tbc

待定

• 批准号: 2590550
• 金额: --
• 依托单位: University College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2025
• 资助国家: 英国
• 起止时间: 2025 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2590550
• 关键词: tbc

Cellulose-based polymers such as cellulose acetate are of increasing interest as bio-based materials. However, their environmental degradability is a complex question. Approximately 4.5 trillion cellulose acetate cigarette filters are discarded annually and these are often persistent as litter.1 In contrast, cellulose-based polymers in many museum collections have been observed to decay rapidly, leading to loss of valuable cultural heritage.2 Specific degradation mechanisms such as hydrolytic deacetylation and photolytic chain scission are known. However, an understanding of the way these degradation mechanisms interact in complex environments is needed to better understand how these materials degrade, both in the natural environment and in museums.3 This collaborative project between the UCL Institute for Sustainable Heritage and the UCL Institute for Sustainable Resources aims to understand these interactions. Relationships between photo-oxidative and hydrolytic processes will be explored, in addition to accompanying changes in physical properties. The student will conduct accelerated aging experiments and use analytical techniques such as Nuclear Magnetic Resonance (NMR) and Fourier Transform Infrared (FTIR) spectroscopies, Gel Permeation Chromatography (GPC) and tensile testing to understand changes in material properties. This project is expected to have a significant impact on both the issue of persistent plastic litter and on heritage conservation.

纤维素基聚合物（例如醋酸纤维素）作为生物基材料越来越受到人们的关注。然而，它们的环境降解性是一个复杂的问题。每年大约丢弃 4.5 万亿个醋酸纤维素卷烟过滤嘴，这些过滤嘴往往像垃圾一样持久存在。1 相反，许多博物馆藏品中的纤维素基聚合物被发现会迅速腐烂，导致宝贵的文化遗产流失。2 具体的降解机制，例如因为水解脱乙酰化和光解断链是已知的。然而，需要了解这些降解机制在复杂环境中相互作用的方式，才能更好地了解这些材料在自然环境和博物馆中如何降解。3 这是伦敦大学学院可持续遗产研究所和伦敦大学学院可持续遗产研究所之间的合作项目资源旨在了解这些相互作用。除了物理性质的变化之外，还将探索光氧化和水解过程之间的关系。学生将进行加速老化实验，并使用核磁共振 (NMR) 和傅里叶变换红外 (FTIR) 光谱、凝胶渗透色谱 (GPC) 和拉伸测试等分析技术来了解材料性能的变化。该项目预计将对持久性塑料垃圾问题和遗产保护产生重大影响。