Modified Starch-Based Adhesives: A Review.

Area of Science:

• * Materials Science
• * Polymer Chemistry
• * Green Chemistry

Background:

• * Growing consumer demand for eco-friendly products is pushing industries to find alternatives to petroleum-based polymers.
• * Starches, being non-toxic and low-cost biodegradable raw materials, present a sustainable option for adhesive production.
• * Native starch has limitations, but chemical modification, particularly esterification, significantly improves water resistance for adhesive uses.

Purpose of the Study:

• * To review the production methods of esterified starches.
• * To explore the application of these modified starches in various adhesive formulations.
• * To discuss other modification techniques and processing considerations for starch-based adhesives.

Main Methods:

• * Focus on esterification, transesterification, alkylation, acetylation, succinylation, and enzymatic reactions for starch modification.
• * Examination of etherification, crosslinking, grafting, oxidation, and bio-based coupling agents for further modification.
• * Analysis of starch material characteristics and processing requirements for adhesive formulation.

Main Results:

• * Esterified starches can be feasibly produced and utilized to create bio-based adhesives.
• * These modified starches demonstrate improved water resistance compared to native starches.
• * The review covers applications in paper, plywood, wood composites, fiberboard, and particleboard.

Conclusions:

• * Chemically modified starches, especially esterified variants, are promising for developing sustainable, high-performance bio-based adhesives.
• * Various chemical and enzymatic modification routes can tailor starch properties for specific adhesive applications.
• * Further research into material characteristics and processing is crucial for optimizing starch-based adhesives.