Highly concentrated, intercalated silicate nanocomposites: Synthesis and characterization
Highly concentrated, intercalated silicate nanocomposites: Synthesis and characterization
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DOI：
10.1021/ma0213450
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发表时间：
2003-02
期刊：
影响因子：
5.5
通讯作者：
Adam S. Zerda;T. Caskey;A. Lesser
中科院分区：
文献类型：
--
作者：
Adam S. Zerda;T. Caskey;A. Lesser
PMMA 层状硅酸盐插层纳米复合材料是使用超临界二氧化碳 (scCO2) 合成的，可生产具有显着增强效果的有序材料。 scCO2 用于均匀分布单体并充当 MMA 聚合的低粘度溶剂。该路线可以合成含有大量有机改性层状硅酸盐（OMLS）的纳米复合材料。低于 40 wt% OMLS，插层纳米复合材料表现出与完全延伸的表面活性剂链的尺寸相称的 d 间距。 OMLS 超过 40 wt% 时，复合材料体积被无机材料饱和，并且 d 间距减小以均匀分布聚合物体积。提出了估计该转变浓度的模型。在接近均匀插层形态的浓度下，研究了复合材料的基本机械和物理性能。
PMMA-layered silicate intercalated nanocomposites are synthesized using supercritical carbon dioxide (scCO2) to produce ordered materials with significant levels of reinforcement. The scCO2 is used to homogeneously distribute monomer as well as act as a low-viscosity solvent for MMA polymerization. This route allows for synthesis of nanocomposites containing significant levels of organically modified layered silicates (OMLS). Below 40 wt % OMLS, the intercalated nanocomposites exhibit a d spacing commensurate with dimensions of the fully extended surfactant chains. Above 40 wt % OMLS, the composite volume is saturated with inorganic material, and the d spacing decreases to homogeneously distribute the polymer volume. A model for estimating this transition concentration is presented. At concentrations approaching the homogeneously intercalated morphology, the basic mechanical and physical properties of the composite are investigated.