PDF(Pubmed)
Abstract：
While extensive research has focused on understanding the degradation mechanisms of Poly(vinyl acetate) (PVAC) paint under different environmental conditions, limited attention has been paid to the long-term stability of PVAC-based white glues, especially when used in artworks. This study investigates the accelerated degradation, under simulated photoaging, and isothermal treatment of a commercial PVAC-based white glue considered representative of this class of materials used in contemporary artworks to predict its durability and assess its behavior in art objects. Through accelerated aging experiments and comparison with natural aging observed in artworks, the study reveals the formation of chromophores and the release of plasticizers as key processes; in particular, the progressive darkening was considered an early indicator of degradation processes, before structural changes could be detected by FTIR or NMR spectroscopies. The plasticizer loss induces an increase in glass transition temperature, from 7 °C to temperatures higher than room temperature, affecting the adhesive\'s cohesive strength and contributing to the detachment of materials in artworks. The findings underscore the importance of preventive conservation measures to mitigate degradation issues in PVAC-based artworks.
摘要：
虽然广泛的研究集中在了解聚乙酸乙烯酯（PVAC）涂料在不同环境条件下的降解机理，对PVAC基白胶的长期稳定性关注有限，尤其是在艺术品中使用时。这项研究调查了加速降解，在模拟光老化下，以及对商业PVAC基白胶的等温处理，这些白胶被认为是当代艺术品中使用的此类材料的代表，以预测其耐久性并评估其在艺术品中的行为。通过加速老化实验，并与艺术品中观察到的自然老化进行比较，该研究揭示了发色团的形成和增塑剂的释放是关键过程；特别是，逐渐变暗被认为是退化过程的早期指标，在FTIR或NMR光谱检测到结构变化之前。增塑剂损失引起玻璃化转变温度的增加，从7°C到高于室温的温度，影响粘合剂的内聚强度，并有助于艺术品中材料的分离。研究结果强调了预防性保护措施的重要性，以减轻基于PVAC的艺术品中的退化问题。
