Investigation on microstructures, melting and crystallization behaviors, mechanical and processing properties of β-isotactic polypropylene /CaCO3 toughening masterbatch composites

Investigation on microstructures, melting and crystallization behaviors, mechanical and... In this study, β-isotactic polypropylene (β-iPP)/CaCO3 toughening masterbatch (CTM) composites were compounded in a single screw extruder. The microstructures and properties of the composites were investigated. It was shown that CTM influenced the crystallinity and crystallization temperature of β-iPP. The flexural modulus and storage modulus (E’) at 23 °C increased with the increasing CTM content, implying the increased stiffness of the composites. The improved miscibility between β-iPP and CTM was demonstrated by the decreased glass transition temperatures of the composites. The Izod notched impact strength at 23 °C of the composites was directly related to the CTM content because of the competition between the morphological feature of β-iPP and the content of inorganic rigid toughening particles. The critical ligament thickness (τ c = 1.47 μm) at 40% CTM content was calculated according to the modified Wu’s equation. The morphologies of impact fractured surfaces were observed and the massive shear deformation was related to the debonding of CaCO3 particles. The presence of CTM also improved the melt flowability and dimensional stability but it was detrimental to heat deflection temperature (HDT) of the composites. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Polymer Research Springer Journals

Investigation on microstructures, melting and crystallization behaviors, mechanical and processing properties of β-isotactic polypropylene /CaCO3 toughening masterbatch composites

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Publisher
Springer Journals
Copyright
Copyright © 2017 by Springer Science+Business Media B.V.
Subject
Chemistry; Polymer Sciences; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials
ISSN
1022-9760
eISSN
1572-8935
D.O.I.
10.1007/s10965-017-1375-4
Publisher site
See Article on Publisher Site

Abstract

In this study, β-isotactic polypropylene (β-iPP)/CaCO3 toughening masterbatch (CTM) composites were compounded in a single screw extruder. The microstructures and properties of the composites were investigated. It was shown that CTM influenced the crystallinity and crystallization temperature of β-iPP. The flexural modulus and storage modulus (E’) at 23 °C increased with the increasing CTM content, implying the increased stiffness of the composites. The improved miscibility between β-iPP and CTM was demonstrated by the decreased glass transition temperatures of the composites. The Izod notched impact strength at 23 °C of the composites was directly related to the CTM content because of the competition between the morphological feature of β-iPP and the content of inorganic rigid toughening particles. The critical ligament thickness (τ c = 1.47 μm) at 40% CTM content was calculated according to the modified Wu’s equation. The morphologies of impact fractured surfaces were observed and the massive shear deformation was related to the debonding of CaCO3 particles. The presence of CTM also improved the melt flowability and dimensional stability but it was detrimental to heat deflection temperature (HDT) of the composites.

Journal

Journal of Polymer ResearchSpringer Journals

Published: Nov 8, 2017

References

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