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Fractionation and Characterisation of Propylene-Ethylene Random Copolymers: Effect of the Comonomer on Crystallisation of Poly(propylene) in the γ-Phase

Gareth W. Harding

Department of Chemistry and Polymer Science, University of Stellenbosch, Private Bag X1, 7602, Stellenbosch, South Africa

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Albert J. van Reenen,

Corresponding Author

Albert J. van Reenen

[email protected]

Department of Chemistry and Polymer Science, University of Stellenbosch, Private Bag X1, 7602, Stellenbosch, South Africa

Department of Chemistry and Polymer Science, University of Stellenbosch, Private Bag X1, 7602, Stellenbosch, South Africa. Fax: +27-21-808-4967Search for more papers by this author

Gareth W. Harding,

Gareth W. Harding

Department of Chemistry and Polymer Science, University of Stellenbosch, Private Bag X1, 7602, Stellenbosch, South Africa

Search for more papers by this author

Albert J. van Reenen,

Corresponding Author

Albert J. van Reenen

[email protected]

Department of Chemistry and Polymer Science, University of Stellenbosch, Private Bag X1, 7602, Stellenbosch, South Africa

Department of Chemistry and Polymer Science, University of Stellenbosch, Private Bag X1, 7602, Stellenbosch, South Africa. Fax: +27-21-808-4967Search for more papers by this author

First published: 21 September 2006

https://doi.org/10.1002/macp.200600242

Citations: 26

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Abstract

Summary: Three propylene-ethylene random copolymers, of varying ethylene content, were fractionated using preparative TREF. The TREF fractions were subsequently analysed offline by CRYSTAF, DSC, ¹³C NMR spectroscopy, HT-GPC, and WAXD. The effect of the ethylene comonomer on the crystallisability of the propylene was investigated, along with the effect of the comonomer on the type of crystal phase formed during the crystallisation. The results show that the comonomer inhibits the crystallisation of the copolymer and that as the ethylene content increases, the crystallisation and melting points decrease. It was also shown that the higher the ethylene content, the more of the γ-phase crystal type is formed. The inter-molecular distribution of the ethylene comonomer and stereo errors vary between the samples analysed, and this accounts for the relative differences in crystallisation behaviour of the samples.

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Volume207, Issue18

September 22, 2006

Pages 1680-1690

Fractionation and Characterisation of Propylene-Ethylene Random Copolymers: Effect of the Comonomer on Crystallisation of Poly(propylene) in the γ-Phase

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Fractionation and Characterisation of Propylene-Ethylene Random Copolymers: Effect of the Comonomer on Crystallisation of Poly(propylene) in the γ-Phase

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