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以四氢呋喃为溶剂,通过溶液层离/重组法制备了聚氯乙烯(PVC)/层状双氢氧化物(LDH)纳米复合材料。采用TEM、XRD、FTIR和TGA等手段研究了十二烷基单磷酸根离子(PK)改性的层状双氢氧化物(LDH-PK)及其纳米复合材料的结构与性能,并系统考察了各种制备条件对纳米复合材料结构的影响。XRD和TEM结果表明,剥离型纳米复合材料可通过减少LDH在聚合物中的含量及在四氢呋喃中的浓度和增加层离时间等条件获得;剥离的LDH片层无序的分散在PVC基材中。TGA结果表明,纳米复合材料相比于纯PVC具有更好的热稳定性;以30%失重为比较点,当LDH的质量百分含量为2%时,纳米复合材料的热降解温度比纯PVC高出近16℃,并能显著促进PVC成炭。
Polyvinyl chloride (PVC) / layered double hydroxide (LDH) nanocomposites were prepared by solution delamination / recombination with tetrahydrofuran as solvent. The structure and properties of LDH-PK and its nanocomposites modified by dodecylmonophosphate (PK) were studied by means of TEM, XRD, FTIR and TGA. Effects of various preparation conditions on the structure of nanocomposites. XRD and TEM results show that the exfoliated nanocomposites can be obtained by reducing the content of LDH in the polymer and the concentration in tetrahydrofuran and increasing the delamination time; the exfoliated LDH lamellae are dispersed in the PVC matrix . TGA results show that nanocomposites have better thermal stability than pure PVC; 30% weight loss as a comparison point, when the mass percentage of LDH is 2%, the thermal degradation temperature of the nanocomposites is higher than pure PVC Higher than nearly 16 ℃, and can significantly promote the PVC into charcoal.