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Rigidity of heat‐treated oriented isotactic polypropylene
Author(s) -
Tsobkallo Katherina,
Tikhomirov A.,
Bozdogan A.,
Tshmel A.
Publication year - 2006
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.25010
Subject(s) - tacticity , materials science , composite material , annealing (glass) , tangent modulus , raman spectroscopy , dissipation factor , polypropylene , tangent , moduli , modulus , rigidity (electromagnetism) , polymer , polymerization , mathematics , optics , dielectric , physics , geometry , optoelectronics , quantum mechanics
Abstract Uniaxially oriented commercial films of isotactic polypropylene were strained with ends keeping fixed and subjected to the heat treatment at temperatures from 50 to 200°C. The rigidity of annealed samples was characterized by the value of tangent modulus, E t , determined graphically at the initial portions of stress–strain curves. The structural changes in the samples were studied with the help of the IR and low‐frequency Raman spectroscopies. The smallest E t values were obtained for the low‐strained films, while the tangent moduli measured for highly strained samples exceeded the value for the original (untreated) film. The most prominent positive effect was achieved after annealing the samples at 90°C. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 6074–6080, 2006