Q1. Calculate the number average degree of polymerization of equimolar mixture of adipic acid and hexamethylene diamine for extents of reaction 0.500, 0.800, 0.900, 0.970.
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- Q1: Clarify the differences between the cationic and anionic polymerization in propagation step. Q2: What is the function of catalyst in coordination polymerization? Q3: Explain briefly the classifications of step growth polymerization.6. The polymerization between equimolar amounts of a diol and diacid proceeds with an equilibrium constant of 200. What will be the expected degree of polymerization and extent of reaction if the reaction is carried out in a closed system without removal of the by-product water? To what level must [H2O] be lowered in order to obtain a degree of polymerization of 200 if the initial concentration of carboyxl groups is 2 M?Network phenol-formaldehyde; linear and heavily crosslinked cis-isoprene State whether it is possible to determine whether one polymer is more likely to crystallize than the other. If it is possible, note which is the more likely and then cite reason(s) for your choice. If it is not possible to decide, state why.
- 5. Which of the following "isomeric" polymers would you expect to exhibit the greater crystallinity? Explain. Chemical Structure and Polymer Morphology 8. Which of the following "isomeric" polymers would you expect to exhibit the greater crystallinity? Expl (a) CH₂CH₂CH- CH₂CH or OCH [EICH, EOCH.CHCH₂Of 9. When poly(tetramethylene adipate) (a polymer of interest for at crinity initially increases surgical sutures) i jected to hydrolytic or enzymatic degradation, the polymer's percent does this suggest about the degradation process? (A.-C. Albertson and O. Ljunquist, J. Macromo Chem., A23, 393, 1986) (b) CH, [ECH). COCH, Jon Of CH₂ (c) -CH₂CF₂ or or -CHFCHF- 10. One method of determining percent crystallinity in a polymer involves inverse gas chromatograph is, the polymer in question is used as the stationary liquid phase coated on the column packing. SpWhich illustrates a random co-polymer? а. b. wan d.H (CH,), nylon 6 C- - N-- H I| | (CH), — с—N— (CH)2 H -N- nylon 6,12 n What is the mole fraction of polymer chains possessing a degree of polymerization of 100 in the product mixture?
- Calculate the number-average degree of polymerization of an equimolar mixture of adipic acid and hexamethylene diamine for the reaction conversion of 0.500, 0.800,0.900, 0.950, 0.970, 0.099, 0.995.7 Provide a concise explanation for why, in the case of polymerisation shown below where the monomer conversions are high, the polydispersity values of the polymer produced will s are exceed 1. H2N. `NH2 2 HCI foreAn amionic polymerization is proceded in tetrahydrofuran and 1,4-dioxane, respecively. Anionic inititos (RLi" and R'K) comprising lithium or potassium ion as counterions are respectively utlized in each solvent system. Please compare their rate constants for propagation (k,3), and rationalize your answer. (10%)
- By measuring molecular weight as a function of monomer conversion, describe how youcan tell whether the polymerization of an unknown monomer was proceeding by a stepgrowth or chain-growth mechanism.In a non-acid catalyzed step-growth polymerization between A-A and B-B monomers, the A groups are titratable by aqueous base (1 N) and [A-A] [B-B) = 6 mol.kg-1. a) What is the DP if it takes 100 mL of base to neutralize the reaction mixture at 700 minutes of reaction time (assuming the initial total weight 500 g)?...Q) The monomer 1 can be polymerised via ring opening metathesis polymerisation. 1 By varying the monomer to catalyst ratio, it is possible to control the degree of polymerisation of the resulting polymer. Explain why.