Study on the Aging Dynamics and Degradation Mechanism of Polynitroglycerin before and after Curing

Research Overview: Volume 254 of Polymer Degradation and Stability published a study on the aging behavior of poly (glycidyl nitrate) (PGN) by Xueling Gong, Qingyuan Zhang, Liqiong Luo, Bo Jin, and Rufang Peng. The study was published in December 2026. The research focuses on the aging kinetics and performance degradation mechanism of PGN in two stages before and after curing, which belongs to the fundamental and mechanistic work of polymer aging and stabilization technology. From the publicly available bibliographic information, the core clue of this study is the comparison between “before and after curing”: the curing process changes the chain segment mobility, network structure, and residual end group state of the polymer, which usually directly affect the degradation rate and path of the material under environmental factors such as heat and oxygen. The study takes aging kinetics as the starting point and combines performance degradation mechanism analysis to attempt to answer whether and how curing crosslinking changes the aging sensitivity of PGN.

Why is it worth paying attention to in the polymer additives industry?

PGN is a type of polyether based energetic adhesive with nitrate ester groups located on the side chains. Its main chain is a polyether structure, and the side chain nitrate ester groups may decompose under heat, light, or long-term storage conditions. The released acidic products will further catalyze the degradation of the main chain, forming a self accelerating aging process.

. This feature is similar to the common oxidative degradation in general polyether and polyurethane materials, but also has its own characteristics. For formulation engineers engaged in research on polymer aging, such systems are typical objects for observing “degradation product self catalysis” and “timing of stable system intervention”. In terms of weather stability and storage life assessment, the difference in aging kinetics before and after curing suggests that stabilization conclusions obtained from uncured resins or model compounds may not be directly extrapolated to actual cured products. Curing the network can restrict the movement of molecular chains, alter the diffusion and termination behavior of free radicals, and also affect the migration and distribution of stabilizing agents in the matrix. For the design of antioxidant systems, this means that the screening and optimization of additives need to be evaluated in conjunction with the curing process and final network structure, rather than relying solely on data from the liquid or uncured stage. From the perspective of stabilization technology, the aging protection of nitrate ester polyether systems usually requires a balance between free radical chain oxidation and acidic degradation products. HALS, a hindered amine light stabilizer, is widely used in polyether and polyurethane systems to inhibit photocatalytic degradation, and its effect depends on migration and regeneration cycles in the matrix; And UV absorbersUVAslow down from the source by blocking UV energy. The complex system composed of two types of additives and the main antioxidant often better meets the stability requirements during processing and long-term use than a single component in actual formulations. The comparison ideas provided by this study before and after solidification can provide methodological references for the performance evaluation of composite systems in different material states.

Inspiration for formulation and detection work

At the level of detection characterization, aging kinetics research usually relies on thermal analysis, spectral tracking, and data on the evolution of mechanical properties over time.

. Combining these methods with the characterization of curing degree and crosslinking density can help distinguish between “performance degradation caused by incomplete curing” and “performance degradation caused by chemical degradation”, which is particularly important for predicting the lifespan of energetic materials and similar high filling and high crosslinking systems. It should be pointed out that currently the publicly available information is only the title and author information, and details such as specific experimental conditions, kinetic parameters, types and amounts of stabilizing agents have not been disclosed. Therefore, the above discussion on antioxidant systems, HALS, UVA, and complex systems belongs to industry correlation analysis based on this research topic, and is not the conclusion of the original text. It is recommended to pay attention to the complete data after the official publication of this article, especially the quantitative results of degradation activation energy before and after solidification, degradation product types, and the effectiveness of stabilization measures. Source: Polymer Degradation and Stability, Volume 254, December 2026, titled “Aging kinetics and performance degradation mechanisms of poly (glycidyl nitrate) before and after curing”.

Information source:Aging kinetics and performance degradation mechanisms of poly(glycidyl nitrate) before and after curing， Organized by Herun Chemical.