Preparation and properties of epoxy nanocomposites. Part 1. The effect of pre-mixing on dispersion of organoclay

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Proceedings titlePolymer Engineering and Science
ConferenceFourth International Symposium on Polymer Nanocomposites Science and Technology (Polymer Nanocomposites 2007), October 17-19, 2007, Boucherville, Québec, Canada
Pages666672; # of pages: 7
SubjectMixing; dispersion; nanoclay; epoxy; nanocomposites
AbstractThe effect of pre-mixing clay with the epoxy on the dispersion of organoclay in epoxy nanocomposites was studied using different mixing approaches: hand stirring, conventional mechanical stirring, a homogenizer, and a microfluidizer. The epoxy resin and the hardener were EPON™ 828 from Resolution Performance Products and Hunstman Jeffamine® D-230 (an amine-terminated polyoxypropylene diol). The organo-clay Cloisite 30B (montmorillonite treated with a quaternary ammonium intercalant) was used. Epoxy and its nanocomposites were cured either at room temperature for 2 days or at 120°C for 2 hours, with subsequent post-cure at 140°C for 2 hours in both cases. The quality of dispersion and intercalation/exfoliation of organoclay in epoxy after pre-mixing (before adding hardener) was analyzed by means of X-ray diffraction (XRD) and rheological measurement. The dispersion and intercalation/exfoliation of organoclay in the epoxy nanocomposites (ENCs) after curing were characterized by XRD, field emission gun scanning electron microscopy (FEGSEM) and transmission electron microscopy (TEM). To quantify the dispersion, image analysis was also performed. The results indicate that both the pre-mixing and curing steps play a determining role in the dispersion and intercalation/exfoliation of organoclay. During curing, the organoclay can be further intercalated by the epoxy resin quite easily and the intercalation and exfoliation process can continue further or not depending on the curing rate. Although full exfolia-tion of clay cannot be achieved at the pre-mixing stage, this step appears to be very important in controlling the micro-dispersion and thus affecting the further intercalation and exfoliation that take place during the curing step. A well dispersed and well intercalated/exfoliated state of organoclay in ENC can be achieved with a non-solvent-assistance method by using a homogenizer and controlling the curing process.
Publication date
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedNo
NRC number54243
NPARC number18335906
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Record identifier2d1e5d4c-43d9-41ad-ab4f-5e29ad1417a3
Record created2011-07-29
Record modified2016-05-09
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