Quantification of non-isothermal, multi-phase crystallization of isotactic polypropylene: The influence of cooling rate and pressure

M. van Drongelen, T.B. van Erp, G.W.M. Peters

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Abstract

The structure of semi-crystalline polymers is strongly influenced by the conditions applied during processing and is of major importance for the final properties of the product. A method is presented to quantify the effect of thermal and pressure history on the isotropic and quiescent crystallization kinetics of four important structures of polypropylene, i.e. the α-, β-, γ- and mesomorphic phase. The approach is based on nucleation and growth of spherulites during non-isothermal solidification, described by the Schneider rate equations combined with the Komogoroff-Avrami expression for space filling. Using an optimization routine the time-resolved multi-phase structure development is accurately described using crystal phase dependent growth rates and an overall nucleation density, all as function of temperature and pressure. It is shown that the maximum growth rate of the α-, and γ-phase increases with applied pressure, while it decreases for the mesomorphic phase. Addition of β-nucleation agent is interpreted as a secondary nucleation density with a coupled β-phase growth. This complete crystallization kinetics characterization of isotactic polypropylene allows prediction of the multi-phase structure development for a wide range of quiescent processing conditions.
Original languageEnglish
Pages (from-to)4758-4769
Number of pages12
JournalPolymer
Volume53
Issue number21
DOIs
Publication statusPublished - 2012
Externally publishedYes

Fingerprint

Polypropylenes
Crystallization
Nucleation
Cooling
Crystallization kinetics
Phase structure
Processing
Solidification
Polymers
Crystalline materials
Crystals
Temperature

Keywords

  • Polymorphism
  • Isotactic polypropylene
  • Crystallization model

Cite this

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title = "Quantification of non-isothermal, multi-phase crystallization of isotactic polypropylene: The influence of cooling rate and pressure",
abstract = "The structure of semi-crystalline polymers is strongly influenced by the conditions applied during processing and is of major importance for the final properties of the product. A method is presented to quantify the effect of thermal and pressure history on the isotropic and quiescent crystallization kinetics of four important structures of polypropylene, i.e. the α-, β-, γ- and mesomorphic phase. The approach is based on nucleation and growth of spherulites during non-isothermal solidification, described by the Schneider rate equations combined with the Komogoroff-Avrami expression for space filling. Using an optimization routine the time-resolved multi-phase structure development is accurately described using crystal phase dependent growth rates and an overall nucleation density, all as function of temperature and pressure. It is shown that the maximum growth rate of the α-, and γ-phase increases with applied pressure, while it decreases for the mesomorphic phase. Addition of β-nucleation agent is interpreted as a secondary nucleation density with a coupled β-phase growth. This complete crystallization kinetics characterization of isotactic polypropylene allows prediction of the multi-phase structure development for a wide range of quiescent processing conditions.",
keywords = "Polymorphism, Isotactic polypropylene, Crystallization model",
author = "{van Drongelen}, M. and {van Erp}, T.B. and G.W.M. Peters",
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doi = "10.1016/j.polymer.2012.08.003",
language = "English",
volume = "53",
pages = "4758--4769",
journal = "Polymer",
issn = "0032-3861",
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Quantification of non-isothermal, multi-phase crystallization of isotactic polypropylene : The influence of cooling rate and pressure. / van Drongelen, M.; van Erp, T.B.; Peters, G.W.M.

In: Polymer, Vol. 53, No. 21, 2012, p. 4758-4769.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Quantification of non-isothermal, multi-phase crystallization of isotactic polypropylene

T2 - The influence of cooling rate and pressure

AU - van Drongelen, M.

AU - van Erp, T.B.

AU - Peters, G.W.M.

PY - 2012

Y1 - 2012

N2 - The structure of semi-crystalline polymers is strongly influenced by the conditions applied during processing and is of major importance for the final properties of the product. A method is presented to quantify the effect of thermal and pressure history on the isotropic and quiescent crystallization kinetics of four important structures of polypropylene, i.e. the α-, β-, γ- and mesomorphic phase. The approach is based on nucleation and growth of spherulites during non-isothermal solidification, described by the Schneider rate equations combined with the Komogoroff-Avrami expression for space filling. Using an optimization routine the time-resolved multi-phase structure development is accurately described using crystal phase dependent growth rates and an overall nucleation density, all as function of temperature and pressure. It is shown that the maximum growth rate of the α-, and γ-phase increases with applied pressure, while it decreases for the mesomorphic phase. Addition of β-nucleation agent is interpreted as a secondary nucleation density with a coupled β-phase growth. This complete crystallization kinetics characterization of isotactic polypropylene allows prediction of the multi-phase structure development for a wide range of quiescent processing conditions.

AB - The structure of semi-crystalline polymers is strongly influenced by the conditions applied during processing and is of major importance for the final properties of the product. A method is presented to quantify the effect of thermal and pressure history on the isotropic and quiescent crystallization kinetics of four important structures of polypropylene, i.e. the α-, β-, γ- and mesomorphic phase. The approach is based on nucleation and growth of spherulites during non-isothermal solidification, described by the Schneider rate equations combined with the Komogoroff-Avrami expression for space filling. Using an optimization routine the time-resolved multi-phase structure development is accurately described using crystal phase dependent growth rates and an overall nucleation density, all as function of temperature and pressure. It is shown that the maximum growth rate of the α-, and γ-phase increases with applied pressure, while it decreases for the mesomorphic phase. Addition of β-nucleation agent is interpreted as a secondary nucleation density with a coupled β-phase growth. This complete crystallization kinetics characterization of isotactic polypropylene allows prediction of the multi-phase structure development for a wide range of quiescent processing conditions.

KW - Polymorphism

KW - Isotactic polypropylene

KW - Crystallization model

U2 - 10.1016/j.polymer.2012.08.003

DO - 10.1016/j.polymer.2012.08.003

M3 - Article

VL - 53

SP - 4758

EP - 4769

JO - Polymer

JF - Polymer

SN - 0032-3861

IS - 21

ER -