Zhang Wanjing, Wang Liyan, Chen Hong, Guo Liying, Bai Yaoyao, Qian Xin
School of Petrochemical Engineering, Shenyang University of Technology Liaoyang 111003 P. R. China
Liaoning Shengda Environmental Resource Group Co., Ltd Liaoyang 111003 P. R. China
RSC Adv. 2024 Jul 29;14(33):23662-23671. doi: 10.1039/d4ra03174a. eCollection 2024 Jul 26.
A series of 2-methyl-1,3-propanediol (MPO) modified azelaic acid and hexylene glycol copolyester (PHMAZ) plasticizers with varying contents were synthesized using a direct esterification melt polycondensation method, and their structures were characterized systematically. Analysis using infrared spectroscopy and nuclear magnetic resonance spectroscopy confirmed the synthesis of the designed copolyester structure. Gel permeation chromatography (GPC) tests indicated that the number average molecular weight of each copolyester sample ranged between 2000 and 3000. These copolyesters were used to plasticize polyvinyl chloride (PVC) resin, and the glass transition temperature of the plasticized PVC samples was tested using a differential scanning calorimeter (DSC). Further characterization of the plasticizing effects was conducted using an electronic universal testing machine. The research results showed that as the content of MPO increased, the plasticizing effect of the copolyester initially increased and then decreased. Specifically, the copolyester containing 45% MPO, PHMAZ-45, demonstrated the best plasticizing effect on PVC, with the glass transition temperature of the plasticized PVC system around -35 °C, elongation at break at 908.4%, and a plasticizing efficiency of 254.5%. Additionally, this new type of copolyester plasticizer uses bio-based raw materials, exhibits excellent plasticizing effects, and the preparation process is stable and controllable. It holds promising potential to replace traditional volatile and toxic phthalate esters, presenting significant industrial application value.
采用直接酯化熔融缩聚法合成了一系列不同含量的2-甲基-1,3-丙二醇（MPO）改性壬二酸与己二醇共聚酯（PHMAZ）增塑剂，并对其结构进行了系统表征。通过红外光谱和核磁共振光谱分析证实了所设计共聚酯结构的合成。凝胶渗透色谱（GPC）测试表明，每个共聚酯样品的数均分子量在2000至3000之间。这些共聚酯用于增塑聚氯乙烯（PVC）树脂，并使用差示扫描量热仪（DSC）测试了增塑PVC样品的玻璃化转变温度。使用电子万能试验机对增塑效果进行了进一步表征。研究结果表明，随着MPO含量的增加，共聚酯的增塑效果先增大后减小。具体而言，含45% MPO的共聚酯PHMAZ-45对PVC的增塑效果最佳，增塑PVC体系的玻璃化转变温度约为-35℃，断裂伸长率为908.4%，增塑效率为254.5%。此外，这种新型共聚酯增塑剂采用生物基原料，具有优异的增塑效果，制备过程稳定可控。它有望替代传统的挥发性有毒邻苯二甲酸酯，具有重要的工业应用价值。
