Preparation of Well‐Defined Poly(2‐hydroxyethyl methacrylate) Macromonomers via Atom Transfer Radical Polymerization

Abstract

A series of six near-monodisperse methacrylic macromonomers is prepared via atom transfer radical polymerization (ATRP) of 2-hydroxyethyl methacrylate using a tertiary amine-functionalized initiator at 50 °C, followed by quaternization with excess 4-vinylbenzyl chloride at 20 °C. GPC analyses indicate polydispersities of around 1.20 and their mean degrees of polymerization (DP) range from 20 to 70, as judged by both (1) H NMR and UV spectroscopy. The former technique is more convenient but the latter proved more accurate for the higher DP values, provided that an appropriate model compound is utilized for calibration. Finally, these new macromonomers are used to prepare sterically stabilized polystyrene latexes with relatively narrow size distributions via alcoholic dispersion polymerization.

Functional Supramolecular Polypeptides Involving π–π Stacking and Strong Hydrogen-Bonding Interactions: A Conformation Study toward Carbon Nanotubes (CNTs) Dispersion

“…After postfunctionalization, the interval between adjacent signals of PPLG 10 DAP was 527 Da, with the peak maxima of the spectra having shifted to higher molecular weight as a result of the change in the repeat unit’s structure. The molecular weights calculated from the MALDI-TOF mass spectra were accord with those from the 1 H NMR spectra, but lower than those measured using GPC because of different hydrodynamic radii in the DMF used as the eluent and the systematic deviation in the structures of the polypeptides and the standard PS used to obtain the GPC calibration curve. , …”

ATRP Synthesis of Sunflower Polymers Using Cyclic Multimacroinitiators

“…The ATRP conditions for the synthesis of P­(HEMA- st -EGMA) copolymer were adapted from reported procedures with some modifications considering that ATRP of acrylamide-type monomers remains challenging, and more active ligands, such as 1,1,4,7,10,10-hexamethyltriethyllenetetramine (HMTETA), N , N , N ′, N ′′, N ′′-pentamethyldiethylenetriamine (PMDETA), and tris­[2-(dimethylamino)­ethyl]­amine (Me 6 TREN), can offer improved control over the polymerization. Linear P­(HEMA- st -EGMA) was first synthesized using the CuBr/PMDETA catalyst in isopropanol/ N , N ′-dimethylformamide (IPA/DMF) (9/1, w/w) at 65 °C for 16 h. The benefits of this current polymerization condition are confirmed by a kinetics study (Figure S1).…”

Facile Preparation of Monodisperse Poly(2‐hydroxyethyl acrylate)‐Grafted Poly(methyl methacrylate) Microspheres via Photoinitiated RAFT Dispersion Polymerization

“…This is a more straightforward and efficient approach to prepare polymer‐grafted polymeric microspheres with relatively low density of grafted polymers. A large number of functional polymers (e.g., block copolymer and macromonomer) have been explored to synthesize polymer‐grafted polymeric microspheres by emulsion polymerization, precipitation polymerization, and dispersion polymerization . Despite the tremendous progress made in this research area, many challenges still remain to be addressed.…”