Preparation and properties of nano-montmorillonite/ polymer ( styrene-co-divinylbenzene) composite by suspension polymerization
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摘要: 采用悬浮聚合法制备了纳米蒙脱土/聚合物(苯乙烯-共聚-二乙烯基苯) 复合材料。钠基蒙脱土(SMMT) 经十六烷基三甲基溴化铵(CTAB) 离子交换后获得有机蒙脱土(OMMT) 。采用XRD 和FTIR 分析表征了有机蒙脱土的结构与性能。通过XRD、TEM、SEM、和FTIR 对复合材料微观结构进行了表征; 通过热重分析仪( TG) 对复合材料的热稳定性能进行了研究。讨论了蒙脱土含量和交联剂用量对复合材料热稳定性能的影响。结果表明, 钠基蒙脱土的层间距为1. 48 nm , 经有机改性蒙脱土的层间距为2. 85 nm , 纳米蒙脱土/聚合物复合材料的层间距约为4 nm; 纯聚苯乙烯最大质量损失温度为399 ℃, 当蒙脱土含量为5 %、交联剂用量为10 %时, 纳米蒙脱土/聚合物最大质量损失温度提高到437 ℃。在实验条件下, 纳米蒙脱土/聚合物复合材料具有更好的热稳定性能。Abstract: The organic nano-montmorillonite (OMMT) /poly ( styrene-co-divinylbenzene , St ) composites were prepared by suspension polymerization. OMMT was prepared by the ionexchange method between sodium montmorillonite (SMMT) and cetylt rimethyl ammonium bromide (CTAB) in an aqueous solution. The character and structure of OMMT were revealed by XRD and FTIR. The microstructure of composites was characterized by XRD, TEM, SEM and FTIR. The thermal stability of composites was studied by TG. The effect of the amount of OMMT and divinylbenzene (DVB) on the thermal stability of composites was discussed. The results indicate that the maximum interlayer spacing is 1. 48 nm for SMMT, 2. 85 nm for OMMT and about 4. 0 nm for OMMT/polymer. The maximum decomposed temperatures are 399 ℃ for the pure polystyrene and 437 ℃ for composites with montmorillonite mass f raction of 5 % and DVB content of 10 %. The crosslinked composites exhibit drastic improvements in hermal stability under the experimental conditions.
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Key words:
- suspension polymerization /
- montmorillonite /
- divinylbenzene /
- styrene /
- composites
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