Syntheses And Characterization Of Novel Fuctionalized Dendronized Polyamides

Dendronized polymers, consisting of polymers with pendant dendron side chains, are a new class of polymers. They have been used as catalysts, polyinitiators, light harvesting, conducting materials and nanoscopic building blocks because of their nanoscale size, rigidity and functionality. At present, these polymers become more and more interesting in many fields.Novel functionalized dendronized polyamides decorated with a lot of bromomethyl groups in the periphery have been reported by the macromonomer route and for the first time. The resulting polyamides had both a polyamide backbone and polyamide dendrons. A new activating procedure of thionyl chloride as an activating agent was adopted to synthesize the dendrons, macromonomers and polyamides. The works are as follows:1. 3, 5-Diaminobenzoic acid was reacted with bromomethyl bromide to give G1 dendron, and G1 dendron was reacted with 5-aminoisophthalic acid to give G1 macromonomer, and then G1 macromonomer was reacted with 4,4'-oxydianiline to give G1 functionalized dendronized polyamides.2. G1 dendron was reacted with 3, 5-Diaminobenzoic acid to give G2 dendron, and G2 dendron was reacted with 5-aminoisophthalic acid to give G2 macromonomer, and then G2 macromonomer was reacted with 4,4'-oxydianiline to give G2 functionalized dendronized polyamides.3. The structures of the dendrons, the macromonomers and the resulting polyamides were confirmed by Fourier transform infrared and NMR spectral analysis. The molecular weights of the resulting polyamides were measured by GPC, and the data showed that the weight average molecular weights for G1 and G2 functionalized dendronized polyamides were found up to 1.03×105 and 5.01×104, respectively. The structure of the resulting polyamides was characterized by XRD, and it indicated that the resulting polyamides showed an amorphous structure.4. The properties of the resulting polyamides were characterized by solubility behavior test, inherent viscosities test and thermal properties test. The solubility of the the resulting polyamides was improved remarkably and they both could easily dissolve in aprotic polar solvents such as N, N-dimethylformamide (DMF), N, N-dimethylacetamide (DMAc), dimethyl sulfoxide (DMSO), N-methyl-2-pyrrolidone (NMP) and sulfuric acid (H2SO4). The inherent viscosity of the resulting polyamides was low and the resulting polyamides had good thermal properties.