PLA/Starch Composites: New Applications as Control Release Materials

TL;DR

This paper reviews how combining PLA and starch creates eco-friendly materials that can control the release of substances, useful for packaging and agriculture.

Contribution

The paper introduces new applications of PLA/starch composites as controlled-release materials by leveraging their phase-separated structures.

Findings

PLA/starch composites can be tailored to create water-responsive pathways for tunable release of substances.

These composites have been successfully used in antimicrobial food packaging and slow-release fertilizer coatings.

The paper discusses fabrication strategies and structure–property relationships for controlled-release performance.

Abstract

Poly(lactic acid) (PLA)/starch composites have attracted considerable attention as promising eco-friendly materials due to their renewable origins and complementary properties. The system synergized benefits including cost reduction and enhancing biodegradation through filled with starch, and reducing moisture sensitivity by adding PLA. In recent years, PLA/starch composites have also emerged as functional materials for controlled-release applications, benefiting from their inherent phase-separated structures and distinct water solubility and degradation behaviors of the two components. By tailoring starch content and dispersion, starch-rich domains can serve as water-responsive pathways within the PLA matrix, enabling tunable release of functional substances from films or coatings. This concept has been successfully demonstrated in applications such as antimicrobial food packaging and slow-release fertilizer coatings. This review first outlines the fundamental aspects of PLA/starch composites, including microstructure, interfacial compatibility, and biodegradability. It then focuses on their design and performance as controlled-release systems, covering fabrication strategies, structure–property relationships, and evaluation methods. Finally, the advantages and limitations of current PLA/starch-based controlled-release materials are critically discussed, and future research directions are proposed to guide the development of sustainable, multifunctional materials for food packaging and agricultural applications.

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