SET‐LRP synthesis of PMHDO‐g‐PNIPAM well‐defined amphiphilic graft copolymer

Abstract

A well-defined amphiphilic graft copolymer, consisting of hydrophobic polyallene-based backbone and hydrophilic poly(N-isopropylacrylamide) (PNIPAM) side chains, was prepared by the combination of living coordination polymerization, single electron transfer-living radical polymerization (SET-LRP), and the grafting-from strategy. First, the double-bond-containing backbone was prepared by [(g 3 -allyl)NiOCOCF 3 ] 2 -initiated living coordination polymerization of 6-methyl-1,2-heptadiene-4-ol (MHDO). Next, the pendant hydroxyls in every repeating unit of poly(6-methyl-1,2-heptadiene-4-ol) (PMHDO) homopolymer were treated with 2-chloropropionyl chloride to give PMHDO-Cl macroinitiator. Finally, PNIPAM side chains were grown from PMHDO backbone via SET-LRP of N-isopropylacrylamide initi-ated by PMHDO-Cl macroinitiator in N,N-dimethylformamide/2propanol using copper(I) chloride/tris(2-(dimethylamino)ethyl)amine as catalytic system to afford PMHDO-g-PNIPAM graft copolymers with a narrow molecular weight distribution (M w /M n ¼ 1.19). The critical micelle concentration (cmc) in water was determined by fluorescence probe technique and the effects of pH and salinity on the cmc of PMHDO-g-PNIPAM were also investigated. The micellar morphology was found to be spheres using transmission electron microscopy.

Thermal processing influence on mechanical, thermal, and biodegradation behavior in poly(β‐hydroxybutyrate)/poly(ε‐caprolactone) blends: A descriptive model

“…[10][11][12][13] PCL has been blended with PHAs using the casting method. [13][14][15][16] The presence of two polymeric phases comes as a result from immiscibility of PHB and PCL in their blends. 6 Kumagai and Doi 7 reported the separation of macrophases in PHB and PCL blends thus affecting mechanical properties of blends.…”

Aqueous SET-LRP catalyzed with “in situ” generated Cu(0) demonstrates surface mediated activation and bimolecular termination

“…3 Subsequently, SET-LRP was expanded to acrylates, [4][5][6][7][8][9][10][11][12][13][14][15][16][17] methacrylates, 8,[18][19][20][21][22][23][24][25] acrylamides, [26][27][28][29][30][31] methacrylamide, 32 acrylonitrile, 33,34 and monomers containing more complex water soluble side groups, such as sugars, 35,36 N-(2-hydroxypropyl) methacrylamide, 32 dimethylacrylamide, 26 N-isopropylacrylamide, 26,[37][38][39] oligo(ethylene oxide) methyl ether acrylate, 40 oligo(ethylene oxide) methyl ether methacrylate, 41 hydroxyethyl acrylate, 10 hydroxyethyl methacrylate 23 and acryloyl morpholine. 42 At the same time as these developments, the list of solvents used in SET-LRP was expanded to other solvents that in combination with aliphatic N-donor ligands, such as tris[(2-dimethylaminoethyl)...…”

Marrying mussel inspired chemistry with SET‐LRP: A novel strategy for surface functionalization of carbon nanotubes

“…Conversely, SET‐LRP is a relative novel polymerization method for synthesis of different polymers. As compared with ATRP, SET‐LRP can obtain polymer brush in the present air and water with faster reaction ratio . Therefore, the method described in our work should be more simple and effective for surface modification of nanomaterials with polymer brush.…”

“…As compared with ATRP, SET-LRP can obtain polymer brush in the present air and water with faster reaction ratio. [68][69][70][71][72][73][74][75][76] Therefore, the method described in our work should be more simple and effective for surface modification of nanomaterials with polymer brush.…”