High-Performance Water-Activated Paper Tape Coated with Starch-Based Physically Cross-Linked Adhesive

This study introduces a high-performance, fully biodegradable starch-based water-activated paper tape as a sustainable alternative to conventional petroleum-based packaging tapes. The key innovation is a physically cross-linked adhesive system utilizing synergistic interactions between waxy cassava starch (WCS) and poly(vinyl alcohol) (PVA), with carboxymethyl cellulose (CMC) incorporated as a network enhancer. This ternary composition forms a robust hydrogen-bonded network that overcomes the typical limitations of starch adhesives, such as inadequate peel strength and poor thermal stability. The resulting tape demonstrates superior performance, achieving a peel strength of 6.3 N/cm and a tack grade of #10 on the steel ball test, markedly exceeding commercially available products, which typically reach 4-5 N/cm and grade #7-8. By combining high mechanical strength, rapid wet-adhesion capability, and complete biodegradability, this work provides a scalable and eco-friendly solution for corrugated packaging, effectively addressing the environmental challenge of persistent plastic waste from single-use applications.