Aromatic amine-containing polymer structures

In order to demonstrate the use of laser flash photolysis in elucidation of the MDI based polyurethane photolysis mechanism, three polyurethanes, two aryl biscarbamate models, an aryl monocarbamate model, and an aromatic amine were selected. Two of the polyurethanes are based on MDI while the third is based on TDI (mixture of 2,4 and 2,6 isomers in 80/20 ratio). The MDI based polyurethanes all have the same basic carbamate repeat unit. The MDI elastomer (MDI-PUE) is soluble in tetrahydrofuran (THF). The simple polyurethane (MDI-PU) based on MDI and 1,4-butanediol is used in the tert-butoxy abstraction reactions since it does not contain a polyether backbone. (See page 47 for structures of polymers and models.)... 

Of special practical interest in spinning from solution of some polymers may become the macroradicals reactions with aromatic diamines. In this way, chemically modified polymers -containing free aromatic aminic-groups may be obtained. In their turn, they may be either diazotized or coupled with phenols or tertiary mixtures of amines, azoic structures being thus formed at the ends of the macromolecular chains. Depending on the chemical nature of the coupling agent employed, different colorations may results ... 

Epoxy resins are among the most important of the high performance thermosetting polymers and have been widely used as structural adhesives and matrix for fiber composites. Epoxy resins are characterized by the presence of epoxide groups before cure, and they may also contain aliphatic, aromatic, or heterocyclic structures in the backbone. The epoxy group can react with amines, phenols, mercaptans. 

This strategy provides a facile way for the construction of hypercrosslinked polymers with unique micro-morphology structures or special performances. Dawson et al. successfully synthesized a series of MOPs containing -NH2 groups by the copolymerization of a simple amine-functionalized aromatic monomer (aniline) with benzene (Figure 4.11). Despite the non-porous network synthesized solely by aniline, the strategy of copolymerization with benzene was used to fine tune the porous properties and finally obtain the networks with apparent BET surface areas of up to 1100 m g . Moreover, the increasing aniline content in the hypercrosslinked networks led to an improved CO2/N2 selectivity of up to 49.2 1 but, as a contrast, the 100% benzene network only showed a CO2/N2 selectivity of 15.9 1. 

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