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ss_4 - 5.1 One can typically strengthen a thermoplastic...

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Unformatted text preview: 5.1. One can typically strengthen a thermoplastic polymer by (check all that apply): (9 __ decreasing M“. @ Jincreasingthedegme ofbranching @ if adding bulky sidegroups ® -/ increasing the ratio of crystalline to amorphous polymer 6? 1/ adding polar side groups 5.3. The boiling temperatures of methane (CH4), carbon tetrachloride (0014), and water (1120) are 111 K, 350 K, and 373 K, respectively. For each of these three molecules: a) make a 2-d sketch the structure of the molecule; b) calculate the percent ionicity of the 0-11; 0-01, and 0-H bonds c) develop a brief argument justifying the magnitudes and general order of boiling temperatures for these three molecules. LL C\ (-1 l t l exp-Cw“ O-C'CA O l ‘ \H v C‘ 1 _ .s‘ % \opxtmi: 8-— WRQMQ Lek egg» ea; 2 2:. 3‘0 cw. 0.03% A» 3.9% em '/ ED : as" DU u em -=-2 72 2:: 6‘5- 2‘ 0m aw: % W ° MOI.“ fikb‘c‘e‘rfi. \JO \ WVWTM 0e. me We?“ name w \8 P kavmhmg \«eL’FL'CnUt. Mb WE; veer-me. Mb WUE W 5::— W meDutS duo mm. a.“ 5.9. (A) The monomer unit for poly(propylene) is given in the diagram below. Ifthe average molecular weight of a sample of poly(propylene) is 58,000 g/mole, what is the degree of polymerization of the average poly(propylene) molecule? (B) Do all poly(propylene) molecules in the sample have this degree of polymerization? Briefly justify your answer. (C) Draw a sketch illustmting the confonnation of a typical poly(propylene) molecule in this sample. -— ~ WMRR mmfl“ \5 capflewdé> M {We Van-1' 55? W gymfififi. [_________4 5.15. 13 the glass transition temperature of an elastic band above or below room temperature? Briefly justify your answer. W mmwxaa. M“ vow W\ W $®$ W: 0% REleEE. NS .mmms "NINE? W1, WLR‘LOKES END §W avgsmmmw owning. WPu‘Eb 863638, N Emma» 1S R>£amm>mw meant. Hams: o:- W. cwmw' mLqus. wwzp 560% k W. Exwuk‘rb W: mews wmwc’r‘wp meat‘ M W em: munch game Mb 3mm 61591 Lemma. ...
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