Local dynamics of atactic polypropylene across the glass transition

Valeria Arrighi; Roderick Ferguson; R E Lechner; M T F Telling; A Triolo

doi:10.1016/S0921-4526(01)00508-7

Local dynamics of atactic polypropylene across the glass transition

Valeria Arrighi, Roderick Ferguson, R E Lechner, M T F Telling, A Triolo

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16 Citations (Scopus)

Abstract

We report a dynamic investigation of the molecular processes in atactic polypropylene using quasi-elastic neutron scattering (QENS). This polymer was investigated over a wide temperature range across the glass transition temperature, T_g, using various QENS spectrometers with different energy resolutions. Below T_g, methyl side group reorientations take place. We have characterized this motion using a model that accounts for a distribution of activation energies. In the melt, where the polymer chain backbone is no longer frozen in, segmental motion occurs. QENS data analysis allows us to identify three distinct molecular processes and we present evidences for the existence of slow dynamics in the melt. © 2001 Elsevier Science B.V.

Original language	English
Pages (from-to)	35-43
Number of pages	9
Journal	Physica B: Condensed Matter
Volume	301
Issue number	1-2
DOIs	https://doi.org/10.1016/S0921-4526(01)00508-7
Publication status	Published - Jul 2001
Event	5th International Workshop on Quasi-Elastic Neutron Scattering - Edinburgh, Scotland, United Kingdom Duration: 31 Aug 2000 → …

Keywords

Atactic polypropylene
Methyl group
Quasi-elastic neutron scattering
Segmental dynamics

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10.1016/S0921-4526(01)00508-7

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title = "Local dynamics of atactic polypropylene across the glass transition",

abstract = "We report a dynamic investigation of the molecular processes in atactic polypropylene using quasi-elastic neutron scattering (QENS). This polymer was investigated over a wide temperature range across the glass transition temperature, Tg, using various QENS spectrometers with different energy resolutions. Below Tg, methyl side group reorientations take place. We have characterized this motion using a model that accounts for a distribution of activation energies. In the melt, where the polymer chain backbone is no longer frozen in, segmental motion occurs. QENS data analysis allows us to identify three distinct molecular processes and we present evidences for the existence of slow dynamics in the melt. {\textcopyright} 2001 Elsevier Science B.V.",

keywords = "Atactic polypropylene, Methyl group, Quasi-elastic neutron scattering, Segmental dynamics",

author = "Valeria Arrighi and Roderick Ferguson and Lechner, {R E} and Telling, {M T F} and A Triolo",

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T1 - Local dynamics of atactic polypropylene across the glass transition

AU - Arrighi, Valeria

AU - Ferguson, Roderick

AU - Lechner, R E

AU - Telling, M T F

AU - Triolo, A

PY - 2001/7

Y1 - 2001/7

N2 - We report a dynamic investigation of the molecular processes in atactic polypropylene using quasi-elastic neutron scattering (QENS). This polymer was investigated over a wide temperature range across the glass transition temperature, Tg, using various QENS spectrometers with different energy resolutions. Below Tg, methyl side group reorientations take place. We have characterized this motion using a model that accounts for a distribution of activation energies. In the melt, where the polymer chain backbone is no longer frozen in, segmental motion occurs. QENS data analysis allows us to identify three distinct molecular processes and we present evidences for the existence of slow dynamics in the melt. © 2001 Elsevier Science B.V.

AB - We report a dynamic investigation of the molecular processes in atactic polypropylene using quasi-elastic neutron scattering (QENS). This polymer was investigated over a wide temperature range across the glass transition temperature, Tg, using various QENS spectrometers with different energy resolutions. Below Tg, methyl side group reorientations take place. We have characterized this motion using a model that accounts for a distribution of activation energies. In the melt, where the polymer chain backbone is no longer frozen in, segmental motion occurs. QENS data analysis allows us to identify three distinct molecular processes and we present evidences for the existence of slow dynamics in the melt. © 2001 Elsevier Science B.V.

KW - Atactic polypropylene

KW - Methyl group

KW - Quasi-elastic neutron scattering

KW - Segmental dynamics

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DO - 10.1016/S0921-4526(01)00508-7

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VL - 301

SP - 35

EP - 43

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - 1-2

T2 - 5th International Workshop on Quasi-Elastic Neutron Scattering

Y2 - 31 August 2000

ER -

Local dynamics of atactic polypropylene across the glass transition

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