An Examination of the Longitudinal Acoustic Mode of Polyethylene Crystals

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

Research output: Contribution to journalArticle

6 Citations (Scopus)

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 languageEnglish (US)
Pages (from-to)197-212
Number of pages16
JournalJournal of Macromolecular Science, Part B
Volume22
Issue number2
DOIs
StatePublished - Jan 1 1983

Fingerprint

Lattice vibrations
Polyethylene
Polyethylenes
polyethylenes
examination
Crystals
acoustics
Crystalline materials
crystals
sectors
Chain length
Elastic moduli
stems
crystal surfaces
Single crystals
modulus of elasticity
vibration
preparation
single crystals
Temperature

All Science Journal Classification (ASJC) codes

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

Cite this

Runt, James Patrick ; Harrison, I. R. ; Varnell, W. D. ; Wang, J. I. / An Examination of the Longitudinal Acoustic Mode of Polyethylene Crystals. In: Journal of Macromolecular Science, Part B. 1983 ; Vol. 22, No. 2. pp. 197-212.
@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 = "Runt, {James Patrick} and Harrison, {I. R.} and Varnell, {W. D.} and Wang, {J. I.}",
year = "1983",
month = "1",
day = "1",
doi = "10.1080/00222348308215500",
language = "English (US)",
volume = "22",
pages = "197--212",
journal = "Journal of Macromolecular Science, Part B",
issn = "0022-2348",
publisher = "Taylor and Francis Ltd.",
number = "2",

}

An Examination of the Longitudinal Acoustic Mode of Polyethylene Crystals. / Runt, James Patrick; Harrison, I. R.; Varnell, W. D.; Wang, J. I.

In: Journal of Macromolecular Science, Part B, Vol. 22, No. 2, 01.01.1983, p. 197-212.

Research output: Contribution to journalArticle

TY - JOUR

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

AU - Runt, James Patrick

AU - Harrison, I. R.

AU - Varnell, W. D.

AU - Wang, J. I.

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.

UR - http://www.scopus.com/inward/record.url?scp=0020499899&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0020499899&partnerID=8YFLogxK

U2 - 10.1080/00222348308215500

DO - 10.1080/00222348308215500

M3 - Article

AN - SCOPUS:0020499899

VL - 22

SP - 197

EP - 212

JO - Journal of Macromolecular Science, Part B

JF - Journal of Macromolecular Science, Part B

SN - 0022-2348

IS - 2

ER -