Grafting of functional methacrylate polymer brushes by photoinduced SET-LRP

Abstract

The growth of polymer brushes from a variety of methacrylate monomers was accomplished using UV light as a polymerization trigger.

An Ionophore‐Based Anion‐Selective Optode Printed on Cellulose Paper

“…In filter paper,c ellulose chains organize into microfibrils that consist of crystalline and non-crystalline domains,a nd microfibrils further pack into fibers. [11] Ink for optode fabrication could access and modify the surface of fibers with ease.H owever,c rystalline domains are impenetrable toward water and most solvents,i ncluding cyclohexanone,b ecause of substantial inter-a nd intra-molecular hydrogen bonding.Therefore,the crystalline bulk of cellulose fibers is difficult to dope with the sensing ingredients.I n contrast, penetration of ink into the fiber bulk could take place through loosely-ordered non-crystalline domains.T he thin layer surface modification and limited bulk modification through non-crystalline defects is further supported by the following observations:1 )XPS depth profiling analysis (see inset of Figure 2) shows that al arge portion of sensing ingredients were eliminated by only 20 sofion beam etching (corresponding to an etching thickness of afew nm or less [12] ) but the amount of sensing ingredients levels off for the subsequent etching cycles (resulting from in-depth modification);2 )inm icroscopic pictures (Supporting Information, Figure S1), large fibers show an accumulated reddish color on the surface,b ut only limited reddish domains are observed from the fiber bulk.…”

Continuous Flow Photoinduced Reversible Deactivation Radical Polymerization

“…[73][74] Various systems consisting of different photo-initiator, ligands and solvents have been developed and applied. [39][40][63][64][65][66][67][75][76][77][78][79][80] Junkers and coworkers [81] 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 narrow polydispersities (< 1.2) could be achieved in 20 min in this system, whereas 90 min was required to reach full monomer conversion in the batch reactor. Water-ethanol mixture was used as the green alternative to the common solvent DMSO without any loss in polymerization control.…”

Surface-grafted polyacrylonitrile brushes with aggregation-induced emission properties

“…[44][45][46][47] Furthermore, photoinduced RDRP techniques have recently gained widespread interest for the preparation of polymer brushes due to their simplicity, straightforward patterning, temporal control and partial oxygen tolerance. 6,[48][49][50][51][52][53] Since PAN was not synthesized by photoinduced ATRP before, we first developed conditions for the controlled photopolymerization of AN in solution (Scheme 1). The reaction was initiated by α-bromophenyl acetic acid (BPAA) in the presence of 50-290 ppm (vs. monomer) of CuBr 2 /tris(2-pyridylmethyl)amine (TPMA, in 1 : 3 ratio) catalyst under UV irradiation (λ = 365 nm) in DMSO.…”