Mimenda Lerenda. The term polymer is defined as very large molecules having high molecular mass. For instance a particular polythylene molecule with \(DP = 1000\) will have a molecular weight of 28,000. Chemical structure of shellac. 1 6 7 8. Problem 4.4 (a) Compute the repeat unit molecular weight of polypropylene. a SALDI mass spectrum recorded using a DIUTHAME chip will be referred to as the “DIUTHAME mass spectrum”. Turbidity increase with increase in concentration as well as molecular weight. The DIUTHAME(+) mass spectrum of PCL (Figure A polymer’s molecular weight is related to that of the monomer, and the number of monomers present in the polymer molecule. 7.7 for its mer structure.) 6.11. . Calculate the mass of a non-volatile solute (molar mass 40 g mol-1) which should be dissolved in 114 g octane to reduce its vapour pressure to 80%. Nylon 6,6--226.32 g/mol. (b) Compute the number-average molecular weight for a polypropylene for which the degree of polymerization is 15,000. Nylon 6,6 is an amorphous solid so it has a large elastic property and is slightly soluble in boiling water . When there is more initiator and monomer in the reaction, the total molecular weight of the final product will be increased. Ex: Starch, Polyvinyl chloride, Polyethylene, Nylon 6, 6 and etc. The small molecular unit is called a monomer. The molecular weight of a particular polymer molecule is a product of the degree of polymerization and the molecular weight of the repeating unit. The Turbidity is related to molecular weight by the equation given by Debye. Nylon 6,6 is an amorphous solid so it has a large elastic property and is slightly soluble in boiling water . The degree of polymerization, or DP, is the number of monomeric units in a macromolecule or polymer or oligomer molecule.. For a homopolymer, there is only one type of monomeric unit and the number-average degree of polymerization is given by ≡ =, where M n is the number-average molecular weight and M 0 is the molecular weight of the monomer unit. (b) Compute the number-average molecular weight for a polypropylene for which the degree of polymerization is 15,000. Percentage yield = 0.0015 mol / 0.013 mol x 100% = 11.54% . There are various different types of nylon depending on the nature of those chains. Molecular weight of repeating unit = 282 g mol-1. Thus. The following table lists molecular weight data for a polypropylene material. Simple mass spectra were recorded in the positive-ion mode for high-molecular-weight PCL, PET, nylon-6, or nylon-12 with the detection of the protonated repeating unit as the main feature. IUPAC nomenclature: monomer is named according to IUAPC. Unlike PET, both nylon fibers are fairly crystalline as spun. 4-Hydroxybutyrate (4HB) is produced from 1,4-butanediol by microorganisms such as Weight of nylon 6,10 obtained experimentally = 0.4263g . Nylon-6,6. Dilute solution viscometry study showed that nylon-6 polymer in the nanocomposites has a lower molecular weight than that of neat nylon-6 polymer polymerized with same concentration of the initiator. Nylon 6,6 has a repeat unit with molecular weight of is 226.32 g/mol and crystalline density of 1.24 g/(cm)^3 . In nylon, the repeating units contain chains of carbon atoms. PET--192.16 g/mol. During chain-growth polymerization, high-molecular-weight polymer is formed early during the polymerization, and the polymerization yield, or the percent of monomer converted to polymer, gradually increases with time. The original 'nylon' has a repeating unit of the following composition;-NH98%). 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