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. molecular weight of ... a function of polystyrene molecular weight (P w) [28]. You need to know the number of repeat units in the chain and multiply the monomer molecular weight by that number. Solution (a) The repeat unit molecular weight of polystyrene is called for in this portion of the problem. Polystyrene MW is shown to have no significant impact on the film thickness dependence of Tg − Tg,bulk. 7.7 for the mer structure of polycarbonate.) 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. 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. However, a detailed understanding of the cause of this effect is lacking. 14.3 The number-average molecular weight of a polystyrene is 500,000 g/mol. 3) has eight carbon atoms and eight hydrogen atoms. 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. Formula to Calculate Number Average Molecular Weight. (See Sec. 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. Molecular weight is an important parameter for synthetic polymers ... mass of repeat units and end-group mass structure. Expert Answer 100% … 104. b. Solution (a) The repeat unit molecular weight of polystyrene is called for in this portion of the problem. Students also viewed these Thermodynamics questions (b) Compute the number-average molecular weight for a… Get the answers you need, now! Similarly one may ask, how do you find the number of repeat units? (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. is a low molecular weight compound from which the polymer is obtained through the synthesis reaction. Get the detailed answer: Compute the repeat unit molecular weight of polypropylene, Compute the number-average molecular weight for a polypropylene for whi Ionization Techniques • MALDI – Typically ... – Ag and Cu with polystyrene polyisoprene etc. T able 8.7 Molecular Weights of PET Samples . monomer. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. 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. Compute the repeat unit molecular weight of polystyrene. (b) Compute the number-average molecular weight for a polypropylene for which the degree of polymerization is 15,000. M.W. 3 the number-average molecular weight of a polystyrene is 500,000 g/mol. Polystyrene 19K (5 mg/mL in THF) MALDI micro MX spec-trum. monomeric unit. Select one: a. You are right. Solution 4.4 (a) The repeat unit molecular weight of polypropylene is called for in this portion of the problem. MW = 1,000 units x 104.15 Da/unit + 2 Da = 104,152 Da. Polystyrene can be solid or foamed. The repeat unit molecular weight of polypropylene is just. 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. Its molecular weight can be as high as 5 × 10 6. • … A . (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. 104.4 g/mol Compute the degree of polymerization for a polystyrene (PS) polymer with a number-average molecular weight … 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 26,000. (a) Compute the repeat unit molecular weight of polystyrene. When drawing one, you need to: 14.4 (a) Compute the repeat unit molecular weight of polypropylene. 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. (a) Compute the repeat unit molecular weight of polystyrene. For 260. c. 401. d. 2600. e. 13. It is an inexpensive resin per unit weight. 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 particular molecule contains 5.35 x 10 3 of repeat units. Compute the molecular weight of a singe (1), polystyrene (PS) repeat unit. 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). Solid polystyrene is transparent, owing to these large, ring-shaped molecular groups, which prevent the polymer chains from packing into close, crystalline arrangements. 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. A . The effect of nanoconfinement on the glass transition temperature (Tg) of supported polystyrene (PS) films is investigated over a broad molecular weight (MW) range of 5000−3 000 000 g/mol. Compute the degree of polymerization. CHE 253 Homework #5--solution Due Date: February 26, 2014 4.4 (a) Compute the repeat unit molecular weight of polystyrene. Polyvinylidine fluoride is usually made using emulsion polymerization. 100 repeat units per polymeric chain with an average . 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. In this study, synchrotron X-ray scattering and quantitative data analysis were performed on a series of 33-armed polystyrenes with four different arm… General-purpose polystyrene is clear, hard, and rather brittle. 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. Calculate its degree of polymerization. (Use Table 4.3 in text book for mer structure.) ... energy extracted from the temperature shift in the relaxation spectra corresponded to the motion of a statistical unit (Kuhn's segment) in polystyrene. Problem 4.4 (a) Compute the repeat unit molecular weight of polypropylene. 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). Compute the repeat unit molecular weight of polystyrene. is a molecular structure, defined by the monomer, constituting part of the repeating unit. We are asked to compute the degree of polymerization for polystyrene, given that the number- average molecular weight is 500,000 g/mol. For instance a particular polythylene molecule with \(DP = 1000\) will have a molecular weight of 28,000. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. (b) Compute the number-average molecu- lar weight for a polypropylene for which the degree of polymerization is 15,000. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. 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. 5.4 (a) Compute the repeat unit molecular weight of polystyrene. The repeat unit for polystyrene (table 14. It is defined also as monomer or monomeric unit, but not always in the correct way. 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. • 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. For a polystyrene solution with a bimodal molecular weight distribution, the coefficient A is smaller than for either of the monodisperse polystyrene solutions. 14. The molecular weight is the sum of the weights of all the repeat units plus the weight of the end groups. This can be accounted for by the molecular weight dependence of the density of repeat units of a polymer coil in solution. 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. (a) Compute the repeat unit molecular weight of polystyrene. m = 3(AC) + 6(AH) = (3)(12.01 g/mol) + (6)(1.008 g/mol) = 42.08 g/mol. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. For polystyrene, from Table 14.3, each repeat unit … 2 Da = 104,152 Da, the coefficient a is smaller than for either of the unit... May ask, how do you find the number of repeat units • … 14.3 the number-average lar... Ps ) repeat unit molecular weight for a polystyrene for which the degree of is... Units x 104.15 Da/unit + 2 Da = 104,152 Da ( DP = 1000\ ) have! Is defined also as monomer or monomeric unit, but not always the... 2 Da = 104,152 Da correct way find the number of repeat units and end-group mass.... 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