Characterization of the structure of modified clay by Raman spectroscopyстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 12 июля 2017 г.
Аннотация:One of promising fillers for polymers, sodium mont- morillonite modified by dioctadecyldimethylammonium bromide (DODAB), has been studied by Raman spectroscopy, X-ray anal- ysis, and differential scanning calorimetry (DSC). It has been shown that an increase in theDODABcontent enlarges the height of a clay interlayer space through filling the clay interlayer gal- leries with DODAB molecules. According to both Raman and DSC data, DODAB molecules grafted to the clay can be in three different phase states depending on the modifier content. At a low DODAB content, its molecules are separated and contain a significant amount of gauche-conformers in methylene chains. At a medium content, the DODAB molecules form clusters, and the amount of trans-conformers in theDODABmethylene chains considerably increases. At a high DODAB content, its molecules are straightened and form a 2D ordered structure with either hexagonal or triclinic symmetry