Question

5. There is a large decrease in the bulk of the rope of Nylon-6,10 upon drying. Explain this observation. 6. Using full structural formulas, draw a typical portion of a Nylon-6,6 molecule; that is, expand a portion of the formula given in Equation 22.15. Show at least two hexanedioic acid units and two 1,6-hexanediamine units. 7. Draw formulas that illustrate the hydrogen bonding that may exist between two polyamide molecules after fibers have been "cold-drawn." 8. Nylons undergo depolymerization when heated in aqueous acid. Propose a reaction mechanism that accounts for this fact, using curved arrows to symbol- ize the flow of electrons. 9. Nylon-6 is produced from caprolactam by adding a small amount of aqueous base and then heating the mixture to about 270 °C.

Answer 1

5. There is large decrease in the bulk of rope of nylon - 6, 10 upon drying because- Basically nylon 6,10 susceptible to moisture absorphón. Even during processing, it undergoes hydrolysis and changes its properties. upon drying moisture is evaporated and crystallinity increases hence bulk of rope decreases. 6. preparation of Nylon - 6, 6 :- Adipic Acid 1,6-Hexanediamine Но- с. HO--2014 au code witte De , -to .- NH (CH27 | Ho-C (CH2T & TOH HOZ C-(CH 2 2 C - NH (CH 27 NH-C-(CHAT GOH HM - (04276 NH 2 HN -Cthdy Març <Chy)<NH (CH) NIH-E (47014 Mylon 66

- N(CH2) N-c - (CH22 C- Z-Immo hydrogen bonding. - "C-(CH2) & M -(CH27 Ň - Hydrogen bonding in nylon - 6,6.

zation of Nylor ization of Nylon -6,69 HO-C-(CH27 - NH (CH276 NH Ho- Nylon 6, 6 Но - С Ho-q-(CH2 CL N1 (CH2 TG NH2 1,6-hexanediamine Hoe (Chato cott & PH (CH27 NH2 1 - H® Ho-C-(CH22 e-OH Adipic Acid.

g. preparation of Nylon-6 from caprolactum :- оне Base E-caprolactum NZHI rühs_wittet coming Clot nya EN Cont NH na tenkt alla ao Myion-
Nylon contains amide linkage hence they are called as polyamide.