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Monday, 14 October 2019
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Raw materials & technologies, Raw materials

Synthesising diblock copolymers as modifiers for epoxy resin

Friday, 23 May 2014

The effects of two diblock copolymers on the mechanical properties of epoxy coatings were studied.

The abrasive wear resistance of thin coatings increased with the modified epoxy inclusion Source: alexzaitsev - Fotolia.com

The abrasive wear resistance of thin coatings increased with the modified epoxy inclusion Source: alexzaitsev - Fotolia.com

Both modifiers, poly(ethylene-alt-propylene)-b-poly(ethylene oxide) (PEP-PEO) and poly(1,2-butadiene)-b-poly(2-vinyl pyridine) (PB–P2VP), self-assembled into spherical micelles of 10-20 nm diameter in cured bulk epoxy. This morphology was preserved in 15μm thick coatings; however, micelle segregation to the coating/substrate interface was also observed.

Abrasive wear resistance improves

The critical strain energy release rate, G1c, of bulk thermosets was enhanced by up to fivefold with the addition of block copolymers. Likewise, the abrasive wear resistance of thin coatings increased with modifier inclusion. The results showed that at 5wt.% of loading, block copolymers were able to impart a 40% increase in abrasive wear resistance to modified coatings over neat ones. Block copolymer modifiers did not sacrifice the modulus and glass transition temperature of bulk thermosets and coatings, or the hardness and transparency of coatings.

The study is published in: Progress in Organic Coatings, Volume 77, Issue 7, July 2014, Pages 1145-1154.

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