Modification of montmorillonite with aminopropylisooctyl polyhedral oligomeric silsequioxane

作者：Zhao, Feng; Wan, Chaoying; Bao, Xujin^*; Kandasubramanian, Bala

来源：Journal of Colloid and Interface Science, 2009, 333(1): 164-170.

DOI：10.1016/j.jcis.2009.02.014

• Montmorillonite
• Dual surfactant
• Interlayer spacing
• Thermal stability
• Dispersion

Sodium montmorillonite (Na-MMT) was modified with various amounts of aminopropylisooctyl polyhedral oligomeric silsequioxane (POSS) and a second surfactant (alkyl ammonium based) via ion-exchange 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 melt-compounding 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.

• 出版日期2009-5-1
• 单位上海交通大学