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Thermal, mechanical, and water vapor barrier behavior of polypropylene composite containing modified kaolinite
Author(s) -
Albach Breidi,
Munaro Marilda,
Santos Pedro H.,
Zawadzki Sônia F.,
Schreiner Wido H.,
Rampon Daniel S.,
Barbosa Ronilson V.
Publication year - 2018
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.45785
Subject(s) - materials science , thermogravimetric analysis , polypropylene , kaolinite , silane , composite material , differential scanning calorimetry , surface modification , fourier transform infrared spectroscopy , thermal stability , crystallinity , montmorillonite , chemical engineering , polymer chemistry , physics , engineering , metallurgy , thermodynamics
Polypropylene composites containing modified kaolinite were prepared using melt processing and the morphological, thermal, mechanical and their water barrier properties were analyzed. To improve compatibility with polypropylene, kaolinite was modified with silane as a coupling agent. Characterization techniques (X‐ray diffraction, Fourier transform infrared spectroscopy, and X‐ray photoelectron spectroscopy) confirmed the effective grafting of these compounds on the surface and edges of the kaolinite with no functionalization on the inner surface. The differential scanning calorimetry and X‐ray diffraction techniques demonstrated that the addition of grafted kaolinite affected the iPP crystallinity. The thermogravimetric analysis helped to determine the thermal stability of the composites, being this, dependent on the amount of kaolinite and silane. The stress–strain tests demonstrated an increase in Young's modulus and obtained a 70% reduction in water vapor permeation. These improvements were mainly related to the increased compatibility between the iPP/Kaol interfaces promoted by the silane. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45785.