Polystyrene‐b‐poly(2,2,2‐trifluoroethyl acrylate)‐b‐polystyrene copolymers: Synthesis and fabrication of their hydrophobic porous films, spheres, and fibers

Abstract

New block copolymers Polystyrene-b-poly (2,2,2trifluoroethyl acrylate)-b-Polystyrene (PS-PTFEA-PS) with controlled molecular weight (M n 55000-11000 gÁmol 21 ) and narrow molecular weight distribution (M w /M n 51.13-1.17) were synthesized via RAFT polymerization. The molecular structure and component of PS-PTFEA-PS block copolymers were characterized through 1 H NMR, 19 F NMR, GPC, FT-IR and elemental analysis. The porous films of such copolymers with average pore size of 0.80-1.34 lm and good regularity were fabricated via a static breath-figure (BF) process. The effects of solvent, temperature, and polymer concentration on the surface morphology of such film were investigated. In addition, microstructured spheres and fibers of such block copolymers were fabricated by electrospinning process and observed by scanning electron microscopy (SEM). Furthermore, the hydrophobicity of porous films, spheres, and fibers was investigated. The porous film showed a good hydrophobicity with the water-droplet contact angles of 1298, and the fibers showed higher hydrophobicity with the waterdroplet contact angles of 1428. V C 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016, 54, 678-685

Effect of polar groups of polystyrenes on the self‐assembly of breath figure arrays

“…Up to now, a lot of polymers with different topological structures have been investigated in the BF process, including star‐shaped polymers, 18,32,33 dendrimers, 34 comb‐like polymers, 35 rod–coil block copolymers, 36,37 and linear polymers 38–43 . Apart from topology, the chemical composition of polymers also shows great impact on their self‐assembly behavior.…”

“…[18][19][20][21][22][23][24][25][26][27][28][29][30][31] Up to now, a lot of polymers with different topological structures have been investigated in the BF process, including star-shaped polymers, 18,32,33 dendrimers, 34 comb-like polymers, 35 rod-coil block copolymers, 36,37 and linear polymers. [38][39][40][41][42][43] Apart from topology, the chemical composition of polymers also shows great impact on their self-assembly behavior. Ji et al reported that the Di Zhou and Bai-Heng Wu contributed equally to this work.…”

Deterministic Reshaping of Breath Figure Arrays by Directional Photomanipulation

“…The morphology of BFAs relies on the nucleation and growth of water droplets, which are susceptible to experimental parameters, such as relative humidity, concentration, polymer type, and polymer composition. With an optimized static BF process, the uncertainties have been further minimized to tolerate various casting conditions and facilitate the formation of ordered BFAs on a large scale. − …”

Low Tg, strongly segregated, ABA triblock copolymers: a rheological and structural study

“…[12][13][14][15][16] For example, polystyrene-b-poly(trifluoroethyl acrylate)-b-polystyrene copolymers were synthesized via RAFT polymerization to prepare ordered hydrophobic porous films via static breathing patterns. 17 Poly(acrylic acid)-b-poly(heptafluorobutyl acrylate)-b-poly(acrylic acid) triblock copolymers, made by RAFT emulsion polymerization, were used to obtain transparent films with excellent mechanical and optical properties. 18 Poly(tert-butylacrylate)-b-poly(trifluoroethyl acrylate)-b-poly(tert-butylacrylate) copolymers were synthesized by RAFT and used to prepare micelles of different sizes and morphologies in THF/water mixtures.…”