STRUCTURE OF DRAWN POLYMERS.

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Abstract:

Morphology of deformed single crystals and chain mobility of cold drawn samples of polyethylene, polyoxymethylene and polycaprolactam were investigated by electron microscopy, electron diffraction and nuclear magnetic resonance. Due to the good and uniform adherence of solution grown single crystals of PE on the polyethylene terephathalate substrate, the study of small deformation ratios revealed the details of twinning, phase transformation, chain tilting and slip as functions of crystal orientation and temperature. In order to observe an intermediate case between single crystals and bulk polymers, the deformation of extremely thin polyethylene spherulites was also investigated. The morphology changes at small deformations were very similar to those with single crystals. Nuclear magnetic resonance investigation of cold drawn polyethylene and polyoxymethylene first revealed the marked anisotropy characteristic of the nearly complete uniaxial orientation. Moreover, in polyethylene an intermediate component was observed.

Author(s):
Peterlin, A.
Author Organization(s):
RESEARCH TRIANGLE INST DURHAM N C
Descriptive Note:
Rept for 1 Apr 63-31 Jul 64,
Annotation:
Structure of drawn polymers.
Pagination:
0270

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFML-TR-64-351
Contract/Grant Number(s):
AF33 657 11070
Task Number(s):
734202
Project Number(s):
AF-7342
Monitor Series:
TR-64-351
 Subject Terms
Joint Capability Areas:
JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*SYNTHETIC FIBERS, *ACETAL RESINS, *NYLON, *POLYMERS, CRYSTAL DEFECTS, DEFORMATION, DRAWING(FORMING)
Report Date:
1964 Dec 01