Introduction of DNA into bio based UV cured vitrimer coating: Balancing flame retardancy and recyclability, weather resistant and stable system still needs to be validated

Research Overview

According to the study published in Progress in Organic Coatings, Volume 222, Part A (January 2027), authors Luigi Gamberini, Anna Liguori, Daniele Battegaazzore, Giulio Malucelli, and Maria Letizia Focarete proposed a class of bio based UV curable vitrimeric coatings and improved their flame retardant properties by introducing DNA, while also focusing on the coating’s recycling ability. This study combines biobased raw materials, UV curing technology, vitrimer dynamic cross-linking network, and biomacromolecule DNA, belonging to the work of coating material formulation and performance.

Key facts and data points

• System type: bio based UV curable vitrimeric coating, which is a UV curable coating containing a dynamic covalent cross-linking network.

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• Functional component: DNA is used as a component to enhance flame retardancy.

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• Research objective: In addition to flame retardancy, it also considers the circularity of coatings.

. Publication information: Progress in Organic Coatings, Volume 222, Part A, published in January 2027.

It should be noted that the above source text only provides the title, journal issue, publication time, and author information, and does not provide specific formula ratios, flame retardant test data (such as extreme oxygen index, UL-94 grade), photopolymerization conditions, dynamic network exchange temperature, or cycle recovery times, and other quantitative results. Therefore, this article does not make any inferences about its performance level.

Significance for the field of polymer aging and stabilization

From the perspective of polymer aging and stabilization technology, the value of this research lies primarily in the system design approach.

. When UV cured coatings are used outdoors or under light conditions, their weather stability depends on the matching of photo induced residues, polymer skeleton structure, and photo stable system. Biobased raw materials often contain structures that are susceptible to photo oxidation, such as unsaturated bonds or ester bonds. Without a reasonable antioxidant system and photo stable design, coatings may undergo yellowing, powdering, or mechanical performance degradation under UV exposure and thermal oxidative environments. This study uses UV curing technology, which involves free radical chemistry during the curing process. Residual photo initiator fragments may become the starting point for subsequent degradation, making processing stability and aging protection questions that must be answered before the system can be applied. Secondly, the vitrimer dynamic cross-linking network provides a pathway for the recyclability of coatings, but dynamic bonds may participate in side reactions under high temperature or long-term light exposure, affecting network stability. When evaluating such coatings, it is necessary to simultaneously examine the dynamic exchange behavior and structural evolution during aging, in order to avoid conflicts between recyclable design and service life. Thirdly, introducing DNA as a flame retardant functional component into coatings belongs to the concept of biobased functional fillers. Phosphorus containing and nitrogen-containing biomolecules can promote char formation during combustion, but the impact of these components on photostability is not yet clear. If DNA and its degradation products participate in free radical reactions under ultraviolet light, a synergistic protection system of HALS (hindered amine light stabilizer) and UVA (ultraviolet absorber) may be required. HALS mainly captures free radicals and inhibits photooxidation chain reactions, while UVA reduces the probability of excited state formation by shielding ultraviolet radiation. The combination of the two often exhibits better weather stability than a single component in coatings. The key challenge in formulation design is how to introduce a stable system for UV cured coatings containing bio based components and dynamic networks without interfering with the UV curing process. In addition, the dual objectives of flame retardancy and recyclability involved in this study suggest that stabilization schemes should not only focus on aging protection, but also be compatible with flame retardant mechanisms and recycling processes. For example, some antioxidant systems or HALS may affect the combustion to char behavior, while stabilizer residues during heat or chemical recovery processes may also alter the exchange efficiency of dynamic networks. This requires moving the evaluation of polymer aging to the formulation screening stage in actual development, and synchronously examining weather stability, flame retardancy, and recyclability through accelerated aging and characterization methods.

Issues to be clarified

Due to the lack of specific experimental data disclosed by the source, the performance retention rate of the coating after UV aging, the specific selection of antioxidant and photostable systems, the influence of DNA addition on curing kinetics, and the performance degradation after cyclic recovery are all unclear.

. Subsequent studies need to combine accelerated aging tests, spectral characterization, and mechanical testing to determine the actual potential of the bio based UV cured vitrimer coating in terms of weather stability.

Information source:Bio-based UV-curable vitrimeric coatings incorporating DNA for enhanced flame retardancy and circularity， Organized by Herun Chemical.