Hydrothermal polymerization towards fully biobased polyazomethines

Abstract

<p>Microwave assisted polycondensation for the synthesis of (partially) biobased polyazomethines in water (hydrothermal polymerization) was investigated for the first time in this study. The polyazomethines prepared via this environmetanlly friendly...</p>

An evaluation of activation energy, surface area, and catalytic activity relationship of the developed nonmetal alloy decorated Schiff's base based conjugated conductive polymer composite electrodes for fuel cell applications

“…The absorption frequencies appeared at 1487 and 2874 cm À1 infer the existence of stretching vibration of C═C aromatic benzene ring and aromatic C H bond, respectively. 47 Thus, the data obtained from FTIR studies can be used to confirm the formation of Schiff's base based conductive polymer (CSP)-palm flower carbon (PC) composite, and Schiff's base based conductive polymer from terephthalaldehyde and p-phenylenediamine.…”

Hydrothermal polymerization of porous aromatic polyimide networks and machine learning-assisted computational morphology evolution interpretation

“…28 HT conditions have been shown to promote crystallinity in small molecules, 27,29 linear polyimides, 16,28,30,31 polyamide networks, 22 or at least semi-crystallinity in PI/SiO 2 hybrid materials and linear polybenzimidazoles and BBB. 24,31 To date, monomers used in HTP were mainly difunctional aromatic monomers, i.e., aromatic dianhydrides, 16,28,31 aromatic diamines, 16,23,28 and aromatic dialdehydes. 23 Some reports employ tetrafunctional aromatic monomers, such as tetraamines, 24 or in the case of PIs the free tetracarboxylic acids instead of the corresponding dianhydrides.…”

“…24,31 To date, monomers used in HTP were mainly difunctional aromatic monomers, i.e., aromatic dianhydrides, 16,28,31 aromatic diamines, 16,23,28 and aromatic dialdehydes. 23 Some reports employ tetrafunctional aromatic monomers, such as tetraamines, 24 or in the case of PIs the free tetracarboxylic acids instead of the corresponding dianhydrides. 31 In these cases however, the 1,2-difunctionality is in fact required to generate the heterocyclic linkages and thus does not lead to networks but linear polyheterocyclics.…”

“…through the formation of a cyclic moiety connecting the monomeric units, accompanied by the release of a low-molecular weight by-product (H 2 O in the case of both minerals and of PIs). Aside PIs, HTP has recently been shown to be also amenable to the synthesis of polyamide networks, which in the reported example are, however, linked by linear amide functions (and hence no heterocyclic linkages), and based on both aromatic and also alicyclic moieties, 22 polyazomethines (also not featuring heterocyclic linkages but linear azomethine (aka secondary aldimine) linkages), 23 and polybenzimidazoles and benzoyl-imidazole polymers (aka BBB – benzimidazolebenzophenanthroline-type semiladder polymers). 24 HT cyclocondensations can also be used for generating small organic molecules, the technique is then rather termed hydrothermal synthesis (HTS), with examples comprising rylene bisimides, 25 benzimidazoles, 26 quinoxalines, 76 and the fused bisbenzoylimidazole perinone.…”

Microwave-assisted in situ laser dye incorporation into high sensitivity whispering gallery mode microresonators

“…Microwave (MW) assisted dispersion polymerisation is an attractive method because it significantly reduces the processing time, energy consumption and equipment size compared to conventional methods [37][38][39]. Higher rates of polymerisation, narrow polymer polydispersity, greater yields, or even completely new reactions, have been reported for MW synthetic approaches [37,[40][41][42][43][44][45][46]. MW-assisted polymerisation of styrene has been reported with 60 min reaction times in MW oven-type devices [42,43].…”