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General Chemical Investigations: Polymer Science Investigations Ms. Jiaqi Zhang and Ms. Kefan Li (Partner) Submitted to: Ms. Kuljeet Kaur (GTA) CHEM 1045, Experiment No. 7, October 31, 2015 LABORATORY WRITTEN REPORT Honor Code Signature: Abstract: This experiment is in order to introduce the relationship between molecular weight, topology, rheology, chemical composition and Polymer. Finishing this experiment, we can learn how different identifications can determine different polymers, and we found that protein is similar to polymer, higher molecular weight higher viscosity, and network structured polymers are not soluble. In the part 1, identification of common synthetic polymers, synthetic polymer is identified through mixing the egg white proteins with ethanol. In the part 2, we use flow through a capillary, measure the time CMC flow through a Capillary and Brookfield Viscometer to measure the viscosity of CMC samples. In the part 3, there are two different systems to crosslink. First is investigation a two-part adhesive, and second is biocompatible polymer systems. I.Introduction Polymers are made up of many molecules all strung together to form really long chains (and sometimes more complicated structures, too). Polyethylene (PE) is a member of the important family of polyolefin resins. It is the most widely used plasticin the world, being made into products ranging from clear food wrap and shopping bags to detergent bottles and automobile fuel tanks. It can also be slit or spun into synthetic fibers or modified to take on the elastic properties of a rubber. Polymer science is considered its own discipline of chemistry. There are eight basic fundamental polymer parameter must be considered in polymer science. In this experiment, we need investigate chemical composition, molecular weight, topology and rheology.
Chemical Composition of the monomer(s) determines the final chemical composition of the polymer. Smaller molecules must go through polymerization to become synthetic polymers. Synthesis polymers use two basic synthetic methods: Step-growth and chain-growth polymerization. During this experiment, we will identify the synthetic polymers using density differences and chemical composition. For molecular weight, there is no predefined value of the molecular weight of a polymer. The molecular weight depends on the number of monomer units combined during the polymerization. The higher the molecular weight is, the higher the viscosity of the polymer. Rheology, the study of the flow and deformation of matter, is an old discipline undergoing a renaissance. Measuring viscosity of fluids represents an important aspect of rheology.