Assessingthe crosslinking behavior of nanocomposites based on epoxy and starch-modified graphene oxide nanosheets potent to be applied as engineering coatings

Yarahmadi, Elham; Didehban Afshord, Khadijeh; Shabanian, Meisam; Saeb, Mohammad Reza

Assessingthe crosslinking behavior of nanocomposites based on epoxy and starch-modified graphene oxide nanosheets potent to be applied as engineering coatings

Authors

E. Yarahmadi ¹

K. Didehban Afshord ¹

M. Shabanian ²

M. R. Saeb ³

¹ Department of Chemistry, Payame Noor University, Tehran, Iran

² Faculty of Chemistry and Petrochemical Engineering, Standard Research Institute (SRI), P.O. Box 31745-139, Karaj, Iran

³ Department of Resin and Additives, Institute for Color Science and Technology, Tehran, Iran

Abstract

In this research,nanocomposite coatings based on epoxy containing pristine graphene oxide and starch-modified graphene oxide are prepared and characterized by Fourier transfer infrared spectroscopy, andtheir crosslinking behavior is studied using nonisothermal differential scanning calorimetry.These nanocomposites, because of having platelet-like nanomaterials inside and their organic origin, can be applied as coating on metal surface in diverse industries.The reason behind using starch was its natural basis and abundance of hydroxyl groups in its structure which can take part in crosslinking reaction with epoxide. Neat epoxy systems having amine curing agent, and nanocomposites containing epoxy, amine curing agent, andpristine or starch-modified graphene oxide nanosheets were cure at different heating rates to assess their curing behavior. Change in hearing rate of test caused change in onset and peak temperature of the exotherm curves and consequently heat of reaction changed. It was observed that the presence of the graphene oxide nanosheets hindered the crosslinking reactions, while surface modification of them with starch natural polymer compensated for such a hindrance via catalytic role of starch, and increased crosslink density of system.

Keywords

Epoxy nanocomposite

Starch

Crosslinking reactions

differential scanning calorimetry

Subjects