The basic concepts of molecular weight, molecular weight distribution and MFI are explained below. It is resistant to extreme pH conditions and is insoluble in most solvents at room temperature. Click here to access Table 14.3. 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. 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. polypropylene (PP) with DP = 100,000; Answer a: The molecular weight is the sum of the weights of all the repeat units plus the weight of the end groups. As the following example illustrates, this method can be used even in situations where repeating unit proton signals overlap, as long as there is a clearly distinguishable signal from one of the repeating units. (a) Compute the repeat unit molecular weight of polypropylene. This is a broad statement and may confuse more than explain. Home. Molecular weight (MW) A polymer (poly = many) is made up of many repeated units of a monomer (mono = one). 21 CFR 175.105 (USFDA); U.S. National Archives and Records Administration's Electronic Code of Federal Regulations. Switch to. MW = 1,000 units x 104.15 Da/unit + 2 Da = 104,152 Da. The repeat unit of PP polymer is –(CH 2 –CH(CH 3))–. 5.4.3 Polypropylene. Get the detailed answer: Compute the repeat unit molecular weight of polypropylene, Compute the number-average molecular weight for a polypropylene for whi. Booster Classes. Compute the repeat unit molecular weight of polypropylene, Compute the number-average molecular weight for a polypropylene for which the degree of polymerization is 15,000. Polypropylene, a synthetic resin built up by the polymerization of propylene. (b) Compute the number-average molecular weight for a polypropylene for which the degree of polymerization is 25000. Calculate the repeat unit molecular weight of polypropylene in g/mol. M is the molecular weight of the polymer, DP is the degree of polymerization and the M 0 is the formula weight of the repeating unit. Stretching is also part of the preparation process of the commercial membrane Celgard. Your dashboard and recommendations. For polypropylene, the repeat unit molecular weight is just m = 3(A C) + 6(A H) = (3)(12.01 g/mol) + (6)(1.008 g/mol) = 42.08 g/mol And DP = M m = 33,040 g/mol 42.08 g/mol = 785 i 240 n You've reached the end of your free preview. 1) Calculation, relative number of moles of propylene glycol (PG): Locate the signal representing the methyl (CH 3) protons (ca. One of the important family of polyolefin resins, polypropylene is molded or extruded into many plastic products in which toughness, flexibility, light weight, and heat resistance are required. The Celgard membrane is made of PP, which is a low-cost and quite inert polymer. 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