Structure of 22,12-polyurethane in chain-folded lamellar crystals

Macromolecules

Volumn 35, Issue 22, 2002, Pages 8433-8439

  McKiernan, Robin L ^a   Sikorski, Pawel ^b   Atkins, Edward D T ^b   Gido, Samuel P ^a   Penelle, Jacques ^a  

^a UNIVERSITY OF MASSACHUSETTS   (United States)

^b UNIVERSITY OF BRISTOL   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

LAMELLAR CRYSTALS;

COMPUTER SIMULATION; CRYSTALLIZATION; CRYSTALS; ELECTRON MICROSCOPY; FITS AND TOLERANCES; MOLECULAR DYNAMICS; MOLECULAR STRUCTURE; X RAY DIFFRACTION ANALYSIS;

POLYURETHANES;

EID: 0037159269     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma020739o     Document Type: Article

References (21)

1. McKiernan, R.L.; Gido, S.P.; Penelle, J. Polymer 2002, 43, 3007.
2. Heintz, A.M.; McKiernan, R.L.; Gido, S.P.; Penelle, J.; Hsu, S.L. Macromolecules 2002, 35, 3117.
3. McKiernan, R.L.; Heintz, A.M.; Hsu, S.L.; Atkins, E.D.T.; Penelle, J.; Gido, S.P. Macromolecules 2002, 35, 6970.
4. McKiernan, R.L.; Cardoen, G.; Boutevin, B.; Améduri, B.; Gido, S.P.; Penelle, J. Submitted to Macromol. Chem. Phys. In this particular contribution, hetroatom segments were inserted into the polyurethane backbone.
5. The term syncephlic signifies head-to-head, tail-to-tail polymerization; thus, the resulting polymer has no polarity with respect to chain direction. In this sense, these molecules relate to, for example, the even-even nylon family.
6. For fibers: Bunn, C.W.; Garner, E.V. Proc. R. Soc. London, Part A 1947, 189, 39.
7. For chain-folded lamellar crystals of nylon 6 6: Atkins, E.D.T.; Keller, A.; Sadler, D.M. J. Polym. Sci. A 1972, 2, 863. For examples of other even-even nylons see refs 8-11.
8. Atkins, E.D.T.; Hill, M.J.; Hong, S.K.; Keller, A.; Organ, S. Macromolecules 1992, 25, 917.
9. Jones, N.A.; Atkins, E.D.T.; Hill, M.J. J. Polym. Sci., Polym. Phys. 2000, 38, 1209.
10. Jones, N.A.; Atkins, E.D.T.; Hill, M.J.; Cooper, S.J.; Franco, L. Macromolecules 1997, 30, 3569.
11. Atkins, E.D.T.; Hill, M.J.; Jones, N.A.; Cooper, S.J. J. Polym. Sci., Polym. Phys. 1998, 36, 2401.
12. Geil, P.H. Polymer Single Crystals; Interscience: New York, 1963.
13. Keller, A. Prog. Phys. 1968, 31, 41.
14. Le Fevere de ten Hove, C.; Jones, A.; Penelle, J. Submitted to Macromolecules.
15. This value can be modified later as part of the refinement process.
16. The value of 44.3° for the tilt angle is dependent on the value chosen for c, and therefore might alter slightly in the refinement process. The direction of tilt, with respect to the unit cell axes, will be determined by the structural model proposed.
17. Atkins, E.D.T.; Hill, M.J.; Jones, N.A.; Sikorski, P. J. Mater. Sci. 2000, 35, 5179.
18. Sikorski, P.; Atkins, E.D.T. Macromolecules 2001, 34, 4788.
19. A 0.42 nm diffraction signal in nylons is often associated with a pseudohexagonal phase being present, e.g. ref 9.
20. 2 bonds (170, 170°) is compensated for by an increase in the van der Waals interaction energy due to better chain packing. In general, the shortening of the chain may not be a consequence of the conformation preferred by an isolated chain but instead may be influenced by packing of chains, especially of the long alkane segments.
21. Magill, J.H.; Girolamo, M.; Keller, A. Polymer 1981, 22, 43.