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Monday, 16 September 2019
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Raw materials & technologies, Applications

Cure-on-demand wood adhesive using frontal polymerisation of acrylates

Wednesday, 6 July 2016

A team of researchers from Louisiana State University demonstrated for the first time a cure-on-demand wood adhesive using thermal frontal polymerisation with Southern pine wood.

Cure-on-demand wood adhesive based on the frontal polymerisation of acrylates. Source: dande74/Fotolia.com

Cure-on-demand wood adhesive based on the frontal polymerisation of acrylates. Source: dande74/Fotolia.com

Monomer structure, initiator loading, and filler loading all had an impact on the strength of the adhesive and the cure-on-demand ability. More flexible, ethoxylated monomers produced stronger adhesives; though, the ethoxylate groups reduce the ability of the system to be polymerised frontally.

Fillers help overcome decreases in strength

Addition of a highly reactive comonomer (acrylic acid) to increase molecular weight between crosslinks along with the ethoxylated triacrylate increased the propensity for frontal polymerisation and made a tougher polymer. Increasing initiator loading could help ensure front propagation, but a maximum initiator loading was reached where the gaseous byproducts of the peroxide initiator made the network highly porous and thus lacking strength. Fillers such as kaolin and sawdust helped overcome decreases in strength at high initiator loadings.

The study is published in: Applied Polymer.

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