摘要:
累托石的表面性质直接影响其在聚合物中的分散性, 进而对其复合材料的结构与性能有很大的影响。通过反气相色谱法, 采用非极性和极性探针研究累托石(REC) , 十二烷基二甲基苄基溴化铵处理的累托石(12-OREC) 和十六烷基三甲基溴化铵处理的累托石(16-OREC) 以及聚氨酯( TPU) 的表面色散能和表面酸碱性, 分析了REC , 12-OREC , 16-OREC 和TPU 的表面性质与其复合材料微观结构的关系。结果发现: REC 表面色散能较高, 表面酸性较强, 在TPU 基体中的分散性较差; 改性后的12-OREC 、16-OREC 色散能明显降低, 且表面呈一定碱性, 在TPU 中的分散性明显改善; 12-OREC 与TPU 的色散能较接近, 酸碱作用参数较匹配, 在TPU 基体中的分散性更优。
Abstract:
The surface properties of rectorite (REC) directly affect the dispersion of rectorite in the polymer mat rixand make a great cont ribution to the st ructure and mechanical properties of composite materials. The inverse gaschromatography ( IGC) was used to investigate the dispersive component of the surface energy (γds) and the surfaceacid-base properties of the native rectorite , organic-modified rectorite with dodecyl benzyl dimethyl ammonium bromide (12-OREC) , organic-modified rectorite with hexadecyl t rimethyl ammonium bromide (16-OREC) and thermoplastic polyurethane ( TPU) with non-polar and polar probes. The correlation of the surface properties of REC andTPU with the st ructure of the composites was analyzed. The result s indicate that the modification of REC lowers it ssurface energy and changes the surface f rom being acidic to being predominantly basic and hence improving the dispersibility of 12-OREC and 16-OREC in TPU ; 12-OREC can achieve the best dispersibility in TPU , because thedispersive energy and acid-base property are most comparable with those of the polymer mat rix.
下载:
