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Modification of montmorillonite with aminopropylisooctyl polyhedral oligomeric silsequioxane
journal contributionposted on 2016-09-13, 10:39 authored by Feng Zhao, Chaoying Wan, Xujin BaoXujin Bao, Balasubramanian Kandasubramanian
Sodium montmorillonite (Na-MMT) was modified with various amounts of aminopropylisooctyl polyhedral oligomeric silsequioxane (POSS) and a second surfactant (alkyl ammonium based) via ionexchange reactions. Interlayer spacing, interlamellar structure, and thermal and surface properties of these organoclays were characterized by wide angle X-ray diffraction, thermogravimetric analysis, and contact angle measurement. The interlayer space of POSS-modified clay (POSS-MMT) was strongly dependent on the arrangement of POSS surfactant but less dependent on the POSS concentration. The sodium ions in Na-MMT were only partially exchanged by protonized POSS due to the steric hindrance effect. In addition, the dual-surfactant-modified clays exhibited increased exchange ratios by controlling the amount of the second surfactant, resulting in a good balance in hydrophobicity and polarity of the modified clays. The resultant organoclays were mixed with polypropylene (PP) via a meltcompounding method. It was found that the dual-surfactant-modified clays with low polarity and similar hydrophobicity to PP were well dispersed in the PP matrix.
The authors gratefully acknowledge the financial support of the UK Department of Trade and Industry/Technology Strategy Board.
- Aeronautical, Automotive, Chemical and Materials Engineering
Published inJournal of Colloid and Interface Science
Pages164 - 170
CitationZHAO, F. ... et al., 2009. Modification of montmorillonite with aminopropylisooctyl polyhedral oligomeric silsequioxane. Journal of Colloid and Interface Science, 333 (1), pp.164-170.
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