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Rubber Nanodomains Reinforced Epoxy Resin

Published online by Cambridge University Press:  02 May 2016

JA. Arcos Casarrubias ,
A. Reyes-Mayer ,
R. Guardian-Tapia ,
P. Castillo-Ocampo  and
A. Romo-Uribe
JA. Arcos Casarrubias
Affiliation:
División de Ingeniería Química y Bioquímica, Tecnológico de Estudios Superiores de Ecatepec, Edo. de Mex. 55210, MEXICO.
A. Reyes-Mayer
Affiliation:
Laboratorio de Nanopolimeros y Coloides, UNAM, 62210. MEXICO. Centro de Investigación en Ingeniería y Ciencias Aplicadas, UAEM, 62209. MEXICO.
R. Guardian-Tapia
Affiliation:
Centro de Investigación en Ingeniería y Ciencias Aplicadas, UAEM, 62209. MEXICO.
P. Castillo-Ocampo
Affiliation:
Laboratorio de Microscopia Electronica, Universidad Autonoma Metropolitana- Iztapalapa
A. Romo-Uribe*
Affiliation:
Laboratorio de Nanopolimeros y Coloides, UNAM, 62210. MEXICO.
*
†To whom all correspondence should be addressed: [email protected]
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Abstract

It has been reported that the addition of liquid rubbers, like poly(dimethylsiloxane) (PDMS), to epoxy resins alter the final morphology, increase the toughness and influence the curing kinetics. Due to immiscibility, there is phase separation of the elastomeric phase during curing giving rise to microdomains embedded in the epoxic matrix. The resultant heterogeneous morphology obtained after the reaction controls to an important extent the properties of the epoxy composite. Here we report a method to obtain well-dispersed rubber nanodomains of silyl-diglycidyl ether terminated polydimethyl siloxane (PDMS-DGE) in diglycidyl ether of bisphenol-A (DGEBA) epoxy by using a prepolymerization step. Light scattering and optical microscopy showed that initial mixing of pre-polymerized rubber produced phase separation with micron-scale droplet formation. However, as the curing reaction proceeded, the rubber domains decreased below optical resolution, light scattering intensity reached a maximum and then decreased. Finally, rubber nanodomains of about 100 nm size were formed at the end of curing reaction, as revealed by transmission electron microscopy (TEM). The pre-polymerization step induced a two-fold increase in gel time, tgel, due to lesser active groups available for reaction. Strikingly, tensile modulus and toughness increased, suggesting rubber-epoxy interaction. The final nanocomposite also exhibited higher thermal stability and char formation.

Keywords

nanostructurepolymerizationcoating
Type
Articles
Information
MRS Advances , Volume 1 , Issue 21: Nanomaterials and Synthesis , 2016 , pp. 1571 - 1576
Copyright
Copyright © Materials Research Society 2016 

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References

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