Ionization Techniques • MALDI – Typically ... – Ag and Cu with polystyrene polyisoprene etc. Select one: a. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 26,000. You need to know the number of repeat units in the chain and multiply the monomer molecular weight by that number. For polystyrene, from Table 14.3, each repeat unit … 100 repeat units per polymeric chain with an average . The effect of nanoconfinement on the glass transition temperature (T g) of supported polystyrene (PS) films is investigated over a broad molecular weight (MW) range of 5000-3 000 000 g/mol. (b) Compute the number-average molecular weight for a polypropylene for which the degree of polymerization is 15,000. Problem 4.4 (a) Compute the repeat unit molecular weight of polypropylene. If you can determine the molecular weight of the polymer chain (end group analysis, mass spectrometry (MALDI, preferably), gel permeation chromatography) then you divide the obtained mass by the molecular weight of the repeat unit. 14.3 The number-average molecular weight of a polystyrene is 500,000 g/mol. Polystyrene (PS) / ˌ p ɒ l i ˈ s t aɪ r iː n / is a synthetic aromatic hydrocarbon polymer made from the monomer known as styrene. Solid polystyrene is transparent, owing to these large, ring-shaped molecular groups, which prevent the polymer chains from packing into close, crystalline arrangements. It is an inexpensive resin per unit weight. Repeating units Polymer molecules are very large compared with most other molecules , so the idea of a repeat unit is used when drawing a displayed formula. For a given molecular weight the relaxation spectra at ... energy represented by this distribution was associated with an activation energy required for the motion of a chemical repeat unit. For 260. c. 401. d. 2600. e. 13. Polystyrene average Mw 35,000; CAS Number: 9003-53-6; Synonym: PS; Linear Formula: [CH2CH(C6H5)]n; find Sigma-Aldrich-331651 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich. Solution (a) The repeat unit molecular weight of polystyrene is called for in this portion of the problem. 104. b. 7.7 for the mer structure of polycarbonate.) The repeat unit for polystyrene (table 14. Solution 4.4 (a) The repeat unit molecular weight of polypropylene is called for in this portion of the problem. Formula to Calculate Number Average Molecular Weight. Solution (a) The repeat unit molecular weight of polystyrene is called for in this portion of the problem. Answer b: MW = 200 units x 72.06 Da/unit + 2 Da = 14,412 Da (based on 200 simple repeating units, but this is a complicated case. 5.4 (a) Compute the repeat unit molecular weight of polystyrene. Compute the molecular weight of a singe (1), polystyrene (PS) repeat unit. In this study, synchrotron X-ray scattering and quantitative data analysis were performed on a series of 33-armed polystyrenes with four different arm… (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. monomeric unit. Polyvinylidine fluoride is usually made using emulsion polymerization. is a low molecular weight compound from which the polymer is obtained through the synthesis reaction. The particular molecule contains 5.35 x 10 3 of repeat units. Similarly one may ask, how do you find the number of repeat units? The repeat unit molecular weight of polypropylene is just. General-purpose polystyrene is clear, hard, and rather brittle. It is well known that the glass transition temperatures, Tgs, of supported polystyrene (PS) films decrease dramatically with decreasing film thickness below 60-80 nm. Polystyrene MW is shown to have no significant impact on the film thickness dependence of Tg − Tg,bulk. We are asked to compute the degree of polymerization for polystyrene, given that the number- average molecular weight is 500,000 g/mol. 14.4 (a) Compute the repeat unit molecular weight of polypropylene. A . (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. 3) has eight carbon atoms and eight hydrogen atoms. m = 3(AC) + 6(AH) = (3)(12.01 g/mol) + (6)(1.008 g/mol) = 42.08 g/mol. (a) From Equation 14.6, the average repeat unit molecular weight of the copolymer, m calculated as:, is DP From Table 14.5, the butadiene repeat unit contains 4 Carbon atoms and 6 Hydrogen atoms. When considering the molecular weight of a polymer for the above calculation, we usually take either the number average molecular weight (M n) or weight average molecular weight (M w). (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. Compute the repeat unit molecular weight of polystyrene. Compute the degree of polymerization. (a) Compute the repeat unit molecular weight of polystyrene. When drawing one, you need to: Calculate its degree of polymerization. 3 the number-average molecular weight of a polystyrene is 500,000 g/mol. ... energy extracted from the temperature shift in the relaxation spectra corresponded to the motion of a statistical unit (Kuhn's segment) in polystyrene. Polystyrene can be solid or foamed. The molecular weight of a particular polymer molecule is a product of the degree of polymerization and the molecular weight of the repeating unit. Compute the repeat unit molecular weight of polystyrene. 14. Its molecular weight can be as high as 5 × 10 6. M.W. (a) Compute the repeat unit molecular weight of polystyrene. For instance a particular polythylene molecule with \(DP = 1000\) will have a molecular weight of 28,000. MW = 1,000 units x 104.15 Da/unit + 2 Da = 104,152 Da. The molecular weight is the sum of the weights of all the repeat units plus the weight of the end groups. is a molecular structure, defined by the monomer, constituting part of the repeating unit. m n= M = 350, 000 g/mol 4425 = 79.10 g/mol Thus, the molecular weight of the butadiene repeat unit is : … 14.5 Below, molecular weight data for a poly- tetrafluoroethylene material are tabulated. Reinhard Kniewske, Werner‐Michael Kulicke, Study on the molecular weight dependence of dilute solution properties of narrowly distributed polystyrene in toluene and in the unperturbed state, Die Makromolekulare Chemie, 10.1002/macp.1983.021841021, 184, 10, (2173-2186), (2003). molecular weight of polymer (g/mol) 12,000 g/mol DP molecular weight of mer (g/mol/mer) 226 g/mol/mer ===53 mers 7.4 An injectionŒmolding polycarbonate material has an average molecular weight of 25,000 g/mol. monomer. Now it is possible to compute the degree of polymerization using Equation 14.6 as 14.4 (a) Compute the repeat unit molecular weight of polystyrene. Compute the repeat unit molecular weight of polystyrene and the number-average molecular weight of the material if the degree of polymerisation is 25000. This can be accounted for by the molecular weight dependence of the density of repeat units of a polymer coil in solution. Polystyrene 19K (5 mg/mL in THF) MALDI micro MX spec-trum. Get the detailed answer: Compute the repeat unit molecular weight of polypropylene, Compute the number-average molecular weight for a polypropylene for whi (See Sec. (Use Table 4.3 in text book for mer structure.) About Polystyrene; 1 cubic meter of Polystyrene weighs 1 060 kilograms [kg] 1 cubic foot of Polystyrene weighs 66.17364 pounds [lbs] Polystyrene weighs 1.06 gram per cubic centimeter or 1 060 kilogram per cubic meter, i.e. For a polystyrene solution with a bimodal molecular weight distribution, the coefficient A is smaller than for either of the monodisperse polystyrene solutions. However, a detailed understanding of the cause of this effect is lacking. Solution (a) The repeat unit molecular weight of polystyrene is called for in this portion of the problem. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. CHE 253 Homework #5--solution Due Date: February 26, 2014 4.4 (a) Compute the repeat unit molecular weight of polystyrene. Expert Answer 100% … T able 8.7 Molecular Weights of PET Samples . (b) Compute the number-average molecu- lar weight for a polypropylene for which the degree of polymerization is 15,000. (a) Compute the repeat unit molecular weight of polystyrene. The structure of the polymer repeating unit can be represented as: The presence of the pendant phenyl (C 6 H 5) groups is key to the properties of polystyrene. • Molecular Weight Distribution – Mn - Number Average – Mw - Weight Average – Pd - Polydispersity • Repeat Unit Mass – Repeat Unit Molecular Formula • End Group Mass – End Group Molecular Formula. A . • … It is defined also as monomer or monomeric unit, but not always in the correct way. 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