Effects of pre-annealing on the uni- and bi-axial stretching behavior of poly(ethylene naphthalate) films

Effect of pre-annealing on stress and birefringence behavior of poly(ethylene naphthalate) (PEN) films during stretching and relaxation processes was investigated. Amorphous and non-oriented PEN films were pre-annealed under the conditions of different temperatures and periods. The pre-annealed film...

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Bibliographic Details
Main Authors: Abe, T, Takarada, W, Kikutani, T
Format: Conference Proceeding
Language:English
Subjects:
AMORPHOUS STATE
ANNEALING
BIREFRINGENCE
COMPARATIVE EVALUATIONS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Diffraction patterns
ETHYLENE
NAPHTHALENE
Necking
ORGANIC POLYMERS
ORIENTATION
Polyethylene naphthalate
REFRACTIVE INDEX
Refractivity
RELAXATION
STRESSES
Stretching
TEMPERATURE DEPENDENCE
VARIATIONS
X-RAY DIFFRACTION
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Summary:Effect of pre-annealing on stress and birefringence behavior of poly(ethylene naphthalate) (PEN) films during stretching and relaxation processes was investigated. Amorphous and non-oriented PEN films were pre-annealed under the conditions of different temperatures and periods. The pre-annealed films were stretched uniaxially or equi-biaxially and then relaxed at fixed length. It was found that pre-annealing did not cause any notable change for the initial behavior of refractive indices variation, whereas the behaviors after necking were significantly affected. Through the comparison between in-plane and out-of-plane birefringence and the analysis of wide-angle x-ray diffraction patterns of drawn films of both stretching modes, it was confirmed that the orientation of naphthalene ring in the film plane was enhanced by pre-annealing.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4873736