Abstract
A quaternized ammonium photoinitiator was synthesized via Michael-addition reaction and quaternization reaction, then ion-exchanged with montmorillonite (MMT). An ordered swollen structure of the intercalated montmorillonite was confirmed by X-ray powder diffraction (XRD) and thermogravimetric analysis (TGA). UV–vis absorption spectroscopy was employed to investigate the maximal absorption of photoinitiator and the intercalated montmorillonite. The modified montmorillonite was then mixed with urethane acylate oligomer (CN964) and tripropylene glycol diacrylate (TPGDA) to form Polyurethane/montmorillonite nanocomposites by photopolymerization. The photopolymerization kinetics was monitored by real time infrared spectroscopy (RTIR). The X-ray diffraction and transmission electron microscopy (TEM) results revealed that the modified montmorillonite was exfoliated and dispersed in parallel alignments as multilayers in the organic matrix.
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