The repeat unit of PP polymer is –(CH 2 –CH(CH 3))–. (a) Compute the repeat unit molecular weight of polypropylene. We are asked to compute the degree of polymerization for polypropylene, given that the number-average molecular weight is 1,000,000 g/mol. This is a broad statement and may confuse more than explain. Molecular weight (MW) A polymer (poly = many) is made up of many repeated units of a monomer (mono = one). 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. 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. The Celgard membrane is made of PP, which is a low-cost and quite inert polymer. Polypropylene, a synthetic resin built up by the polymerization of propylene. Click here to access Table 14.3. 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. 1.0 ppm) Switch to. (b) Compute the number-average molecular weight for a polypropylene for which the degree of polymerization is 25000. Polypropylene glycol (minimum molecular weight 150) is an indirect food additive for use only as a component of adhesives. 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. Atomic weights for several elements are included in the following table: Stretching is also part of the preparation process of the commercial membrane Celgard. It is resistant to extreme pH conditions and is insoluble in most solvents at room temperature. 21 CFR 175.105 (USFDA); U.S. National Archives and Records Administration's Electronic Code of Federal Regulations. The basic concepts of molecular weight, molecular weight distribution and MFI are explained below. 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. 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. Calculate the repeat unit molecular weight of polypropylene in g/mol. Booster Classes. 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. 1) Calculation, relative number of moles of propylene glycol (PG): Locate the signal representing the methyl (CH 3) protons (ca. Home. MW = 1,000 units x 104.15 Da/unit + 2 Da = 104,152 Da. 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. For polypropylene the repeat unit is the propylene monomer. Your dashboard and recommendations. 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.
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