M. B. H. Othman, Z. Ahmad, H. Osman
Jan 11, 2017
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0
Influential Citations
4
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Journal
Journal of King Saud University - Science
Abstract
Abstract In this paper, a highly chemical stable 4,4′,4″-((1,3,5-triazine-2,4,6-triyl)tris(oxy))trianiline (TTA) was successfully synthesized with 4,4′-(4,4′-Isopropylidene-diphenoxy)bis(phthalic anhydride) (BPADA) using direct nucleophilic addition in Dimethylformamide (DMF). The resulting Hyperbranched Polyimide (HPI) was characterized by means of conventional methods such as Fourier transform infra-red (FT-IR) and proton nuclear magnetic resonance ( 1 H NMR) spectroscopy, gel permeation chromatography (GPC), solubility tests, Field Emission Scanning Electron Microscopy (FESEM), Electron Diffraction X-ray analysis (EDX), Vickers hardness test, thermogravimetric analysis (TG), differential scanning calorimetry (DSC), and thermal conductivity. High molecular weight was obtained by extending the reaction time for 2 h. The TTA/BPADA HPI demonstrated a high chemical stability and could be readily used in the precursor state. The thermal curing led to an increase of the imidization degree and greatly improved the thermal stability ( Tg above 200 °C, maximum mass loss >500 °C and char yield >55%), due to an increasing chain packing density). Therefore, it is believed that this incorporated HPI structure containing s-triazine moieties in a polyimide system shows potential as a new high performance and highly functional material.