No presente trabalho a argila natural mica muscovita foi organofilizada empregando tratamentos de troca catiônica com sal de lítio e, posteriormente, com sal quaternário de amônio como intuito de promover o aumento do espaçamento basal de seus planos cristalinos e aumentar a compatibilidade com materiais poliméricos. O umento da distância interlamelar da mica muscovita possibilita a formação de nanocompósitos poliméricos com elevadas propriedades térmicas e mecânicas. Os resultados mostraram que foi necessário realizar uma série de tratamentos com sal de lítio para que a distância nterplanar da mica d(001) fosse aumentada de 9,90 Å para 11,94 Å. Somente após o tratamento subsequente com solução do sal brometo de trimetil hexadecil amônio ocorreu o aparecimento de uma nova reflexão no difratograma de raios X em menores ângulos e a difração típica da mica desapareceu. Este comportamento indicou que ocorreu a troca iônica do lítio pelo sal de amônio e a distância interplanar foi aumentada de 11,94 Å para 18,56 Å.
In the present study, the natural clay mica muscovite was organophilizated using cation exchange reaction with lithium salt and subsequently with quaternary ammonium salt in order to promote increased basal spacing of their crystal planes and rise of compatibility with polymeric materials. The increase in the interlayer distance of mica muscovite enables the formation of polymer nanocomposites with high thermal and mechanical properties. The results showed that it was necessary to perform a series of treatments using the lithium salt to allow increasing of the interplanar distance of mica d (001) from 9.90 Å to 11.94 Å. Only after the subsequent treatment with a solution of hexadecyl trimethyl ammonium bromide salt it was noticed the appearance of a new reflection in the X-ray diffractogram at smaller diffraction angles and the one typical of mica disappeared. This behavior indicates the lithium ion exchange to the ammonium salt while the interplanar distance was increased from 11.94 Å to 18.56 Å
Organophilization of mica muscovite for preparation of polymer nanocomposites
Gerbasi R;Cavallin T;Galenda A
2015
Abstract
In the present study, the natural clay mica muscovite was organophilizated using cation exchange reaction with lithium salt and subsequently with quaternary ammonium salt in order to promote increased basal spacing of their crystal planes and rise of compatibility with polymeric materials. The increase in the interlayer distance of mica muscovite enables the formation of polymer nanocomposites with high thermal and mechanical properties. The results showed that it was necessary to perform a series of treatments using the lithium salt to allow increasing of the interplanar distance of mica d (001) from 9.90 Å to 11.94 Å. Only after the subsequent treatment with a solution of hexadecyl trimethyl ammonium bromide salt it was noticed the appearance of a new reflection in the X-ray diffractogram at smaller diffraction angles and the one typical of mica disappeared. This behavior indicates the lithium ion exchange to the ammonium salt while the interplanar distance was increased from 11.94 Å to 18.56 ÅI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
