Effects of sucrose fatty acid esters on the stability and bonding performance of high amylose starch-based wood adhesive

- Sucrose fatty acid ester improved the stability and performance of adhesive.
- Sucrose fatty acid ester enhanced the thermal stability.
- Sucrose fatty acid ester prevented the aggregation of latex particles.
- Sucrose fatty acid ester inhibited the retrogradation of starch molecules.

A facile approach was developed to dramatically boost the performance of high amylose starch-based wood adhesive (HASWA) by addition of sucrose fatty acid esters (SEs). The results showed that the addition of 6% (w/w, dry starch basis) SEs significantly improved the bonding strength in both dry and wet states as well as the mobility and storage stability of the adhesive. The formation of amylose-SEs complexes were proved by blue value or differential scanning calorimetry (DSC) analysis. The results also indicated that the incorporation of SEs into the HASWA hindered the aggregation of latex particles and enhanced the thermal stability of starch molecules. Furthermore, SEs addition in the adhesive system resulted in the inhibition of starch retrogradation as observed by time sweep and pulsed nuclear magnetic resonance (PNMR) analysis. These findings provide important information to prepare bio-based high performance wood adhesive by adding SEs to replace the traditional petro-chemical based stocks adhesives.