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Degradation of Cellulose-based polymers in complex environments

复杂环境中纤维素基聚合物的降解

基本信息

批准号：
2579341
负责人：
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：
2021
资助国家：
英国
起止时间：
2021 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2579341
关键词：
Degradation Cellulose based polymers complex

项目摘要

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.

纤维素基聚合物如醋酸纤维素作为生物基材料越来越受到关注。然而，它们的环境降解性是一个复杂的问题。每年约有4.5万亿醋酸纤维素香烟过滤嘴被丢弃，这些过滤嘴通常会作为垃圾持久存在。1相反，许多博物馆收藏的纤维素基聚合物被观察到迅速腐烂，导致宝贵的文化遗产损失。2已知特定的降解机制，如水解脱乙酰和光解断链。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，以更好地了解这些材料在自然环境和博物馆中如何降解。光氧化和水解过程之间的关系将被探讨，除了伴随的物理性质的变化。学生将进行加速老化实验，并使用分析技术，如核磁共振（NMR）和傅里叶变换红外（FTIR）光谱，凝胶渗透色谱（GPC）和拉伸测试，以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。