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Chain Folding in Polyethylene and Cyclic Paraffins

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2 Author(s)
Newman, B.A. ; Rutgers‐The State University, New Brunswick, New Jersey ; Kay, H.F.

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With a view to a study of fold configurations, the crystal and molecular structure of a large cyclic paraffin (CH2)34 was determined by x-ray diffraction. Three-dimensional data were collected and the structure refined using a structure-factor least-squares computer program. The standard deviations in the final carbon atom coordinates were 0.02 Å. The configuration of the molecule was that of a ``collapsed'' ring, with two parallel linear chains linked by two terminal carbon atoms at either end. The chains packed together to give a triclinic subcell with dimensions a=4.246  Å α=6030′ b=5.470  Å β=7408′ c=2.564  Å γ=9647′. Restraints imposed by the fold configuration gave rise to a departure from optimum packing of the chains at some distance from the fold. A rough estimate of the surface free energy of polymer faces containing similar folds was made.

Published in:

Journal of Applied Physics  (Volume:38 ,  Issue: 11 )

Date of Publication:

Oct 1967

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