PVC增塑剂偏苯三酸基聚酯的研究

采用“二步法”将偏苯三酸酐（TMA）和甘油（Gl）经酯化、缩聚反应得到环保、可生物降解的偏苯三酸聚酯（P-Gl-TMAI）。将合成的P-GI-TMAI与邻苯二甲酸（2-乙基己基）酯（DOP）分别添加到聚氯乙烯（PVC）树脂中进行塑炼实验，研究2种增塑剂与PVC树脂的相容性能、塑炼试片的力学性能以及耐迁移性能。结果表明，与DOP相比，P-Gl-TMAI与PVC的相容性较好；且前者塑炼试片的拉伸强度达18.99 MPa，断裂伸长率为454.89 %；在挥发性和抽出性试验中，P-Gl-TMAI制备的试片分别仅有3.02 %和15.31 %的质量损失率，其韧性与耐迁移性均高于DOP。

Study of Trimellitic Acid Polyester for PVC Plasticizer

In this study, an ecological-friendly and biodegradable trimellitic acid polyester (P-Gl-TMAI) plasticizer was synthesized by the esterification and polycondensation reactions between trimellitic anhydride (TMA) and glycerin (GI). The as-prepared P-GI-TMAI was introduced into poly(vinyl chloride) (PVC) resin, and then the compatibility, mechanical properties and migration résistance of the resulting compounds were investigated. Moreover, the dioctyl phthalate (DOP) plasticizer as a reference was also used for a comparative investigation. Compared to DOP, P-GI-TMAI exhibited some small holes on the surface of test panel, indicating that P-GI-TMAI was more compatible with PVC. The PVC compound plasticized by P-GI-TMAI achieved the tensile strength of 18.99 MPa and elongation at break of 454.89 %. The results obtained from volatility and extraction tests indicated that there were only 3.02 % and 15.31 % of mass-loss rate for the compounds plasticized by P-GI-TMAI, indicating much better impact and migration resistance that those by DOP.