It is resistant to extreme pH conditions and is insoluble in most solvents at room temperature. For polypropylene the repeat unit is the propylene monomer. The repeat unit of PP polymer is –(CH 2 –CH(CH 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. 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. Get the detailed answer: Compute the repeat unit molecular weight of polypropylene, Compute the number-average molecular weight for a polypropylene for whi. 1.0 ppm) MW = 1,000 units x 104.15 Da/unit + 2 Da = 104,152 Da. 5.4.3 Polypropylene. Your dashboard and recommendations. The basic concepts of molecular weight, molecular weight distribution and MFI are explained below. Calculate the repeat unit molecular weight of polypropylene in g/mol. Molecular weight (MW) A polymer (poly = many) is made up of many repeated units of a monomer (mono = one). Stretching is also part of the preparation process of the commercial membrane Celgard. Polypropylene, a synthetic resin built up by the polymerization of propylene. 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. (b) Compute the number-average molecular weight for a polypropylene for which the degree of polymerization is 25000. 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. 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. Switch to. 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. (a) Compute the repeat unit molecular weight of polypropylene. This is a broad statement and may confuse more than explain. 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. Polypropylene glycol (minimum molecular weight 150) is an indirect food additive for use only as a component of adhesives. We are asked to compute the degree of polymerization for polypropylene, given that the number-average molecular weight is 1,000,000 g/mol. Atomic weights for several elements are included in the following table: 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. 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