Rare earth Ce based metal organic framework as efficient synergistic thermal stabilizer for PVC: Preparation and thermal stabilization behavior
Rare earth Ce based metal organic framework as efficient synergistic thermal stabilizer for PVC: Preparation and thermal stabilization behavior
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DOI：
10.1016/j.tca.2022.179365
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发表时间：
2022-10-11
影响因子：
3.5
通讯作者：
Yuan, Shouqi
中科院分区：
文献类型：
--
作者：
Wang, Mei;Wu, Tong;Yuan, Shouqi
生产工艺复杂、性能参差不齐严重制约了稀土热稳定剂的应用。本研究研究了金属有机骨架Ce(1,3,5-BTC)(H2O)6 (Ce-BTC)对PVC的热稳定性行为。实验结果表明，Ce-BTC、2,4,6-三[二(羟甲基)氨基]-1,3,5-三嗪(HHTT)和ESBO协同稳定PVC样品的组合表现出显着改善的初始颜色，同时，Ts和“锌烧”时间也分别延长至55.17和70分钟。在热处理过程中，HHTT可以取代PVC链上不稳定的氯原子，而Ce-BTC中不完全配位的Ce离子可以与PVC降解产生的烯烃链反应，抑制共轭多烯的进一步聚合，这两个因素协同抑制PVC的降解。 HHTT和ESBO对HCl的中和可以为不完全配位的Ce离子和氯原子提供更长的反应时间，延缓HCl的自催化作用。
The complex production process and uneven performance seriously restrict the application of Rare earth thermal stabilizer. In this study, the thermal stability behavior of metal organic framework Ce(1,3,5-BTC)(H2O)6 (Ce-BTC) towards PVC was studied. Experimental results showed that the combination of Ce-BTC, 2,4,6-tris[di (hydroxymethyl) amino]-1,3,5-triazine (HHTT), and ESBO synergistically stabilized PVC sample displayed significantly improved initial color, meanwhile, the Ts and the time of "zinc burning" were prolonged to 55.17 and 70 min, respectively, as well. During thermal treatment, HHTT can replace the unstable chlorine atoms on the PVC chain, and the incompletely coordinated Ce ions in Ce-BTC can inhibit the further polymerization of conjugated polyenes by reacting with the alkene chain resulted from PVC degradation, these two factors syn-ertistically inhibit the degradation of PVC. The nertralization of HCl by HHTT and ESBO can provide longer reaction time for incompletely coordinated Ce ions and chlorine atoms, delaying the autocatalytic effect of HCl.