Ahmad Mansor Bin, Gharayebi Yadollah, Salit Mohd Sapuan, Hussein Mohd Zobir, Shameli Kamyar
Department of Chemistry, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia; E-Mails:
Int J Mol Sci. 2011;12(9):6040-50. doi: 10.3390/ijms12096040. Epub 2011 Sep 19.
In this paper, Polyimide/Montmorillonite Nanocomposites (PI/MMT NCs), based on aromatic diamine (4-Aminophenyl sulfone) (APS) and aromatic dianhydride (3,3',4,4'-benzophenonetetracarboxylic dianhydride) (BTDA) were prepared using in situ polymerization and solution-dispersion techniques. The prepared PI/MMT NCs films were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The XRD results showed that at the content of 1.0 wt % Organo Montmorillonite (OMMT) for two techniques and 3.0 wt % OMMT for the in situ polymerization technique, the OMMT was well-intercalated, exfoliated and dispersed into polyimide matrix. The OMMT agglomerated when its amount exceeded 10 wt % and 3.0 wt % for solution-dispersion and in situ polymerization techniques respectively. These results were confirmed by the TEM images of the prepared PI/MMT NCs. The TGA thermograms indicated that thermal stability of prepared PI/MMT NCs were increased with the increase of loading that, the effect is higher for the samples prepared by in situ polymerization technique.
在本文中，基于芳香二胺（4-氨基苯砜）（APS）和芳香二酐（3,3',4,4'-二苯甲酮四羧酸二酐）（BTDA），采用原位聚合法和溶液分散法制备了聚酰亚胺/蒙脱土纳米复合材料（PI/MMT NCs）。通过X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、透射电子显微镜（TEM）和热重分析（TGA）对制备的PI/MMT NCs薄膜进行了表征。XRD结果表明，对于两种方法，当有机蒙脱土（OMMT）含量为1.0 wt%时，以及对于原位聚合法，当OMMT含量为3.0 wt%时，OMMT能够很好地插层、剥离并分散到聚酰亚胺基体中。当溶液分散法和原位聚合法中OMMT的量分别超过10 wt%和3.0 wt%时，OMMT会发生团聚。制备的PI/MMT NCs的TEM图像证实了这些结果。TGA热重曲线表明，制备的PI/MMT NCs的热稳定性随着负载量的增加而提高，原位聚合法制备的样品的效果更明显。
