Abstract
A modification of Knox’s1 approach for the estimation of the average number of noncrystalline methylene groups per fold in polyethylene is suggested. The plot of melting point, T(l), from Thomson’s equation against inverse of crystallinity, α, from a simple model which assumes crystallinity deficiency located at the crystal surface yields a family of straight lines that can be represented by T(l)=T∞−K(1−α)/fα. T∞ is here the melting point of an infinitely thick crystal, K is a constant, and f is the average number of noncrystalline backbone units per fold contributing to the amorphous layer. Comparison of experimental data with this model shows that f depends upon crystallization conditions annealing treatment, and chain defect content (branching). The obtained results clearly indicate that f is notably smaller for single crystals than for melt-crystallized material, in agreement with previous results from Kawai.20 The discussion of f data for single crystals supports the view of a regularly folded surface layer with variable amounts of disorder. The analysis of data derived from the results of Fischer and Schmidt22 in the light of this model indicates that the annealing of crystals provokes an increase in f.
Similar content being viewed by others
Article PDF
References
J. R. Knox, J. Polym. Sci., Part C, 18, 69 (1967).
G. Adam, Kolloid Z., 180, 11 (1962).
J. B. Jackson, P. J. Flory, and R. Chiang, Trans. Faraday Soc., 49, 1906 (1963).
J. Loboda-Cackovic, H. Cackovic, and R. Hosemann, J. Polym. Sci., in press.
R. Hosemann, W. Wilke, and F. J. Baltá Calleja, Acta Cryst., 21, 118 (1966).
A. Keller, Kolloid Z., 231, 386 (1969).
A. Peterlin, J. Macromol. Sci., Phys., B 3, 11, 19 (1969).
T. Kawai, Kolloid Z., 201, 15 (1965).
K. H. Illers and H. Hendus, Makromol. Chem., 113, 1 (1968).
G. Meinel, N. Morosoff, and A. Peterlin, J. Polym. Sci., Part A-2, 8, 1723 (1970).
F. J. Baltá Calleja and A. Schönfeld, Faserforsch. Textiltech., 18, 1970 (1967).
H. G. Kilian, Kolloid Z., 176, 49 (1961).
H. Hendus and G. Schnell, Kunststoffe, 51, 69 (1961).
J. C. Gonzalez Ortega, (unpublished results).
G. J. Davies, R. K. Eby, and G. M. Martin, J. Appl. Phys., 39, 4973 (1968).
D. R. Rueda, A. Hidalgo, and F. J. Baltá Calleja, Paper presented at the 16th Meeting of the “Real Soc. Esp. Fís. Quím.”, Oviedo, Spain, Sept., 1973.
F. J. Baltá Calleja and A. Hidalgo, Kolloid Z., 229, 21 (1969).
K. Tanaka, Bull. Chem. Soc. Jpn., 33, 1060 (1960).
A. Nakajima and S. Hayashi, Kolloid Z., 225, 116 (1968).
T. Kawai, K. Ujihara, and H. Maeda, Makromol. Chem., 132, 87 (1970).
T. Kawai, Makromol. Chem., 90, 288 (1966).
E. W. Fischer and G. F. Schmidt, Angew. Chem., 74, 551 (1962).
T. Kawai, T. Goto, and H. Maeda, Kolloid Z., 223, 117 (1968).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Baltá Calleja, F., Rueda, D. Study of the Interlamellar Folded Structure of Polyethylene as Revealed by Melting Point and Crystallinity. Polym J 6, 216–221 (1974). https://doi.org/10.1295/polymj.6.216
Issue Date:
DOI: https://doi.org/10.1295/polymj.6.216
Keywords
This article is cited by
-
Study of blends based on recycled polyethylene wastes
Journal of Materials Science (1996)
-
Comprehensive thermal analysis of random copolymers of ethylene and 1-olefins
Journal of Thermal Analysis (1992)
-
Dependence of micro-indentation hardness on the superstructure of polyethylene
Colloid and Polymer Science (1976)