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采用发散式合成法,通过重复以氨基为端基的整代产物与丙烯酸甲酯进行的Mi-chael加成反应和以酯基为端基的半代产物与乙二胺进行的酰胺化反应两个步骤,得到一系列接枝不同代数超支化聚酰胺-胺(PAMAM)分子的改性埃洛石纳米管(HNTs).利用傅里叶变换红外光谱、X射线光电子能谱、X射线衍射、热重分析和透射电镜对产物进行了表征.结果表明:HNTs表面成功接枝了超支化PAMAM,但由于空间位阻的影响,实际接枝率明显小于理论值,第3.0代超支化PAMAM接枝改性HNTs的接枝率达到27.21%;HNTs表面接枝的超支化大分子没有改变埃洛石纳米管的结晶结构.
Using the divergent synthesis method, by repeating the Mi-chael addition reaction of the entire amino-terminated product with methyl acrylate and the amidation reaction of the ester-terminated half-product with ethylenediamine A series of modified halloysite nanotubes (HNTs) grafted with different algebraic hyperbranched polyamidoamine (PAMAM) molecules were obtained by means of Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, Thermogravimetric analysis and transmission electron microscopy showed that the grafted hyperbranched PAMAM was successfully grafted onto the surface of HNTs. However, due to steric hindrance, the grafting rate was significantly less than the theoretical value. The 3.0th generation hyperbranched PAMAM graft The grafting rate of the modified HNTs reached 27.21%. The hyperbranched macromolecules grafted onto the surface of HNTs did not change the crystal structure of the halloysite nanotubes.