Anisotropy of IR absorption of an extruded polyethylene terephthalate film

Stas’kov, N. I.; Golovachev, V. I.; Gusev, S. A.

doi:10.1016/0032-3950(77)90346-x

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…This band, which has been assigned to a complex mode of C-C chain stretching, CH3 rocking, and CH bending, is known to be sensitive to crystallinity (or helix length) since its intensity becomes quite weak in melt.8™10 It is a combination band even though much of its contribution comes from the crystalline phase.11 This band is observed to exhibit parallel dichroism when uniaxially oriented,12™14 so it is expected that the dichroic ratio, kx/ky, defined as above would give values greater than one as a function of increasing uniaxial draw ratio. Indeed, Figure 4 shows that the dichroic ratio kz/ky increases from about 1 to about 4 with the draw ratio. Furthermore, within experimental error, the surface has similar orientation to the bulk.…”

Section: Resultsmentioning

confidence: 97%

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Modified technique for measurement of orientation from polymer surfaces by attenuated total reflection infrared dichroism

Sung¹

1981

Macromolecules

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For example: U.S. Patents 4 140 529 and 4 141 729. US. Patents 4 116 862 and 4 145 536. O'Reilly, J. M.; Mosher, R. A.; Goffe, W. L. Photogr. Sci. Eng. Tanda, M., et al. Photogr. Sci. Eng. 1979,23, 290-6. Law, K. Y.; Vincett, P. S.; Loutfy, R. 0.; Alexandru, L.; Hopper, M. A.; Sharp, J. H.; Johnson, G. E.ABSTRACT: For a sensitive measurement of surface molecular orientation by attenuated total reflection (ATR) IR dichroism, a modified sample holder was developed, utilizing a symmetrical, double-edged internal reflection crystal. This modified sample holder allows the sample to be rotated without the disassembling and reasembling operations which change the contact area between the polymer and the ATR crystal. Therefore correction of the reflectivities to an internal standard absorption band which is insensitive to orientation is not necessary with this modified apparatus. This was tested on two types of polypropylene. Results with uniaxially drawn polypropylene show that the surface orientation is similar to the bulk, as expected. On the other hand, the orientation as measured by this technique was greater on the surface than in the core of an injection-molded polypropylene plate, a tendency confirmed by birefringence. This technique can be used for estimating bulk orientation of a thick sample without sectioning when the surface has similar orientation to the bulk. In cases where the surface differs significantly in orientation from the bulk, our technique should provide a surface-sensitive estimation of orientation, since the surface probed is only about 1 pm in this technique.

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Section: Resultsmentioning

confidence: 97%

“…Figure4. Dichroic ratio, kz/ky, at 1168 cm 1 as a function of uniaxial draw ratio for polypropylene drawn at either 25 or 150 °C.…”

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confidence: 99%

Modified technique for measurement of orientation from polymer surfaces by attenuated total reflection infrared dichroism

Sung¹

1981

Macromolecules

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“…Spontaneous orientation on the surface of polyamide acid films occurred simultaneously with the imidization of the films to form the polyimides at higher temperatures. Stas'kov et al (98) were able to determine a preferential orientation of backbone axes along the direction normal to the film surface of extruded poly( ethylene terephthalate). In addition, there appeared to be higher crystallinity within the bulk polymer as compared to the surface regions of the e~truded samples.…”

Section: Surface Orientationmentioning

confidence: 99%

Surface Infrared Spectroscopy

Knutson

Lyman

1985

Surface and Interfacial Aspects of Biomedical Polymers

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“…The most popular method is used to measure only the s-polarized spectra at optimal angles of incidence and three orientations of the orthogonal axes x, y, and z of the film with respect to the incidence plane [1]. However, to obtain the corresponding components R x s , R y s , and R z s of the dichroic spectra in this way [2], one has to simulate identical experimental conditions for investigating three different samples of one and the same polymer object [3]. The most effective method for studying anisotropic materials seems to be the use of both polarizations.…”

Section: Introductionmentioning

confidence: 99%

Optical characteristics of uniaxial polyester films with the optical axis perpendicular to the surface

Ivashkevich

Stas’kov

2005

J Appl Spectrosc

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The functions of the main indices of refraction n(ν) and absorption κ(ν) of uniaxial thin polyethylene terephthalate films have been calculated by the experimental spectra of frustrated total reflection of s-and p-polarized radiation in the 700-760-cm −1 range. The κ o (ν) maximum falls at the the 727-cm −1 frequency and the maximum of κ e (ν) falls at the the 724-and 732-cm −1 frequencies.

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Anisotropy of IR absorption of an extruded polyethylene terephthalate film

Cited by 5 publications

References 6 publications

Modified technique for measurement of orientation from polymer surfaces by attenuated total reflection infrared dichroism

Modified technique for measurement of orientation from polymer surfaces by attenuated total reflection infrared dichroism

Surface Infrared Spectroscopy

Optical characteristics of uniaxial polyester films with the optical axis perpendicular to the surface

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