(Monomers). 6. 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. The molecular weigh remains roughly the same (400,000-700,000 Da), but thermal properties correlate with the ratio of these monomer units. 331 Weight average molecular weight Number average molecular weight Molecular weight Amount/frequency Figure A1.1. 2. weight of repeat unit is equal to molecular weight of the polymer. More than 100 repeating units of carbon, oxygen, hydrogen and nitrogen atoms make up the long chain nylon molecule. Nylon-6,6 is made from two monomers each of which contain 6 carbon atoms - hence its name. (That is different from Kevlar, where the repeating units contain benzene rings - see below.) . 1 decade ago . 7.3 A nylon 6,6 has an average molecular weight of 12,000 g/mol. Table 3 Comparisons between two polymers that produced by different methods . Wrapping on the glass rod. 7.7 for its mer structure.) PROPERTY: UNIT: VALUE / RANGE: PREFERRED: Molecular Weight of Repeat unit: g mol-1: 282.4 Ex: calculate the degree of polymerization of a sample of polyethylene [ (CH 2-CH 2) n], which has a molecular weight of 150,000 g/mol. 1 6 7 8. Compute repeat unit molecular weights for the following: (a) Polytetrafluoroethylene (b) Poly(methyl methacrylate) (c) Nylon 6,6 (d) Poly(ethylene terephthalate) Actual number of mole of repeating unit = 0.4272g / 282 g mol-1 = 0.0015 mol . 7. This particular material is therefore known as nylon-6.6. 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%. The number-average molecular weight of a polypropylene is 1,000,000 g/mol. 2.Nylon 6,6 has long molecular chains resulting in more hydrogen bonds , creating chemical springs and making it very resilient .. 3. Thus, the molecular weight of the styrene repeat unit is: m s = 8(A C) + 8(A H) = 8(12.01 g/mol) + 8(1.008 g/mol) = 104.14 g/mol Let f b be the chain fraction of butadiene repeat units. IUPAC nomenclature: monomer is named according to IUAPC. Thermophysical properties of Nylon 6-10. Problem 4.4 (a) Compute the repeat unit molecular weight of polypropylene. Method to produce polymers. Relevance. Mimenda Lerenda. 1. The DIUTHAME(+) mass spectrum of PCL (Figure If the monomer name consists of more than one word, or if the name is preceded by a letter or number, the monomer name is enclosed in parenthesis. 4-Hydroxybutyrate (4HB) is produced from 1,4-butanediol by microorganisms such as The filaments are normally drawn to 350–400%. The molecular weight of a particular polymer molecule is a product of the degree of polymerization and the molecular weight of the repeating unit. Recently Viewed Questions of Class 12th chemistry. Favourite answer. In 1920, Wallace Carothers proposed a Carothers equation relating \( \overline{DP} \) to monomer conversion (p) as Eq. The word ‘ Polymer’ is coined from two Greek words: poly means many and mer means unit or part. In addition to synthetic polymers, such as, polyvinyl chloride, polystyrene, nylon and Teflon, we also find natural polymers all around us in the form of proteins and DNA. Nylon 6,6 is an amorphous solid so it has a large elastic property and is slightly soluble in boiling water . Calculate the Dp. Molecular weight of repeating unit = 282 g mol-1. 5 ), where the repeating unit contains two carbon atoms and four hydrogen atoms, the molecular weight is 28n, where n represents the number of repeating segments. Nylon 6,6 has long molecular chains resulting in more hydrogen bonds , creating chemical springs and making it very resilient . M.W. Shellac. The Turbidity is related to molecular weight by the equation given by Debye. The original 'nylon' has a repeating unit of the following composition;-NH
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