CHM4272_Exam 1_Key

CHM4272_Exam 1_Key - CHM 4272 9 7 Exam #1, Spring 2011...

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Unformatted text preview: CHM 4272 9 7 Exam #1, Spring 2011 name, ID # l. (25 points) Give the monomers required to form the following polymers, or the polymers which form from the reaction of the given monomers. Classify the polymerizations as to whether they are step— growth, chain growth, or ring—opening. Classify the polas to whether they are condensation or addition types. n m» V (a) C1403” H—(l):(13:H —» CRAC\1)Ruv-\ (b) {e’ttaf’ [I Cahdi"$v~‘*\<r- \10 points) X—ray diffraction, colligative properties (osmotic pressure), and solution viscosity present three experimental methods that were invaluable in establishing the Macromolecular Hypothesis by about 1930. Pick one of these methods and describe how the results obtained from that experiment confirmed the hypothesis. (my ~ .- \’ A gin-$47 Via 6» Co\\§3c’¥" F‘ii6J/i‘7‘ A5 mkcvame\*' Cy‘v) d; hu“ d'x1)o€§L—le 61“ \‘9‘1" (*“Ce‘jfi‘q'gs‘w‘3 ) ~e$6tlt;c_\\7 \JV" \Ia\v\¢; D‘k’ m (-3f~(£ll—‘\-c w\‘\\- we.\gm) 0% W4\J¢\~L’) k mdb Lu‘ 4' hsL 3. (10 points) Similar to polybenzimidazoles, the polyaramide Kevlar can have its solubility properties drastically changed via pendant group derivitization. Fill in the boxes to give the appropriate structures to complete the polymer synthesis. Put Repeat Unit Structure For Kevtar Hene Describe the solubility property differences between the polymer as-made in this polymerization and after the functionalization reaction. (For fun in the filture, see Macromolecules 1990, 23 , 3118-3124.) A; Wade ’ {*th) Lu\(‘/ “2/ ¥unckowul§14A -— w vb, (15 points) p—Aminobenzoic acid [H2N-(C6H4)—C02H] is polymerized such that 99.00% of each .unctional group is converted into amide linking groups. Calculate the number average degree of polymerization (Xn), the number average molecular weight (Mn), and the weight average molecular weight (MW) assuming a polydispersity index of 2.0. (Show all of your work in as logical a manner as possible below. Circle the three final answers.) u ‘3 “.6 ,‘q 0. OH C7 HgHO ’3 llcl sly-m) EMQ X - “is” , ML :100 I lwg 1 010‘ WM“ 3 MO X“ ’/ l\,0\°o Sincé‘ ma : 7V1 mm 1 232800 5 Zr») 5. (10 points) Short answers. a. A crosslinked polymer can only be processed by melt methods (like extrusion) since it is completely insoluble. Circle True oEal/s; b. In a network polymerization of melamine [C3N3—(NH2)6] with formaldehyde, give the functionality of melamine. ' é v c. The reaction of a carboxylic acid chloride with an amine proceed slower (circle one), than the reaction of an ester with an amine. ” e. The recycling of polymers and e a highly successful or ,- 4' . (15 pts.) Using chemical reactions and brief comments, outline the synthesis of Nylon 66, using adipic acid [HOZC-(CH2)4—COZH] and hexamethylene diamine (H2N—(CH2)6-NH2] as monomers, Via a method that ensures stoichiometric balance. HOZC(CHQQCQ~L\A (t n,» (mqux-t, wax, + yuczph’a i {QCV7\I\9\\;1< “A3” .. 01¢ (c“,i\flCOL- 1 fl 413w-“ lAz): (CHLW t. Hfil’r i A Ycre‘” “6“” a L rho 2(9ch 15cm 0 IA 1’ ’ WA ’}~\\/\/\/\}_\ It H20 IE \ ) h 0 H 7. (15 pts.) Give chemical reactions for the initiation, propagation, and termination Via disproportionation for the polymerization of acrylic acid (structure given below) initiated by a H202/Fe2+ redox initiator system. H acrylic acid= HZC = Ci COZH :Q/ r 2’» c: a.» 3% 0’» HLQ‘L av Ye “>7 RC). ‘\ HQ +¥e§ 4“: Mac 1} :\ W7 - fa?“ MiG/«Ni C° 1M . "‘ ‘ Xv Mil/NW k h 2:\ ‘ “a. 13206;)“ Cetu “Lu ‘9‘“? he " 607,»: C‘QLR ...
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CHM4272_Exam 1_Key - CHM 4272 9 7 Exam #1, Spring 2011...

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