Molecular weight (MW) A polymer (poly = many) is made up of many repeated units of a monomer (mono = one). Polypropylene glycol (minimum molecular weight 150) is an indirect food additive for use only as a component of adhesives. Stretching is also part of the preparation process of the commercial membrane Celgard. 1.0 ppm) 21 CFR 175.105 (USFDA); U.S. National Archives and Records Administration's Electronic Code of Federal Regulations. 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. 1) Calculation, relative number of moles of propylene glycol (PG): Locate the signal representing the methyl (CH 3) protons (ca. (b) Compute the number-average molecular weight for a polypropylene for which the degree of polymerization is 25000. For polypropylene the repeat unit is the propylene monomer. Click here to access Table 14.3. The repeat unit of PP polymer is –(CH 2 –CH(CH 3))–. Switch to. Calculate the repeat unit molecular weight of polypropylene in 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. The basic concepts of molecular weight, molecular weight distribution and MFI are explained below. (a) Compute the repeat unit molecular weight of polypropylene. It is resistant to extreme pH conditions and is insoluble in most solvents at room temperature. 5.4.3 Polypropylene. Your dashboard and recommendations. This is a broad statement and may confuse more than explain. The Celgard membrane is made of PP, which is a low-cost and quite inert polymer. Home. We are asked to compute the degree of polymerization for polypropylene, given that the number-average molecular weight is 1,000,000 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. 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. 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. Booster Classes. 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. 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. 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