Analysis of Molecular Aggregation Structures of Fully Aromatic and Semi-aliphatic Polyimide Films with Synchrotron Grazing Incidence Wide Angle X-ray Scattering

Abstract

The intermolecular aggregation structures of fully aromatic polyimides (Ar-PIs) prepared from pyromillitic dianhydride (PMDA) and those of semialiphatic polyimides (Al-PIs) from 4,4'-diamino-cyclohexylmethane (DCHM) were characterized by a grazing incidence wide-angle X-ray scattering (GIWAXS) technique. The aggregation structures of both Ar- and Al-PI thin films formed on Si substrates were identified as a mixture of it liquid-crystalline-like ordered domain and an amorphous matrix. For Ar-PIs whose glass transition temperatures (T-g) are higher than the imidization temperature (T-i), the aggregation structures are significantly influenced by the three-dimensional structures of the PI chain. Rodlike molecular structures with high planarity are prerequisites for the growth of ordered domains of Ar-PIs, whereas an Ar-PI having a bent and nonplanar structure displays the highest intensities of an amorphous halo. In addition, the bulky -CF3 groups in the diamine moiety increase the interchain distance in the ordered domains. On the other hand, for Al-PIs whose T(g)s arc lower than T-i, the degrees of interchain ordering in the ordered domains were higher than those of Ar-PIs, but the orientation of the ordered domains was decreased significantly by decreasing their T(g)s. This is due to the vigorous motion of PI chains during thermal imidization.