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Scattering Studies of Cyrstallization in Highly Oriented Polymers

Published online by Cambridge University Press:  26 February 2011

J. M. Schultz
J. M. Schultz*
Affiliation:
University of Delaware, Dept. of Chemical Engineering and Materials Graduate Program, Newark, DE 19716
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The solidification of low molecular weight materials from their melts (in the absence of temperature fields) generally leads to a product with no preferred orientation, independent of the extent or rate of deformation of the melt. The solidification of polymers from a highly deformed melt or solution nearly always leads to a product with preferred molecular orientation. Further, the rate of solidification can be significantly increased by melt deformation. The change in rate, relative to that in a quiescent melt or solution, can be several orders of magnitude [1]. These differences, relative to small-molecule systems, arise from the degree to which orientation and local strain can be maintained in the melt. Due to the long-range connectivity within a polymer molecule, it is possible to impart large extensions to these molecules in the molten state, and significant time is often required for the molecules to relax back to their undistorted, coiled state. If crystallization or glass formation occurs before the chain can relax, an extended molecular configuration can be retained. Thus in the solidification of oriented polymers there exists a competition between the “freezing” of the molecular orientation and the relaxation (re-coiling) of the molecules.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 79: Symposium F – Scattering, Deformation and Fracture in Polymers , 1986 , 215
Copyright
Copyright © Materials Research Society 1987

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References

1. Tiller, William A. and Schultz, J.M., J. Polymer Sci., Polym. Phys. Ed. 22, 143 (1984).CrossRefGoogle Scholar
2. Meakin, P. and Scallopino, D.J., J. Polymer Sci., Polym. Phys. Ed. 23, 179 (1985).CrossRefGoogle Scholar
3. Petermann, J. and Gohil, R.M., J. Mater. Sci. 14, 2260 (1979).CrossRefGoogle Scholar
4. Schultz, J.M. and Petermann, J., Colloid & Polym. Sci. 262, 294 (1984).CrossRefGoogle Scholar
5. Petermann, J., Gohil, R.M., Schultz, J.M., Hendricks, R.W., Schultz, J.M., J. Polymer Sci. 20, 523 (1982).Google Scholar
6. Hendricks, R.W., J. Appl. Cryst. 11, 15 (1978).CrossRefGoogle Scholar
7. Petermann, J., Makromol. Chem. 182, 613 91981).CrossRefGoogle Scholar
8. Gunther, R.-H., PhD dissertation, Universität Mainz, 1981.Google Scholar
9. Peszkin, Perla N. and Schultz, J.M., J. Appl. Polym. Sci. 30, 2689 (1985).CrossRefGoogle Scholar
10. Peszkin, Perla N. and Schultz, J.M., J. Polymer Sci., Polym. Phys. Ed., in press.Google Scholar
11. Dismore, P.F. and Statton, W.O., J. Polymer Sci., Polym. Symposia 13C, 133 (1966).CrossRefGoogle Scholar
12. Fischer, E.W., Pure Appl. Chem. 50, 1319 (1978).CrossRefGoogle Scholar
13. Stamm, M., Fischer, E.W., Dettenmaier, M., Convert, P., Faraday Discuss. Chem. Soc. 68, 263 (1979).CrossRefGoogle Scholar
14. McAlea, K.L., PhD dissertation, University of Delaware, 1985.Google Scholar
15. Elad, J. and Schultz, J.M., J. Polymer Sci., Polym. Phys. Ed. 22, 781 (1984).CrossRefGoogle Scholar
16. Petermann, J. and Schultz, J., J. Mater. Sci. 13, 2188 (1978).CrossRefGoogle Scholar
17. Babajko, Suzanne and Schultz, J.M., J. Polymer Sci., Polym. Phys. Ed. 20, 497 (1982).CrossRefGoogle Scholar
18. Cahn, J.W., Trans. Metall. Soc. AIME 166, 242 (1968).Google Scholar
19. Gupte, K.M., Motz, Heike, Schultz, J.M., J. Polymer Sci., Polym. Phys. Ed. 21, 1927 (1983).CrossRefGoogle Scholar