为解决PVC本体加工性能及热稳定性均差、而共混型增塑剂改性PVC时易出现迁移及析出等问题，本项目采用具有柔性长碳链结构的木本油脂为原料，利用三聚氰胺或三聚氰酸为基本碳骨架，通过环氧化、缩合、开环加成等反应合成新型的亲核性改性剂——木本油脂源巯基三嗪类化合物(MTNR)，以其键合至PVC本体，设法消除或者取代PVC本体上的活性氯，达到提升PVC本体热稳定性及可塑性、降低共混型增塑剂用量的目的。利用刚果红法、迁移性测试、动态热机械分析等手段，评价改性PVC材料热稳定性、塑化性能、力学性能、迁移性等，结合自由体积理论、自由基机理、分子-离子机理等理论，探究MTNR分子结构与PVC材料热稳定性及力学性能间的构效关系，重点研究改性PVC分子链段中硫元素、三嗪氮杂环、长链柔性结构和多羟基的引入对PVC热稳定性和塑性的影响及作用机理。本研究为PVC本体改性提供理论依据，有利于推动林特资源的高附加值利用。

The processing performance and thermal stability of polyvinyl chloride (PVC) are poor. Mixing PVC with plasticizers improves the processing performance of PVC. However, a lot of blend PVC plasticizers are easy to migrate out. The present project plans to eliminate or replace the active chlorine to improve the plasticity and thermal stability of the PVC itself, and reduce the use of plasticizers. This project will prepare mercapto-triazine nucleophilic reagents (MTNR) with woody oil derivatives with long-chain flexible structures, melamine and cyanuric acid by epoxidation, a condensation reaction, and a ring-opening addition reaction. Subsequently, MTNR will be used to modify PVC using a nucleophilic substitution reaction. The thermal stability, plasticizing performance，mechanical and migration properties of modified PVC samples will be determined using Congo red test, migration test, dynamic thermomechanical analysis(DMA), and the like. Many different kinds of mechanism, including free-volume theory, free radical and mixed ion-radical have been proposed. According to the integration of the performance analysis and PVC degradation and plasticizing mechanism, this project will discuss the relationships between the MTNR structures and the thermostability and mechanical properties, and examine the collaborative mechanism in detail. It will focus on how the introduction of sulfur, triazine heterocyclic nitrogen, long-chain flexible structures, and polyhydroxyl into MTNR affects PVC thermostability and plasticity. This project aims to develop a compound which can improve the plasticity and thermal stability of the PVC itself, and to provide theoretical basis for PVC modification. This work will promote higher-value utilization of the forestry resources.