Chemical bond formation between polyester and a functional polymeric additive was tried by using multifunctional isocyanate (MFI) as a crosslinking agent. Reactions between desipramine, which is monomer unit of functional polymeric additive, and MFI afforded generation of the corresponding urea type compounds. Accordingly, desipramine-containing copolymers (PAzep-Fl) were prepared as fluorescence functional additives. Chemical bond formations between polyester and PAzep-Fl via MFI were achieved by using liquid type poly( ε-caprolactone) (PCL) as a polyester. The GPC analyses of the composites suggest that chemical bonding occurs between PCL and PAzep-Fl via MFI. The fluorescence ë max of the composites had almost the same wavelength as that of chloroform solution of PAzep-Fl. These results suggest that the fluorescent function of PAzep-Fl is maintained even when a chemical bond is formed between polyester and PAzep-Fl via MFI. 【298】 Fig. 1 Chemical structure of polymers containing diphenylamine with a bridged structure.( 92 ) 【305】

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Investigations of distribution of the carbon carbon triple bond in the moldings were carried out by measurement of Raman spectra. The moldings were prepared by reactive processing of poly (ε caprolactone) (PCL) , bis (4 hydroxymethylphenyl) acetylene(SU)and multifunctional isocyanates (MFI) . The signal derived from SU was changed by the addition method of MFI. When the moldings were prepared without MFI, aggregation of SU to the surface of the molding was observed. The moldings prepared by simultaneous addition of MFI, SU, and PCL showed good dispersibility of SU. In contrast, when the moldings were prepared by addition of prepolymer(synthesized by reaction between MFI and SU)to PCL, heterogeneous distribution of SU which seems to come from aggregation between prepolymers was observed. In addition, the intensity of SU signal in the moldings was not changed by microtome treatment when MFI was used. These results suggested that the distribution of the functional additive in the molding depended on the molding method.

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