The vibrational spectrum of polyethylene—III. Polarized Raman spectra of “single crystal texture” polyethylene and a single crystal of C23H48

Hendra, P.J.; Jobic, H.; Marsden, E.; Bloor, D.

doi:10.1016/0584-8539(77)80054-8

Cited by 57 publications

(29 citation statements)

References 19 publications

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“…Since this vibration is observed because of correlation splitting, only those chain units present in an orthorhombic lattice (2 chains per unit cell) will participate in the scattering at this frequency. It was shown [7] that the intensity of this band is independent of temperature and that there is no significant occurrence of Fermi resonance at this frequency as has been sometimes proposed [4,8]. The K 402 1416 cm -1 band thus can provide an accurate measurement of the amount of crystallinity and complements other methods.…”

mentioning

confidence: 89%

“…However, a large body of evidence unequivocally indicates that the origin of the 1416 cm -~ band is the Ag component of the CH 2 bending vibration split by the crystal field [1][2][3]. The band at 1440 cm -1 has been partly assigned to the other component of this vibration, (Big) [1][2][3][4]5]. A detailed study of this bending mode region [2,3,6] has led to the assignment of the 1400 cm -1 and 1460 cm -1 bands to bending vibrational modes occurring in what has been termed a "semiordered" solid amorphous phase and a "liquid-like" *) Dedicated to Prof. Dr. F. H. M~iller solid amorphous phase respectively.…”

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confidence: 99%

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A Raman spectroscopic study of the morphological structure of the polyethylenes

Glotin

Mandelkern

1982

Colloid & Polymer Sci

182

107

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Abstract:The method described by Strobl and Hagedorn to analyze the Raman spectrum internal modes of semi-crystalline polyethylene has been applied to a set of selected polyethylene samples crystallized under controlled conditions. The crystallite structure can be described in terms of the relative amounts of the crystalline orthorhombic phase, the liquid-like amorphous phase and the interracial region. The dependence of the level of crystallinity on molecular weight and crystallization conditions is very similar to that found by other methods. However, this method allows for the quantitative determination of the interfacial content which becomes significant for molecular weights greater than about 1 • 10 5 for linear polyethylene fractions, and for all the branched samples and copolymers. The degree of crystallinity determined from density measurements is equal to the sum of the crystallinity and interfacial content obtained from the Raman analysis while enthalpy of fusion measurements yield values which are equal to just the crystallinity content. The difference between the level of crystallinity obtained from density and enthalpy of fusion is thus found to be primarily due to interfacial contributions.

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mentioning

confidence: 89%

mentioning

confidence: 99%

A Raman spectroscopic study of the morphological structure of the polyethylenes

Glotin

Mandelkern

1982

Colloid & Polymer Sci

182

107

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“…Other peaks ͑1462 and 1472 cm Ϫ1 -bending, 1175 cm Ϫ1 -wagging, 720 and 730 cm Ϫ1 -rocking modes͒ are weak. Bending and rocking peaks in highly crystalline bulk PE 23 and in highly oriented orthorhombic PE bulk films 24 are much sharper than in the LB film, and disappear above the melting point. 25 Bands near 1360 cm Ϫ1 may come from the GG, GTG, and GTTG defects.…”

Section: Ir Spectroscopymentioning

confidence: 99%

“…2͑a͒. Strong peaks at 2920 and 2850 cm Ϫ1 correspond to asymmetrical and symmetrical CH 2 stretching modes, 22,23 respectively. Other peaks ͑1462 and 1472 cm Ϫ1 -bending, 1175 cm Ϫ1 -wagging, 720 and 730 cm Ϫ1 -rocking modes͒ are weak.…”

Section: Ir Spectroscopymentioning

confidence: 99%

Langmuir–Blodgett films of polyethylene

Sorokin

Bai

Ducharme

et al. 2002

Journal of Applied Physics

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The possibility to obtain surface layers on water and prepare solid multilayer Langmuir-Blodgett films of medium-density polyethylene is shown. The polymer film on water is stable, demonstrates a reversible surface pressure-area isotherm up to 15 mN/m, and can be deposited onto a substrate using the Langmuir-Blodgett technique in a wide range of surface pressures. The thickness of a single deposited layer is 5.1 nm on average. The dielectric and optical constants of multilayer films are near their bulk values. The films exhibit high dielectric strength of at least 200 MV/m.

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“…Les raies Raman situées à 1 418,1 440 et 1 460 cm -1 ont reçu des attributions différentes, souvent contradictoires : vibration de balancement (wagging) des groupements CH2 pour la raie à 1 418 cm-1 [3][4][5], modes provenant du dédoublement par couplage intermoléculaire de la vibration de déformation angulaire b(CH2) pour les raies à 1418 et 1 440 cm-1 [6], modes issus de l'interaction, avec résonance de Fermi, des vibrations b(CH2) avec les harmoniques des vibra-tions de rotation plane (rocking) p(CH2) pour les raies à 1418, 1 440 et 1 460 cm-1 [l, 7,8]. Ces différentes hypothèses ne font intervenir que les vibrations de la phase cristalline et ne peuvent expliquer de façon satisfaisante les spectres du P.E.…”

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Etude des modes Raman de déformation angulaire des CH2 dans le polyéthylène

Vinh¹,

Abénoza²,

Rault³

1979

J. Phys. France

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2014 L'étude des spectres Raman d'échantillons de polyéthylène semi-cristallins ayant des cristallinités et des taux d'orientation différents conduit à une nouvelle attribution des raies de fréquence 1 440 et 1 460 cm-1. Cette attribution fait intervenir les vibrations de déformation angulaire des groupements CH2 de la phase amorphe et permet d'expliquer les différences existant entre le spectre Raman du polyéthylène fondu et celui de la phase amorphe du matériau semi-cristallin. On montre également que dans le polyéthylène ultra-étiré, la phase amorphe s'oriente perpendiculairement à la direction d'étirement, ce qui est compatible avec la présence de repliements et de défauts de Pechhold (kinks) qui ne donnent pas lieu à une désorientation des chaînes cristallines. Abstract. 2014 Raman studies were carried out in the 1 400-1 500 cm-1 région on polyethylene samples of various crystallinities and différent stretching ratios. These studies lead to a new assignment of the 1 440 and 1 460 Raman bands to bending modes of amorphous phase CH2 groups which allows us to explain the différence between the Raman spectrum of the polyethylene melt and that of the amorphous phase of semicrystalline samples. Polarization effects in stretched polyethylene Raman spectra show that the amorphous chains are oriented perpendicular to the stretching direction, this is explained by the présence in this material of sharp folds and Pechhold defects (kinks) which involve no disorientation of the crystalline chains.

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The vibrational spectrum of polyethylene—III. Polarized Raman spectra of “single crystal texture” polyethylene and a single crystal of C23H48

Cited by 57 publications

References 19 publications

A Raman spectroscopic study of the morphological structure of the polyethylenes

A Raman spectroscopic study of the morphological structure of the polyethylenes

Langmuir–Blodgett films of polyethylene

Etude des modes Raman de déformation angulaire des CH2 dans le polyéthylène

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