EFFECT OF INTERLAMELLAR FORCES ON THE LONGITUDINAL ACOUSTIC MODE OF POLYETHYLENE CRYSTALS.

J. Runt, B. D. Hanrahan, I. R. Harrison

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In the reported experiments, the fold periods and longitudinal acoustic modes (LAMs) for isothermally crystallized polyethylene (PE) single crystals were determined in the dried state and in the presence of decalin and silicone oil. Upon swelling with decalin, the fold period increased by 7% while the LAM peak frequency decreased by approximately 1 cm** minus **1. Several possible explanations for the change in LAM frequency are discussed but the exact interpretation is open to question. No change in fold period was observed upon soaking a dried crystal mat in silicone oil. This fold period invariance along with the fact that silicone oil has no effect on the melting point of PE crystals indicates that there is no significant interaction between the oil and the methylene groups on the crystal surface. It is shown that the LAM peak frequency for crystals suspended in silicone oil is the same as that for the dried crystals, indicating that interlamellar forces do not exert a significant perturbing influence on the LAM of polyethylene crystals.

Original languageEnglish (US)
Pages (from-to)1687-1693
Number of pages7
JournalJournal of polymer science. Part A-2, Polymer physics
Volume20
Issue number9
StatePublished - Sep 1 1982

Fingerprint

Lattice vibrations
Polyethylenes
Silicones
Crystals
Invariance
Swelling
Melting point
Oils
Single crystals
Experiments

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

@article{fc47d4284a8846089c880b8486cc5d90,
title = "EFFECT OF INTERLAMELLAR FORCES ON THE LONGITUDINAL ACOUSTIC MODE OF POLYETHYLENE CRYSTALS.",
abstract = "In the reported experiments, the fold periods and longitudinal acoustic modes (LAMs) for isothermally crystallized polyethylene (PE) single crystals were determined in the dried state and in the presence of decalin and silicone oil. Upon swelling with decalin, the fold period increased by 7{\%} while the LAM peak frequency decreased by approximately 1 cm** minus **1. Several possible explanations for the change in LAM frequency are discussed but the exact interpretation is open to question. No change in fold period was observed upon soaking a dried crystal mat in silicone oil. This fold period invariance along with the fact that silicone oil has no effect on the melting point of PE crystals indicates that there is no significant interaction between the oil and the methylene groups on the crystal surface. It is shown that the LAM peak frequency for crystals suspended in silicone oil is the same as that for the dried crystals, indicating that interlamellar forces do not exert a significant perturbing influence on the LAM of polyethylene crystals.",
author = "J. Runt and Hanrahan, {B. D.} and Harrison, {I. R.}",
year = "1982",
month = "9",
day = "1",
language = "English (US)",
volume = "20",
pages = "1687--1693",
journal = "Journal of polymer science. Part A-2, Polymer physics",
issn = "0449-2978",
publisher = "Interscience Publishers",
number = "9",

}

EFFECT OF INTERLAMELLAR FORCES ON THE LONGITUDINAL ACOUSTIC MODE OF POLYETHYLENE CRYSTALS. / Runt, J.; Hanrahan, B. D.; Harrison, I. R.

In: Journal of polymer science. Part A-2, Polymer physics, Vol. 20, No. 9, 01.09.1982, p. 1687-1693.

Research output: Contribution to journalArticle

TY - JOUR

T1 - EFFECT OF INTERLAMELLAR FORCES ON THE LONGITUDINAL ACOUSTIC MODE OF POLYETHYLENE CRYSTALS.

AU - Runt, J.

AU - Hanrahan, B. D.

AU - Harrison, I. R.

PY - 1982/9/1

Y1 - 1982/9/1

N2 - In the reported experiments, the fold periods and longitudinal acoustic modes (LAMs) for isothermally crystallized polyethylene (PE) single crystals were determined in the dried state and in the presence of decalin and silicone oil. Upon swelling with decalin, the fold period increased by 7% while the LAM peak frequency decreased by approximately 1 cm** minus **1. Several possible explanations for the change in LAM frequency are discussed but the exact interpretation is open to question. No change in fold period was observed upon soaking a dried crystal mat in silicone oil. This fold period invariance along with the fact that silicone oil has no effect on the melting point of PE crystals indicates that there is no significant interaction between the oil and the methylene groups on the crystal surface. It is shown that the LAM peak frequency for crystals suspended in silicone oil is the same as that for the dried crystals, indicating that interlamellar forces do not exert a significant perturbing influence on the LAM of polyethylene crystals.

AB - In the reported experiments, the fold periods and longitudinal acoustic modes (LAMs) for isothermally crystallized polyethylene (PE) single crystals were determined in the dried state and in the presence of decalin and silicone oil. Upon swelling with decalin, the fold period increased by 7% while the LAM peak frequency decreased by approximately 1 cm** minus **1. Several possible explanations for the change in LAM frequency are discussed but the exact interpretation is open to question. No change in fold period was observed upon soaking a dried crystal mat in silicone oil. This fold period invariance along with the fact that silicone oil has no effect on the melting point of PE crystals indicates that there is no significant interaction between the oil and the methylene groups on the crystal surface. It is shown that the LAM peak frequency for crystals suspended in silicone oil is the same as that for the dried crystals, indicating that interlamellar forces do not exert a significant perturbing influence on the LAM of polyethylene crystals.

UR - http://www.scopus.com/inward/record.url?scp=4243359519&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4243359519&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:4243359519

VL - 20

SP - 1687

EP - 1693

JO - Journal of polymer science. Part A-2, Polymer physics

JF - Journal of polymer science. Part A-2, Polymer physics

SN - 0449-2978

IS - 9

ER -