广泛存在于各类水环境中的“微塑料”已对生态环境、生物多样性、人类健康构成重大威胁。基于环境友好、优异综合性能的PPDO，发展可无害化降解的高分子材料以替代不可降解的通用高分子材料，是解决“微塑料”水环境污染最有希望的策略之一。然而，PPDO面临在使用储存时的快速降解这一难题，使其至今未在通用材料领域得到实际应用。本项目基于差别化结构设计并结合多种合成策略，通过聚合物亲疏水性、结晶性及酯键催化水解的调控，设计合成具有可控无害化降解性的新型PPDO基脂肪族聚酯。研究合成方法与工艺及其对聚合物结构的影响，掌握聚合物的可控合成方法。揭示聚合物拓扑结构、化学组成、成键情况等对其降解性能、力学性能的影响规律，建立构效关系。揭示聚合物在各种模拟水环境中的降解动力学规律与机理模型，评价聚合物及其降解产物对真实水环境和水生物的影响。为PPDO的实用化奠定科学基础，为“微塑料”污染防治提供理论指导与技术支持。

The microplastics which widely exist in various water environments have posed a significant threat to the ecological environment, biodiversity and human health. Based on the eco-friendly and good performance PPDO, the development of harmlessly degradable polymer materials to replace non-degradable universal polymer materials is one of the most promising strategies to solve the water environmental pollution of "microplastics". However, PPDO is faced with a significant problem of rapid degradation in the use and storage. Thus PPDO has not been applied in the field of general materials. Based on the synthesis strategies of differential molecular and topological structure designs and a variety of synthetic strategies, through the regulation of polymer crystallinity, hydrophilic-hydrophobic property and ester-bond catalytic hydrolysis, we will design and synthesize a series of PPDO-based aliphatic polyester with a controlled harmless degradation property. The method and process of synthesis and its effect on polymer structure will be studied. The controlled synthetic method of polymer will be acquired. The effects of topological structure, chemical composition and bonding type of polymers on their degradation and mechanical properties will be revealed, and the relationship of structure-property will be established. The degradation kinetics and mechanism of polymers in various simulative water environments will be revealed, and the effects of polymers and their degradation products on real water environment and its biology will be evaluated. Finally, the relationships among molecular structure, service performance, degradation performance and environmental effect can be clarified. Accordingly, this project could lay a scientific foundation for the practical application of PPDO and provide theoretical guidance and technical support for the prevention of microplastics pollution.