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. 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. Get the detailed answer: Compute the repeat unit molecular weight of polypropylene, Compute the number-average molecular weight for a polypropylene for whi. For polypropylene the repeat unit is the propylene monomer. 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. Atomic weights for several elements are included in the following table: Polypropylene, a synthetic resin built up by the polymerization of propylene. 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))–. The Celgard membrane is made of PP, which is a low-cost and quite inert polymer. Molecular weight (MW) A polymer (poly = many) is made up of many repeated units of a monomer (mono = one). 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. Switch to. Home. Click here to access Table 14.3. 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. This is a broad statement and may confuse more than explain. Your dashboard and recommendations. We are asked to compute the degree of polymerization for polypropylene, given that the number-average molecular weight is 1,000,000 g/mol. 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. Stretching is also part of the preparation process of the commercial membrane Celgard. 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. 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. Booster Classes. 1.0 ppm) (a) Compute the repeat unit molecular weight of polypropylene. 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. 1) Calculation, relative number of moles of propylene glycol (PG): Locate the signal representing the methyl (CH 3) protons (ca. 5.4.3 Polypropylene. 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