醋酸环境对醋酸胶片物理性能的影响研究

醋酸胶片的片基材料醋酸纤维素酯水解产生的"醋酸综合症"是影像部门保存醋酸胶片过程中遇到的最大技术难题之一,目前还没有较好的治理方法,其在降解过程中释放出的醋酸严重影响胶片的耐久性,关于其物理性能变化及相关性的研究较少.本文通过模拟密闭环境中醋酸浓度的累积实验,系统地分析了醋酸在胶片降解过程中对胶片物理性能的影响.实验结果表明,醋酸环境会加速胶片的降解,且随着醋酸浓度的增加,胶片扭曲变形程度增加,胶片的降解程度(酸度)增加;抗张强度减弱,但耐折度增加;含湿量和胶片乳剂层面的亲水性增加,同时胶片的热稳定性变差.

Research of Acetic Acid Environment Affect on the Acetate Film Physical Properties

The so-called "Acid Syndrome" produced by Hydrolysis of cellulose acetate film is one of the biggest challenge in preservation. No better treatment for it so far, and acetic acid produced by film itself degradation will seriously affect the film physical properties, but the research of film physical properties change by acetic acid was less. In this paper, through anolog experiment of acetic acid accumulation in airtight environment, and analyzed the effects of acetic acid on physical properties in film degradation process. The results showed that acetic acid can accelerate degradation of the film. With the acetic acid increased , the degree of distortion and degradation, moisture content, the emulsion layer hydrophilicity and folding endurance were all increased, but the tensile strength and thermal stability of the film decreased.