| Summary: | 碩士 === 國立中興大學 === 化學工程學系所 === 99 === In this study, a bifunctional building block compound,4-isocyanato- 4’(3,3-dimethylazetidine-2,4-dione)diphenylmethane (IDD) was used as a building block to synthesize a series of novel polyurethane/malonamide dendrons with two alternating peripheral functional groups (azobenzene chromophore and stearyl group) via a convergent route. All of the dendrons (G1, G2, G3,) exhibited structural characteristics with secondary amines located on one end. With this feature, the amine salt was easily formed by the addition of hydrochloric acid. Subsequently, the amine salt proceeded to ion-exchange with Na+-MMT. By respective incorporation of the different generations of dendrons onto layered MMT, the interlayer distance of the intercalated hybrid could be precisely controlled to form a unique structure with the possibility of self-assembly. These dendrons (G1、G2 and G3) with peripheral chromophore-atlternating-stearyl group were utilized to intercalate layered silicates, resulting in a large d-spacings of 57Å or exfoliation morphology. After blending the organoclays with a high glass transition temperature (Tg) polyimide (Tg, 271 oC), respectively, the interactions between the hydrogen bond-rich dendrons and polyimide in the layered confinement resulted in ordered morphology, i.e. optical nonlinearity.
Furthermore，we also synthesized a rather rigid building block, 1-(4-isocyanatophenyl)-3,3-dimethylazetidine-2,4-dione (IPDA) for the sake of comparison
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