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quiz8spr01 - ~ o~ Quiz 8 ENSC 3313 Spring 2001 Answer 1 any...

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~, o~ Quiz 8 ENSC 3313, Spring 2001 Name Answer any 4 Questions onlv, 1 point each I would presume that polymonof1uorodichloroethylene could be a commercial polymer. Sketch the mer of such a polymer and tell the degree of polymerization for a molecular weight of 50,000. The Amu are F = 19, Cl = 35.5, C = 12, H = 1. 1 The basis in polyethylene, (C2~)n, one H has been replaced by F and 2 by Cl, hence The MW is 2 x 12 + 1 x 1 + 2 x 35.5 + 1 x 19 = 115 1. Hence, DP = 50,000 = 435 115 An initiator, dibenzoyl peroxide, is added to 600 kg of ethylene, C2~, prior to polymerization. The average degree of polymerization was 1100. Assuming that the initiator was 70% efficient in fomling temlinal groups for the polymer molecules, how many grams were added? The di-BP fomlula is (C~5CO)202. 2 Mol. Wt. MerWt. MW 28 DP= 1100 = MW = 30,800 We need 1 peroxide unit per molecule, (C~5CO)O O(C~5CO) Hence w/o peroxide needed is 246 100 -1.14% x- 30,800 0.7 We have 600 kg of PE Hence need -6846 9 6.85 kg or Why? Polytrifluorochloroethylene can be a-, syndio-, Tacticity is irrelevant in polytetrafluoroethylene.
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