Synthesis, photodegradation, and energy transfer in a series of poly(ethylene terephthalate–<i>co</i>–2,6‐naphthalenedicarboxylate) copolymers

Cheung, Ping-Sun Ralph; Roberts, Carleton W.; Wagener, Kenneth B.

doi:10.1002/app.1979.070240804

Cited by 32 publications

(26 citation statements)

References 47 publications

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“…With As for the polarization ratio, the value = 2.3 3 in the improved model is much smaller than that (! 11 /fj_ = 5.0 8 ) in the case of the perfect crystal model but rather close to that (f 11 /Jj_ =2.1 2 ) in the case of eq 16. This is reasonable since the perfect crystal is too far away from the actual state of the PET film.…”

Section: Oscillator Strength Obtained From Reflection Spectrasupporting

confidence: 69%

“…The bands at 341 nm and 358 nm were found as fluorescence excitation bands in PET films at room temperature 5 and in fibers at low temperature. 8 In the present study, the excitation spectrum revealed a maximum at 343 nm and three shoulders at 279 nm and 315 nm and possibly at 358 nm, as shown in Figure 9. Therefore, the weak absorption structures at 341 nm and 358 nm are linked to the excitation peak at 343 nm and to the broad shoulder at 358 nm.…”

Section: Polarized Absorption Spectrasupporting

confidence: 66%

“…2 • 3 The third absorption band corresponds to that of the solution spectrum reported by Cheung et a/. 8 and also to those of DMT. 5 1.4 To examine the first absorption band in more detail, films of about I J.tm thick were necessary.…”

Section: Polarized Absorption Spectramentioning

confidence: 53%

“…Also, the solution spectra of PET in hexafiuoro-2-propanol reported by Cheung et a/. 8 revealed bands at 291, 245 and 191 nm. So far, a possible n-->n* band has not been found in any of PET solution spectra.…”

mentioning

confidence: 80%

“…(8) where 2 is the wavelength of incident light. The absorption spectra calculated from eq 8 are shown in Figure 14.…”

Section: K(w)=-k(w)mentioning

confidence: 99%

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Anisotropic Absorption and Reflection Spectra of Poly(ethylene terephthalate) Films in Ultraviolet Region

Ouchi

1983

Polym J

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ABSTRACT:Thin uniaxially drawn poly( ethylene terephthalate) films (down to 0.1 flm thickness) were prepared. Their absorption spectra showed clear dichroism having peaks at 300 (.l), 243 (/ /) and 197 nm (/ 1). Analysis of the reflection spectra of thick films by means of the Kramers-Kronig conversion gave absorption spectra almost identical with those obtained from direct absorption measurement. Spectral shapes and possible origins of the vibrational structures were qualitatively discussed. The oscillator strength of each band was obtained on the simple oriented gas model with or without the Lorentz field correction to examine effects of molecular aggregation. PPP calculations with CI were made by use of a model compound, and four 1 A•-> 1 Bu allowed transitions were predicted to occur at 4.66, 5.27, 6.33 and 6.44eV. The latter two transitions were actually observed at 6.2eV. The calculated transition moments suggested the existence of the cis form of carbonyl groups in oriented amorphous phases.

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Section: Oscillator Strength Obtained From Reflection Spectrasupporting

confidence: 69%

Section: Polarized Absorption Spectrasupporting

confidence: 66%

Section: Polarized Absorption Spectramentioning

confidence: 53%

mentioning

confidence: 80%

“…(8) where 2 is the wavelength of incident light. The absorption spectra calculated from eq 8 are shown in Figure 14.…”

Section: K(w)=-k(w)mentioning

confidence: 99%

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Anisotropic Absorption and Reflection Spectra of Poly(ethylene terephthalate) Films in Ultraviolet Region

Ouchi

1983

Polym J

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Excitation and emission spectra of polyethylene terephthalate and polyethylene 2,6-naphthalate films

Ouchi¹,

Miyamura²,

Sakaguchi³

et al. 1999

Polym. Adv. Technol.

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With excitation by the light of the wavelengths longer than 320 nm, fluorescence spectra of polyethylene terephthalate (PET) films had somewhat different shapes from those excited below 300 nm through the intrinsic absorption of PET molecules. Also, in the measurements taken with a polarizer in front of the receiving monochoromator but none before the sample, the intensity ratio of parallel (to the draw axis of the film) and perpendicular components of the emission spectra was different if excited above 320 nm or below 300 nm. Discussion was made about the first step of pumping photon energy at the wavelengths above 320 nm. Fluorescence spectra of polyethylene 2,6‐naphthalate films showed a mirror image of their absorption spectra, consisting of one broad band having the same polarization as their absorption spectra. Their fluorescence occurred from the lowest excited level, conforming to the Kasha law. Copyright © 1999 John Wiley & Sons, Ltd.

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Novel copolyesters containing naphthalene structure III. Copolyesters prepared from 2,6‐dimethyl naphthalate, ethylene glycol, and 2,2‐dialkyl‐1,3‐propanediols

Sun

Liu

2001

J of Applied Polymer Sci

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Poly(ethylene naphthalate) (PEN) copolymers were prepared by melt polycondensation of dimethyl naphthalate and excess ethylene glycol with 5-40 mol % (in feed) of 1,3-propanediol or 2,2-dialkyl-1,3-propanediols, where the dialkyl groups are dimethyl, diethyl, and butyl-ethyl. No significant depression of reduced specific viscosity was observed. The comonomer contents in the copolymers are considerably higher than those in the feed. The effects of the copolymer composition on the structures of the films were investigated using thermal analyses, density measurements, X-ray diffraction methods, and other physical tests. The crystallinities and densities of heat-treated films decreased with increasing content of comonomer and length of alkyl side chain in the comonomer. The glass transition temperature (T g ) and melting temperature (T m ) were decreased by the copolymerization, while an increase in the length of the alkyl side chain hardly affected T m s of the heat-treated films. Alkali resistance, moisture resistance, dye ability, and thermal shrinkage were increased by the incorporation of comonomer having an alkyl side chain.

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Synthesis, photodegradation, and energy transfer in a series of poly(ethylene terephthalate–co–2,6‐naphthalenedicarboxylate) copolymers

Cited by 32 publications

References 47 publications

Anisotropic Absorption and Reflection Spectra of Poly(ethylene terephthalate) Films in Ultraviolet Region

Anisotropic Absorption and Reflection Spectra of Poly(ethylene terephthalate) Films in Ultraviolet Region

Excitation and emission spectra of polyethylene terephthalate and polyethylene 2,6-naphthalate films

Novel copolyesters containing naphthalene structure III. Copolyesters prepared from 2,6‐dimethyl naphthalate, ethylene glycol, and 2,2‐dialkyl‐1,3‐propanediols

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