Molecular orientation in poly(ethylene terephthalate) by means of laser–raman spectroscopy

Wiley - Tập 14 Số 8 - Trang 1461-1484 - 1976
John Edward Purvis1, D. I. Bower1
1Department of Physics, The University of Leeds, Leeds, England

Tóm tắt

AbstractThe intensity of the Raman scattering from uniaxially oriented amorphous poly(ethylene terephthalate) tapes at wave number shifts of 1732, 1616, 1286, 857, and 632 cm−1 has been observed for various combinations of incident and scattered light polarization vectors with respect to the draw direction. An attempt has been made to analyze the data to provide values of 〈P2(ζ)〉 and 〈P4(ζ)〉, where Pn(ζ) is the nth order Legendre polynomial in ζ,ζ is the cosine of the angle between the draw direction and a typtical chain axis in the polymer, and the angle brackets denote the average value over all repeat units. This attempt was successful for the 1616 and 632 cm−1 lines but less successful for the other three, although the data for the 1732 and 1286 cm−1 lines could be analyzed to provide quantities proportional, but not equal, to 〈P2(ζ)〉. In the analysis and discussion two possible models were considered for the conformation of the terephthaloyl residues in the amorphous polymer but it was not possible to reject either model conclusively. The results suggest, in agreement with previous studies by other methods, that the drawing of PET at 80°C takes place essentially as the extension of a rubberlike network which is frozen on subsequent cooling to room temperature.

Từ khóa


Tài liệu tham khảo

10.1016/0032-3861(73)90030-X

10.1016/0032-3861(74)90055-X

10.1002/pol.1972.180101103

10.1016/0032-3861(74)90027-5

10.1016/0032-3861(74)90126-8

10.1016/0032-3861(76)90149-X

J.Derouault M. J.Gall P. J.Hendra V.Ellis M. E. A.Cudby andH. A.Willis Proc. 2nd Europ. Symp. Polym. Spectroscopy Meet. Problems of Copolymer Statistics Milan June 15–18 1971;

1973, Quaderni Ric. Scientifica, 84, 85

10.1002/pol.1974.130120103

10.1002/pol.1974.130120801

M. A.Wilding Ph.D. Thesis Univ. of Leeds 1975.

10.1039/tf9534900433

10.1021/j150556a030

10.1039/tf9585400959

10.1007/BFb0050351

10.1016/0032-3861(69)90047-0

10.1098/rspa.1954.0273

10.1002/pol.1972.160100211

10.1016/0022-2852(59)90048-7

10.1002/pol.1973.130110703

Varsanyi G., 1969, Vibrational Spectra of Benzene Derivatives

10.1016/0584-8539(71)80086-7

F. J.Boerio private communication.

10.1016/0032-3861(74)90028-7

W. T.Wilser Ph.D. Thesis Cornell Univ. 1975.

10.1002/app.1970.070140417

10.1002/pol.1968.160060414

10.1007/978-94-010-9803-8_1

10.1088/0370-1328/80/5/319

10.1063/1.1702821