Synthesis and characterization of dendronized aromatic polyamides with bromomethyl groups in the periphery

Abstract

This paper focused on the synthesis of novel functionalized dendronized aromatic polyamides, which contained a polyamide backbone and polyamide dendrons decorated with bromomethyl groups, by the macromonomer route. The new activating procedure of the synthesis of dendrons and macromonomers using thionyl chloride as an activating agent eliminated the protection/deprotection procedure and reduced side reactions. The structures of the dendrons, macromonomers, and polyamides were confirmed by FTIR, 1 H NMR, 13 C NMR, and elemental analysis. The properties of the resulting dendronized polyamides, which were compared with that of the linear polyamide (LP), were studied using GPC, XRD, TGA, DSC, inherent viscosity measurement, and solubility experiment.

Theoretical Study on the Size and the Shape of Linear Dendronized Polymers in Good and Selective Solvents

“…This phenomenon is of great scientific and technological interest because it shows that small dendron repulsions is a way to overcome the solubility problem of the otherwise insoluble macromolecules with u bb attractions, like the conjugated polymers 27 or polyamides in various solvents. 28 In parts c and d of Figure 3, R b is plotted against g. A first thing to notice is that the small linear-like increase of R b for small g suddenly becomes essential at certain g depending on the rest parameters, a property which is due to the dendritic character of grafted dendrons. This characteristic behavior of the dendritic polymer structures 22 indicates that the presence of the dendritic side chains becomes more and more significant as g increases, which can be explained by the exponential increase of the interacting units of the dendrons with g and thus by the significant increase of their total excluded volume effects.…”

“…No collapse of the backbone does occur in a dendron selective solvent (reverse triangles), with u bb = u db = −0.1 but u dd = 0.1 positive. This phenomenon is of great scientific and technological interest because it shows that small dendron repulsions is a way to overcome the solubility problem of the otherwise insoluble macromolecules with u bb attractions, like the conjugated polymers or polyamides in various solvents …”

Synthesis of a branched poly(phenylene ethylene) with bromomethyl groups as an organosoluble and functional parylene

“…The fact that BPPEs possess a very large number of unreacted Ph‐CH 2 Br groups26–35 is of particular interest in the study of functional polymers. To confirm whether 6 can be made functional, we carried out a simple polymerization reaction and attempted to improve the thermal stability and processability of the obtained polymer.…”

“…The results of GPC analysis showed that M n of 7 was 7100 (PDI = 3.2), suggesting that 7 was obtained without degradation of the original polymer chain (in this reaction, M n and PDI of 6 were 4400 and 2.7, respectively). This suggests that BPPEs are highly reactive functional polymers 26–31…”

Διαμορφωτικές Ιδιότητες Δενδριτικών Πολυμερών

“…[10] Στα σχήματα 4. ενδιαφέρον, διότι κατά αυτό τον τρόπο δύναται να ξεπεραστούν προβλήματα διαλυτότητας ορισμένων, κατά τα άλλα, αδιάλυτων πολυμερών, όπως είναι ορισμένα συζυγή πολυμερή [84,85] και πολυαμίδια σε διάφορους διαλύτες. [86] Στα σχήματα 4. Στο σχήμα 4.5 βλέπουμε τον δεσπόζοντα ρόλο που παίζει η ποιότητα του διαλύτη των δένδρων στις διαμορφώσεις του κορμού.…”