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A Comparative Study of Un-Modified and Modified Acrylate-SiO2 Nanocomposites

Published online by Cambridge University Press:  05 September 2017

Mireya L. Hernández-Vargas ,
Rubén Castillo-Perez ,
Oscar Hernández-Guerrero ,
Bernardo F. Campillo-Illanes  and
Osvaldo Flores-Cedillo
Mireya L. Hernández-Vargas*
Affiliation:
Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria D.F.04510, MEXICO. Posgrado de Ingeniería, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria D.F, 04519, MEXICO. Instituto de Ciencias Físicas, UNAM, Av. Universidad s/n, Col. Chamilpa, Cuernavaca, Morelos, 62210, MEXICO.
Rubén Castillo-Perez
Affiliation:
Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria D.F.04510, MEXICO. Posgrado de Ingeniería, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria D.F, 04519, MEXICO. Instituto de Ciencias Físicas, UNAM, Av. Universidad s/n, Col. Chamilpa, Cuernavaca, Morelos, 62210, MEXICO.
Oscar Hernández-Guerrero
Affiliation:
Facultad de Ciencias Químicas e Ingeniería, Centro de Investigación en Ingeniería y Ciencias Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca, Morelos, 62209, MEXICO. Instituto de Ciencias Físicas, UNAM, Av. Universidad s/n, Col. Chamilpa, Cuernavaca, Morelos, 62210, MEXICO.
Bernardo F. Campillo-Illanes
Affiliation:
Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria D.F.04510, MEXICO. Instituto de Ciencias Físicas, UNAM, Av. Universidad s/n, Col. Chamilpa, Cuernavaca, Morelos, 62210, MEXICO.
Osvaldo Flores-Cedillo
Affiliation:
Instituto de Ciencias Físicas, UNAM, Av. Universidad s/n, Col. Chamilpa, Cuernavaca, Morelos, 62210, MEXICO.
*
*(Email: [email protected])
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Abstract

Based on the nature of the links and interactions existing at the hybrid interface, hybrid materials can be broadly classified in two main designations: a) Hybrid compounds Class I, that include all systems with electrostatic forces, hydrogen bonding or Van der Waals interactions and b) Hybrid compounds Class II, showing that the inorganic and organic components are linked through strong covalent or ionic-covalent bonds. The physico–chemical properties of nanostructured copolymer acrylates based on butyl acrylate (BA), methyl methacrylate (MMA) and acrylic acid (AA) has been investigated employing un-modified SiO2 (Class I) and modified SiO2 particles (Class II) using 3-(trimethoxysilyl) propyl methacrylate (MPS) as compatibilizing agent. The synthesis was carried out using seeded batch emulsion polymerization system. Metastable nanostructured emulsions containing 1 wt% nanoparticles were obtained. Films casted from the in-situ nanostructured latex exhibited excellent optical transparency suggesting good nanoparticles dispersion. However, the mechanical properties showed by SiO2-MPS nanocomposite, are better than the Class I hybrid compounds. Therefore, SiO2-MPS surface treatment prior to polymerization enhances the physical properties of copolymer BA-MMA-AA film. The mass loss derivative traces for the polyacrylic nanocomposites and the neat polymer obtained by thermogravimetric analysis showed that the onset temperature for thermal decomposition was shifted towards a higher temperature than the neat polyacrylic, indicating the enhancement of thermal stability of the un-modified SiO2 nanocomposite. However, there is a decrease of 40°C in the decomposition temperature for the modified polyacrylic nanocomposite. The results obtained so far have shown that weak Van der Waals and H-bonding interactions may be sufficient to enable improvement of the physical properties of the acrylate nanocomposites.

Keywords

NanoscalePolymerThermogravimetric Analysis (TGA)
Type
Articles
Information
MRS Advances , Volume 2 , Issue 49: International Materials Research Congress XXV , 2017 , pp. 2737 - 2743
Copyright
Copyright © Materials Research Society 2017 

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References

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