Engineering Functional PVA: A Comprehensive Review of Chemical Modifications and Prospective Developments

In response to the growing demand for biocompatible and mechanically resilient materials, poly-(vinyl alcohol) (PVA)-based systems have gained considerable attention for their versatility in biomedical, industrial, and environmental uses. While PVA exhibits excellent film-forming and hydrogel-forming capabilities, as well as great biocompatibility, emerging applications require enhancements in thermal and mechanical performance, along with eco-friendly processing. This work identifies key strategies to augment PVA with desirable qualities, namely, cross-linking, grafting, and functionalization. For each approach, the underlying reaction mechanisms, critical processing parameters, and post-treatment effects are discussed in detail. The functional outcomes of these modifications are evaluated in the context of real-world applications, demonstrating PVA's adaptability and performance potential. Finally, obstacles impeding the development of PVA materials are addressed, along with noteworthy breakthroughs found in the recent literature. Future directions in research are also proposed to both leverage these newfound advancements and overcome the current hardships to further remarkable developments in practical utilizations.