Synthesis and characterization of novel functional hyperbranched polyamides from AB₂ units: effect of extra functional groups

Abstract

Hyperbranched polymers (HPs), which in terms of structure may be compared to the branching structure of trees, are referred to as tree-like materials, but role of leave in these tree-like polymers is neglected and much attention has only been paid to their branches. In fact, functional groups in these polymers play a vital role the same as the role of leaves in trees. Therefore, in this paper, an attempt has been made to design and synthesize three AB 2 monomers containing extra hydroxyl and nitro groups. The benefits of their presence in the structure of produced hyperbranched polyamides (HPs) are investigated. The polymer structure was characterized by FT-IR and 1 H NMR. The solubility of synthesized HPs was studied in different protic and aprotic solvents. The thermal stability of the prepared HPs was investigated by thermogravimetric and differential scanning calorimetric analyses. The photoluminescent properties of the HPs were also investigated.

A covalent organic framework for chiral capillary electrochromatography using a cyclodextrin mobile phase additive

“…24 And several strategies have been reported to provide the chiral selectivity in CEC mode, such as synthesizing chiral solid phase, depositing chiral selector, using the chiral mobile phase additive. 25,26 An important advantage of adding the chiral additive to the running buffer is the flexibility, because there are a variety of chiral selectors, such as cyclodextrins, cyclodextrins derivatives, macrolides and some chiral small molecules, and convenient to combine with the high efficient solid phase resulting in synergistic benefits. 27 For searching relevant publications in the last 6 years (2016-2021) using SCI Finder, 160 results were discovered for "cyclodextrins and chiral separation."…”