Properties of polypropylene copolymer-mica composites

Shucai Li, Pentti Järvelä, Pirkko Järvelä

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

Abstract

Crystallisation behaviour, morphology, dynamic mechanical, and mechanical properties have been studied for polypropylene copolymer (PP)-mica composites at various mica concentrations. Both treated and untreated mica significantly increased the modulus and improved the tensile and bending strength of the composites. Dynamic mechanical analysis indicates that the composites possess higher stiffness over a broad temperature range. Conversely, addition of both types of mica results in a deterioration of the notched impact strength. The reinforcing effect of the treated mica to the PP appears to be better than that of the untreated mica, whereas the impact properties of PP-treated mica and PP-untreated mica composites are similar at the same composition. According to morphological and crystallisation observations for the composites, the enhanced modulus, tensile, and bending strength can be attributed to alignment and orientation of the mica in the flow direction during injection moulding. The low impact strength of both composites results from the role of mica as a stress concentrator and also to the change in the microstructure of the matrix because of the nucleating effect of both types of mica on PP. By correlating the dynamic mechanical and mechanical properties to the morphology for both composites, the mica treated with a silane coupling agent enhances interfacial interaction with PP to a certain extent, compared with untreated mica.
Original languageEnglish
Pages (from-to)441-447
Number of pages7
JournalPlastics, Rubber and Composites Processing and Applications
Volume25
Issue number9
Publication statusPublished - 1996
MoE publication typeA1 Journal article-refereed

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Polypropylenes
Mica
Copolymers
Composite materials
Impact strength
Crystallization
Bending strength
mica
Tensile strength
Silanes
Mechanical properties
Coupling agents
Dynamic mechanical analysis
Injection molding
Deterioration

Cite this

Li, Shucai ; Järvelä, Pentti ; Järvelä, Pirkko. / Properties of polypropylene copolymer-mica composites. In: Plastics, Rubber and Composites Processing and Applications. 1996 ; Vol. 25, No. 9. pp. 441-447.
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title = "Properties of polypropylene copolymer-mica composites",
abstract = "Crystallisation behaviour, morphology, dynamic mechanical, and mechanical properties have been studied for polypropylene copolymer (PP)-mica composites at various mica concentrations. Both treated and untreated mica significantly increased the modulus and improved the tensile and bending strength of the composites. Dynamic mechanical analysis indicates that the composites possess higher stiffness over a broad temperature range. Conversely, addition of both types of mica results in a deterioration of the notched impact strength. The reinforcing effect of the treated mica to the PP appears to be better than that of the untreated mica, whereas the impact properties of PP-treated mica and PP-untreated mica composites are similar at the same composition. According to morphological and crystallisation observations for the composites, the enhanced modulus, tensile, and bending strength can be attributed to alignment and orientation of the mica in the flow direction during injection moulding. The low impact strength of both composites results from the role of mica as a stress concentrator and also to the change in the microstructure of the matrix because of the nucleating effect of both types of mica on PP. By correlating the dynamic mechanical and mechanical properties to the morphology for both composites, the mica treated with a silane coupling agent enhances interfacial interaction with PP to a certain extent, compared with untreated mica.",
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Li, S, Järvelä, P & Järvelä, P 1996, 'Properties of polypropylene copolymer-mica composites', Plastics, Rubber and Composites Processing and Applications, vol. 25, no. 9, pp. 441-447.

Properties of polypropylene copolymer-mica composites. / Li, Shucai; Järvelä, Pentti; Järvelä, Pirkko.

In: Plastics, Rubber and Composites Processing and Applications, Vol. 25, No. 9, 1996, p. 441-447.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Properties of polypropylene copolymer-mica composites

AU - Li, Shucai

AU - Järvelä, Pentti

AU - Järvelä, Pirkko

N1 - Project code: KET4216

PY - 1996

Y1 - 1996

N2 - Crystallisation behaviour, morphology, dynamic mechanical, and mechanical properties have been studied for polypropylene copolymer (PP)-mica composites at various mica concentrations. Both treated and untreated mica significantly increased the modulus and improved the tensile and bending strength of the composites. Dynamic mechanical analysis indicates that the composites possess higher stiffness over a broad temperature range. Conversely, addition of both types of mica results in a deterioration of the notched impact strength. The reinforcing effect of the treated mica to the PP appears to be better than that of the untreated mica, whereas the impact properties of PP-treated mica and PP-untreated mica composites are similar at the same composition. According to morphological and crystallisation observations for the composites, the enhanced modulus, tensile, and bending strength can be attributed to alignment and orientation of the mica in the flow direction during injection moulding. The low impact strength of both composites results from the role of mica as a stress concentrator and also to the change in the microstructure of the matrix because of the nucleating effect of both types of mica on PP. By correlating the dynamic mechanical and mechanical properties to the morphology for both composites, the mica treated with a silane coupling agent enhances interfacial interaction with PP to a certain extent, compared with untreated mica.

AB - Crystallisation behaviour, morphology, dynamic mechanical, and mechanical properties have been studied for polypropylene copolymer (PP)-mica composites at various mica concentrations. Both treated and untreated mica significantly increased the modulus and improved the tensile and bending strength of the composites. Dynamic mechanical analysis indicates that the composites possess higher stiffness over a broad temperature range. Conversely, addition of both types of mica results in a deterioration of the notched impact strength. The reinforcing effect of the treated mica to the PP appears to be better than that of the untreated mica, whereas the impact properties of PP-treated mica and PP-untreated mica composites are similar at the same composition. According to morphological and crystallisation observations for the composites, the enhanced modulus, tensile, and bending strength can be attributed to alignment and orientation of the mica in the flow direction during injection moulding. The low impact strength of both composites results from the role of mica as a stress concentrator and also to the change in the microstructure of the matrix because of the nucleating effect of both types of mica on PP. By correlating the dynamic mechanical and mechanical properties to the morphology for both composites, the mica treated with a silane coupling agent enhances interfacial interaction with PP to a certain extent, compared with untreated mica.

M3 - Article

VL - 25

SP - 441

EP - 447

JO - Plastics, Rubber and Composites

JF - Plastics, Rubber and Composites

SN - 1465-8011

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ER -