B-‚ where A and B are different subunits. These sub-units are typically connected by covalent chemical
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Sean Byrne Teacher Biology Honors 13 August 2014 Unit 1 Chapter 3 1) a. Monomers are small‚ simple molecules that when put together create carbon compounds‚ and polymers are molecules that consist of repeated units. b. Functional groups are made of clusters of atoms‚ while macromolecules are large polymers. c. A monosaccharide is a simple sugar‚ but a disaccharide is known as a double sugar‚ or two monosaccharaides. d. Long chains of amino acids are called polypeptides‚ and proteins are composed
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engineering stress-strain diagram to obtain the following properties: modulus of elasticity; yield strength; tensile strength‚ and percent elongation. 6) Describe a typical polymer molecule in terms of its chain structure and repeating units‚ and calculate number-average and weight-average molecular weights for a specified polymer. Objectives: Page 1 7) Cite the differences in thermo-mechanical behavior between
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linkage CONDENSATION REACTIONS 9. The sugar important in brewing beer is MALTOSE 10. the most prevalently used disaccharide is SUCROSE 11. Macromolecules that are polymers of a few hundred to a few thousand monosaccharides POLYSACCHARIDES 12. Lipids are LARGE CLASS OF BIOLOGICAL MOLECULES THAT DOES NOT INCLUDE POLYMERS. 13. Lipids with no double bonds between carbons in fatty acid tail SATURATED FATS 14. One or more double bonds between carbons in fatty acid tail UNSATURATED FATS
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research [2-4] confirmed that esophageal stent implantation for esophageal benign stricture can achieve satisfactory results. Metal and polymer stents are now the most widely used
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History of Plastics Contact Us Composite Plastics Mechanical Plastics Performance Plastics Fluoroplastics Transparent Plastics Forming Grade Plastics Corrosion Resistant Plastics Film & Graphic Plastics Fluid Handling Tubing Insulation Tubing & Sleeving History of Plastics The United States plastics industry is a multi-billion dollar business‚ and it is still growing at a rate faster than most other industries in this country. Plastics have been used in every major market
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NAME ON THE TOP OF EACH PAGE. All Answers should be written in the provided space. Each Question is worth 5 pts. A maximum of 20 pts may be added to your first exam 20 x (correct pts / total pts) Question 1 Actin and tubulin form self-assembling polymers. Where on the filaments do subunits exchange with free monomers? Subunit exchange with free monomers occurs at the end of filaments. In actin filaments‚ subunits can be freely exchanged at both ends of the filament (pointed and barbed ends) until
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degree in Chemistry in 1946. She began work at DuPort research Laboratory where she conducted low-temperature experiments for preparation of polymers for the creation of highly rigid and strong petroleum-based fibres. Kwolek made a solution that caused unstable intermediates from these experiments to bond into long chains. Under these conditions‚ the polymers formed a cloudy fluid in contrast to the clear and sticky
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plastics together is a new concept to many people. In reality‚ polymers are not like salt‚ which is totally crystalline‚ but are semi-crystalline. Unlike crystals like salt‚ polymers have only short-range order and a much looser organization. Crystallinity is one of the great divisions of the complete family of plastics. Amorphous polymers (those with no significant degree of crystallization) behave very differently than crystalline polymers (those with a significant degree of crystallization). Understanding
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nano-filler show only minor improvement of about 17% in the modulus values. Young’s modulus in nano-composites does not undergo much change in the elongation to break values; this can be associated with the disappearance of plastic deformation of the polymer
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