Influence of Zeolitic imidazolate framework-8 on the thermal stabilization of poly(vinyl chloride)
Influence of Zeolitic imidazolate framework-8 on the thermal stabilization of poly(vinyl chloride)
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DOI：
10.1016/j.polymdegradstab.2018.01.022
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发表时间：
2018-03
影响因子：
5.9
通讯作者：
Mei Wang;Xianghai Song;Jianchun Jiang;Jianling Xia;Mei Li
中科院分区：
文献类型：
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作者：
Mei Wang;Xianghai Song;Jianchun Jiang;Jianling Xia;Mei Li
以化学计量比硝酸锌和2-甲基咪唑为原料，在氢氧化铵存在下室温合成了分子筛咪唑骨架材料(ZIF-8)。用一系列方法对该材料进行了表征，并将其用作聚氯乙烯(PVC)薄膜的热稳定剂。通过刚果红试验、热老化试验和热重分析(TGA)对稳定后的聚氯乙烯的性能进行了研究。与一些常用的参考稳定剂(如CaSt2和ZnSt2)的稳定效果相比，含有ZIF-8[如CaSt2/ZSt2/ZIF-8和ZnSt2/ZIF-8]的稳定剂对PVC具有更好的初始颜色稳定性和长期热稳定性。在180 °C下，复合材料的静态热稳定时间从33.13min延长到128.92 ，这主要归功于ZIF-8和ZnSt2的协同作用。在聚氯乙烯降解过程中，ZIF-8的咪唑配体对氯化氢有很强的吸附作用，并与由氯化锌生成的氯化锌形成络合物。此外，ZIF-8的双键可能有助于与多烯形成稳定的化合物，进一步延缓聚氯乙烯的降解。研究了聚氯乙烯薄膜的动态力学性能和拉伸性能。
A zeolitic imidazolate framework material (ZIF-8) was prepared from stoichiometric zinc nitrate and 2-methylimidazole at room temperature in the presence of ammonium hydroxide. The material was characterized by a series of methods and used as a thermal stabilizer for poly (vinyl chloride) (PVC) film. The properties of the stabilized PVC were investigated using Congo red test, thermal aging test and thermal gravimetric analysis (TGA). Compared with the stabilizing efficiencies of some commonly-used reference stabilizers (e.g. CaSt2and ZnSt2), the stabilizers including ZIF-8 [such as CaSt2/ZnSt2/ZIF-8 and ZnSt2/ZIF-8] exhibit better initial color stability and long-term thermal stability for PVC. The static thermal stability time was significantly prolonged from 33.13 min for PVC/CaSt2/ZnSt2to about 128.92 min for PVC/ZIF-8/ZnSt2at 180 °C. The superior performance is attributed to the synergistic effect of ZIF-8 and ZnSt2. The imidazole ligand of ZIF-8 can strongly absorb hydrogen chloride and form complexes with ZnCl2generated from ZnSt2in the PVC degradation process. In addition, the double bonds of ZIF-8 may help to form stable compounds with polyenes to further retard the PVC degradation. Dynamic mechanical and tensile properties of the PVC films were also studied.