Modulating effect of Mg-Al-CO3 layered double hydroxides on the thermal stability of PVC resin

被引:135
作者
Lin, YJ [1 ]
Li, DQ [1 ]
Evans, DG [1 ]
Duan, X [1 ]
机构
[1] Beijing Univ Chem Technol, Key Lab Sci & Technol Controllable Chem React, Minist Educ, Beijing 100029, Peoples R China
关键词
layered double hydroxide; hydrotalcite; PVC; thermal stability; stabilizer;
D O I
10.1016/j.polymdegradstab.2004.11.007
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Mg-Al-CO3 layered double hydroxides (hydrotalcite-like materials) with different Mg/Al molar ratios and having small particle size and narrow size distribution have been prepared by a method involving separate nucleation and aging steps and characterized by XRD, FT-IR and TG-DTA, which clearly demonstrated that the charge density of the layers decreased with increasing Mg/Al molar ratio. Therefore, the electrostatic force of attraction between layers and interlayer counter-ions as well as the driving force for anion exchange decreased. Varying amounts of Mg-A1-CO3 layered double hydroxides with different Mg/Al molar ratio were mixed with PVC resin. Thermal aging tests of the resulting PVC composites were carried out in a thermal aging test box at 180 +/- 1 degrees C by observing the colour change of the samples. The results showed that Mg-Al-CO3 layered double hydroxide with Mg/Al=2 has the best stabilizing effect on PVC because of its higher layer charge density and consequent stronger driving force for uptake of Cl- in the interlayer galleries. Uptake of Cl- inhibits the autocatalytic dehydrochlorination of PVC which is responsible for its degradation. The optimum loading of layered double hydroxides was determined. (c) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:286 / 293
页数:8
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