Chemical modification of hybrid nanostructures (POSS) for application as lubricant

Authors

  • Caroline Luvison Universidade de Caxias do Sul - UCS
  • María Cristina Moré Farias Universidade de Caxias do Sul - UCS
  • Otávio Bianchi Universidade de Caxias do Sul - UCS

DOI:

https://doi.org/10.18226/23185279.v2iss1p19

Abstract

Polyhedral oligomeric silsesquioxanes (POSS) are hybrid structures type RSiO15n, with n organic groups R. These molecules can be easily functionalized by simply changing the chemical constitution of the organic groups. In this work, chemical modification of POSS-NH2 was performed by amidation reaction with butyric acid at elevated temperature, 160°C. The formation of the amide group is evinced by the appearance of NH angular deformation band at 1540 cm-1 in the FTIR spectra. Approximately 40% of the amino groups reacted, according to titration results. The formation of the amide groups resulted in a shift of the glass transition temperature (Tg) from -36.9°C to -25.6°C for the modified-POSS sample. Both POSS-NH2 and modified-POSS samples exhibited similar thermal degradation pattern. Analysis of the pairs distribution function (PDF) has determined that the hybrid nanoparticles are separated by a periodic distance of approximately 1.32 nm. POSS-NH2 and modified-POSS exhibit newtonian behavior, which will range from 10-1 s-1 and 1000 s-1. The viscosity decreased with increasing temperature, a typical behavior of liquid lubricants.

 

http://dx.doi.org/10.18226/23185279.v2iss1p19

Author Biography

Caroline Luvison, Universidade de Caxias do Sul - UCS

Possui graduação em Química Industrial pela Universidade Regional e Integrada do Alto Uruguai e das Missões (2008), mestrado (2012) em Engenharia e Ciência dos Materiais pela Universidade de Caxias do Sul sendo o tema da dissertação na área de revestimentos metálicos. Atualmente é aluna de doutorado na Universidade de Caxias do Sul onde atua na área de síntese de nanocompositos híbridos lubrificantes para aplicação tribológicas extremas.

Published

2014-05-26

How to Cite

Luvison, C., Farias, M. C. M., & Bianchi, O. (2014). Chemical modification of hybrid nanostructures (POSS) for application as lubricant. Scientia Cum Industria, 2(1), 19–25. https://doi.org/10.18226/23185279.v2iss1p19

Issue

Section

Science, Education and Engineering