CHM 312 Polymer Chemistry-1.pptx 2 Units

Polymer Chemistry
CHM321
2 units course

1. Polymer Chemistry CHM 312 Dr Isah S.

2. Outline Copolymerization Industrially important polymers: thermoplastic and thermosetting Polyurethanes, Rubber elasticity Mechanical properties of polymers Analysis and Testing of polymers Polymers degradation

3. Copolymerization Copolymers allow us to tailor product properties Tg Tm

4. Copolymerization: kinetics

5. Copolymerization: Kinetics Copolymerization: kinetics

6. Copolymerization: kinetics

7. Copolymerization: kinetics

8. Copolymerization: kinetics

9. Copolymerization: kinetics

10. Copolymerization: kinetics

11. Copolymerization: kinetics

12. Copolymerization: kinetics

13. Copolymerization: kinetics

14. Copolymerization:kinetics

15. Copolymerization:kinetics

16. Commercial polymers Commercially important (chain growth) examples include: Styrenics Styrene/acrylonitrile (SAN): increased impact resistance and solvent resistance; 10-40% AN, Samsonite luggage Styrene/butadiene (SBR): 25% styrene/75% butadiene Largest volume synthetic rubber (tires) HIPS: High Impact PS (PBD-g-PS) Styrene Maleic Anhydride (SMA)

17. Commercial polymers Commercially important copolymers (Cont’d) Vinyl chloride Rigid PVC: ca. 5% vinyl acetate, lowers Tg small amount allow to be processed a lower temperatures avoiding degradation Flexible: 20-40% vinyl acetate (tubing, sheets (e.g. shower curtains, etc.) Packaging: Saran Wrap® (90% vinylidene chloride)

18. Commercial polymers Commercially important copolymers (Cont’d) Ethylene (> 10 billion lbs / yr ) LDPE (homopolymer!) High pressure free radical 30-40% x- tallinity HDPE (homopolymer!) Ziegler-Natta 75% x- tallinity Linear Low Density Polyethylene Linear copolymer with 1-5 mol% α- olefins EVA: Ethylene vinyl acetate: 2-40% vinyl acetate Packaging, molding EPR: Ethylene-propylene rubber (plus cure site monomer) Ethylene/acrylic acid: (1-10 mol% AA); ionomer Surlyn ®

19. Commercial polymers Commercially important copolymers (Cont’d) Fluoropolymers PTFE: T m = 335 °C, T g = -70 °C PVDF: T m = 180 °C FEP: T m = 250 - 280 °C, T g = 70 - 120 °C ETFE: T m = 225 °C, T g = 145 °C PFA: T m = 300 °C Teflon AF: Nafion :

20. Elastomers

21. Elastomers

22. Polyurethane

23. Polyurethane Preparation

24. Polyurethane

25. Polyurethane: Preparation

26. Polyurethane Additives

27. Polyurethane Additives

28. Polyurethane

29. Rubber

30. Rubber

31. Rubber

32. Rubber

33. Rubber

34. Rubber

35. Rubber

36. Rubber

37. Rubber

38. Rubber

39. Mechanical Properties of Polymers Introduction

40. Mechanical properties: introduction cont.

41. Mechanical properties

42. Mechanical properties

43. Mechanical properties

44. Mechanical Properties

45. Mechanical properties

46. Mechanical Properties

47. Mechanical properties

48. Mechanical Properties

49. Mechanical Properties

50. Mechanical Properties

51. Polymer Degradation Introduction Generally classified into Three: Chemical degradation Thermal degradation and Photochemical degradation

52. Assignment: Chemical equation for photoinduced degradation of poly alpha-methyl styrene

53. Mechanical Properties: Polymer Degradation

54. Polymer Degradation

55. Polymer Testing and Characterization

56. Polymer Testing and Characterization

57. Polymer Testing and Characterization

58. Polymer Testing and Characterization

59. Polymer Testing and Characterization

60. Polymer Testing and Characterization