An Examination of the Longitudinal Acoustic Mode of Polyethylene Crystals

J. Runt; I. R. Harrison; W. D. Varnell; J. I. Wang

doi:10.1080/00222348308215500

An Examination of the Longitudinal Acoustic Mode of Polyethylene Crystals

J. Runt, I. R. Harrison, W. D. Varnell, J. I. Wang

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Abstract

Chain lengths have been calculated from the peak positions of the longitudinal acoustic modes (LAM) of polyethylene single crystals grown at several different temperatures. The data are consistent with other experimental results when the crystalline elastic modulus is taken to be 3.6 ˣ 10¹²dyn/cm². How-ever, this is true only if the vibrations of the crystalline chain segments are unaffected by the presence of folds and cilia on the crystal surface. The LAMs of several crystal preparations were also deconvoluted with the first-order LAM of C₉₄H₁₉₀in order to remove instrumental broadening. The band shapes of the deconvoluted spectra are consistent with the idea that the LAM of polyethylene crystals is composed of two contributions : one due to chain stems in 110 sectors and a second due to chains in 200 sectors.

Original language	English (US)
Pages (from-to)	197-212
Number of pages	16
Journal	Journal of Macromolecular Science, Part B
Volume	22
Issue number	2
DOIs	https://doi.org/10.1080/00222348308215500
State	Published - Jan 1 1983

All Science Journal Classification (ASJC) codes

Chemistry(all)
Condensed Matter Physics
Polymers and Plastics
Materials Chemistry

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@article{b8219e3126074032b53ee8af5a52d298,

title = "An Examination of the Longitudinal Acoustic Mode of Polyethylene Crystals",

abstract = "Chain lengths have been calculated from the peak positions of the longitudinal acoustic modes (LAM) of polyethylene single crystals grown at several different temperatures. The data are consistent with other experimental results when the crystalline elastic modulus is taken to be 3.6 ˣ 1012dyn/cm2. How-ever, this is true only if the vibrations of the crystalline chain segments are unaffected by the presence of folds and cilia on the crystal surface. The LAMs of several crystal preparations were also deconvoluted with the first-order LAM of C94H190in order to remove instrumental broadening. The band shapes of the deconvoluted spectra are consistent with the idea that the LAM of polyethylene crystals is composed of two contributions : one due to chain stems in 110 sectors and a second due to chains in 200 sectors.",

author = "J. Runt and Harrison, {I. R.} and Varnell, {W. D.} and Wang, {J. I.}",

note = "Funding Information: The authors would like to thank the NSF Polymer Program for support of this work through grant numbers DMR- 75-01254A01 and 78-25233. We would also like to thank Dr. Robert Snyder for supplying us with the C 94 H 190 and Dr. John Rabolt for obtaining the low-temperature Raman spectra. This work was first presented at the March meeting of the American Physical Society (Chicago, Ill.) in 1979.",

year = "1983",

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doi = "10.1080/00222348308215500",

language = "English (US)",

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T1 - An Examination of the Longitudinal Acoustic Mode of Polyethylene Crystals

AU - Runt, J.

AU - Harrison, I. R.

AU - Varnell, W. D.

AU - Wang, J. I.

N1 - Funding Information: The authors would like to thank the NSF Polymer Program for support of this work through grant numbers DMR- 75-01254A01 and 78-25233. We would also like to thank Dr. Robert Snyder for supplying us with the C 94 H 190 and Dr. John Rabolt for obtaining the low-temperature Raman spectra. This work was first presented at the March meeting of the American Physical Society (Chicago, Ill.) in 1979.

PY - 1983/1/1

Y1 - 1983/1/1

N2 - Chain lengths have been calculated from the peak positions of the longitudinal acoustic modes (LAM) of polyethylene single crystals grown at several different temperatures. The data are consistent with other experimental results when the crystalline elastic modulus is taken to be 3.6 ˣ 1012dyn/cm2. How-ever, this is true only if the vibrations of the crystalline chain segments are unaffected by the presence of folds and cilia on the crystal surface. The LAMs of several crystal preparations were also deconvoluted with the first-order LAM of C94H190in order to remove instrumental broadening. The band shapes of the deconvoluted spectra are consistent with the idea that the LAM of polyethylene crystals is composed of two contributions : one due to chain stems in 110 sectors and a second due to chains in 200 sectors.

AB - Chain lengths have been calculated from the peak positions of the longitudinal acoustic modes (LAM) of polyethylene single crystals grown at several different temperatures. The data are consistent with other experimental results when the crystalline elastic modulus is taken to be 3.6 ˣ 1012dyn/cm2. How-ever, this is true only if the vibrations of the crystalline chain segments are unaffected by the presence of folds and cilia on the crystal surface. The LAMs of several crystal preparations were also deconvoluted with the first-order LAM of C94H190in order to remove instrumental broadening. The band shapes of the deconvoluted spectra are consistent with the idea that the LAM of polyethylene crystals is composed of two contributions : one due to chain stems in 110 sectors and a second due to chains in 200 sectors.

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JO - Journal of Macromolecular Science, Part B

JF - Journal of Macromolecular Science, Part B

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ER -

An Examination of the Longitudinal Acoustic Mode of Polyethylene Crystals

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