A scattering study of nucleation phenomena in polymer crystallisation

A J  Ryan; J P A  Fairclough; N J  Terrill; P D  Olmstead; Wilson Poon

doi:10.1039/A900246D

A scattering study of nucleation phenomena in polymer crystallisation

A J Ryan, J P A Fairclough, N J Terrill, P D Olmstead, Wilson Poon

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

The mechanism of primary nucleation in polymer crystallisation has been investigated experimentally and theoretically. Two types of experiments have been performed on polypropylene, polyethylene, and poly(ethylene terpthalate). Crystallisations with long induction times, studied by small and wide angle X-ray scattering (SAXS and WAXS), reveal the onset of large scale ordering prior to crystal growth. Rapid crystallisations studied by melt extrusion indicate the development of well resolved oriented SAXS patterns associated with large scale order before the development of crystalline peaks in the WAXS region. The results suggest pre-nucleation density fluctuations play an integral role in polymer crystallisation. A theoretical model has been developed which qualitatively describes the experimental results.

Original language	English
Pages (from-to)	13-29
Number of pages	17
Journal	Faraday Discussions
Issue number	112
DOIs	https://doi.org/10.1039/A900246D
Publication status	Published - 1999

Keywords

X-RAY-SCATTERING
DENSITY-FLUCTUATIONS
SPINODAL DECOMPOSITION
CRYSTAL NUCLEATION
INDUCTION PERIOD
ISOTACTIC POLYPROPYLENE
SYNCHROTRON-RADIATION
STRUCTURAL FORMATION
SMALL-ANGLE
CRYSTALLIZATION

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title = "A scattering study of nucleation phenomena in polymer crystallisation",

abstract = "The mechanism of primary nucleation in polymer crystallisation has been investigated experimentally and theoretically. Two types of experiments have been performed on polypropylene, polyethylene, and poly(ethylene terpthalate). Crystallisations with long induction times, studied by small and wide angle X-ray scattering (SAXS and WAXS), reveal the onset of large scale ordering prior to crystal growth. Rapid crystallisations studied by melt extrusion indicate the development of well resolved oriented SAXS patterns associated with large scale order before the development of crystalline peaks in the WAXS region. The results suggest pre-nucleation density fluctuations play an integral role in polymer crystallisation. A theoretical model has been developed which qualitatively describes the experimental results.",

keywords = "X-RAY-SCATTERING, DENSITY-FLUCTUATIONS, SPINODAL DECOMPOSITION, CRYSTAL NUCLEATION, INDUCTION PERIOD, ISOTACTIC POLYPROPYLENE, SYNCHROTRON-RADIATION, STRUCTURAL FORMATION, SMALL-ANGLE, CRYSTALLIZATION",

author = "Ryan, {A J} and Fairclough, {J P A} and Terrill, {N J} and Olmstead, {P D} and Wilson Poon",

year = "1999",

doi = "10.1039/A900246D",

language = "English",

pages = "13--29",

journal = "Faraday Discussions",

issn = "1359-6640",

publisher = "Royal Society of Chemistry",

number = "112",

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TY - JOUR

T1 - A scattering study of nucleation phenomena in polymer crystallisation

AU - Ryan, A J

AU - Fairclough, J P A

AU - Terrill, N J

AU - Olmstead, P D

AU - Poon, Wilson

PY - 1999

Y1 - 1999

N2 - The mechanism of primary nucleation in polymer crystallisation has been investigated experimentally and theoretically. Two types of experiments have been performed on polypropylene, polyethylene, and poly(ethylene terpthalate). Crystallisations with long induction times, studied by small and wide angle X-ray scattering (SAXS and WAXS), reveal the onset of large scale ordering prior to crystal growth. Rapid crystallisations studied by melt extrusion indicate the development of well resolved oriented SAXS patterns associated with large scale order before the development of crystalline peaks in the WAXS region. The results suggest pre-nucleation density fluctuations play an integral role in polymer crystallisation. A theoretical model has been developed which qualitatively describes the experimental results.

AB - The mechanism of primary nucleation in polymer crystallisation has been investigated experimentally and theoretically. Two types of experiments have been performed on polypropylene, polyethylene, and poly(ethylene terpthalate). Crystallisations with long induction times, studied by small and wide angle X-ray scattering (SAXS and WAXS), reveal the onset of large scale ordering prior to crystal growth. Rapid crystallisations studied by melt extrusion indicate the development of well resolved oriented SAXS patterns associated with large scale order before the development of crystalline peaks in the WAXS region. The results suggest pre-nucleation density fluctuations play an integral role in polymer crystallisation. A theoretical model has been developed which qualitatively describes the experimental results.

KW - X-RAY-SCATTERING

KW - DENSITY-FLUCTUATIONS

KW - SPINODAL DECOMPOSITION

KW - CRYSTAL NUCLEATION

KW - INDUCTION PERIOD

KW - ISOTACTIC POLYPROPYLENE

KW - SYNCHROTRON-RADIATION

KW - STRUCTURAL FORMATION

KW - SMALL-ANGLE

KW - CRYSTALLIZATION

U2 - 10.1039/A900246D

DO - 10.1039/A900246D

M3 - Article

SP - 13

EP - 29

JO - Faraday Discussions

JF - Faraday Discussions

SN - 1359-6640

IS - 112

ER -

A scattering study of nucleation phenomena in polymer crystallisation

Abstract

Keywords

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