油脂基超支化聚酯反应型增塑剂的多级结构构筑及其增塑机制

林木资源化学转化制备生物基增塑剂，对于实现增塑剂的环保与安全化，促进林木生物质低成本高值化的大规模利用具有重要的应用基础科学价值。针对外增塑剂易迁移、传统反应型增塑剂增塑效率低的问题，本项目依据木本油脂源高级脂肪酸的分子结构特点，运用巯基-烯点击反应、可控修饰等新技术，设计构筑含多级端基结构的油脂基超支化聚酯反应型增塑剂，阐明端基结构中活性巯基及功能基团的耦合关系及其调控机制，研究增塑剂的相容性、增塑效率、迁移性及协同热稳定性，探索增塑剂的拓扑结构、分子量及分布、端基多级结构构成等因素对自由体积及增塑效率的影响规律，探析增塑剂与PVC大分子间的共价键和非共价键交互作用，揭示油脂基超支化反应型增塑剂的分子结构与增塑性能的构效关系，阐释其增塑作用机制，研究结果将为研制高性能、多功能的生物基环保增塑剂提供理论依据。

This project focuses on the chemical conversion of forest resources for the preparation of bio-based plasticizers, which will help to develop environmental friendly plasticizers and have potential industrial application for using forest biomass at low cost and in high efficiency. The problems of easy migration of external plasticizers and low plasticizing efficiency of traditional reactive plasticizers hamper the development of the plasticizers. In this project, we aim to design and synthesize new oil-based hyperbranched polyester reactive plasticizer with multi-stage end group structure according to the molecular structure of fatty acids derived from woody oils. The new technologies such as thiol-ene click reaction and controllable modification will be used. For this goal, we propose to clarify the coupling relationship between active thiol groups and functional groups in the end group structure and its regulation mechanism; to study the compatibility, the plasticizing efficiency, the migration and the synergistic thermal stability and other plasticizing effects of plasticizers; to investigate the effects of different topological structures, molecular weights and distributions, multi-level structure of end groups on free volume and plasticization efficiency; to discuss the covalent bonds and non covalent bonds interactions between plasticizers and PVC macromolecules; to reveal the structure-activity relationship between the molecular structure and plasticizing properties of oil-based hyperbranched reactive plasticizers; to explain the plasticizing mechanism. The research results will provide a theoretical basis for the design of high-performance, multi-functional and environmental friendly bio-based plasticizers.