Li-Ping Wang,Yu-Chao Li,Li-Feng Chen,Chao-Lei Ban,Guang Li,Jun-Jie Ni
Poly(styrene)- b -poly(N-isopropylacrylamide) (PS- b -PNIPAM) amphiphilic diblock copolymers were synthesized via reverse iodine transfer polymerization (RITP) firstly. And then the honeycomb structured porous films were fabricated by drop the amphiphilic diblock copolymer solutions on glass substrates . The porous films were characterized using field emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM), respectively. The results showed that the regular honeycomb patterned porous film was achieved successfully by employing the block copolymer with a significantly larger polystyrene block proportion into the solution and the pore diameter of the film decreases obviously with the polymer concentration increased. The effects of airflow speed and Ag particles on porous films are also discussed in this study.
Reversible-deactivation radical polymerization (RDRP) of chloroprene (2-chloro-1,3-butadiene, CP) using reverse iodine transfer polymerization (RITP) has been demonstrated for the first time. Reverse iodine transfer polymerizations of CP were studied in benzene at 50 °C using 2,2′-azobis(isoheptonitrile) (ABVN) as a radical initiator, where a molar ratio ABVN/I2 = 1.7 was used. The process efficiently controls the molar mass (characterized by size exclusion chromatography, SEC) and the structure of the polymer (confirmed by 1H NMR spectra). For example, polychloroprene (PCP) samples of Mn,SEC = 4900 g mol−1 and Mw/Mn = 1.73 (Mn,th = 4800 g mol−1), Mn,SEC = 7300 g mol−1 and Mw/Mn = 1.89 (Mn,th = 7300 g mol−1), and Mn,SEC = 9000 g mol−1 and Mw/Mn = 1.86 (Mn,th = 9300 g mol−1) were successfully obtained. Furthermore, the influence of solvent, initiator and temperature were studied. Last, the controlled nature of the polymer was confirmed by the preparation of polychloroprene-b-polystyrene (PCP-b-PSt) and polychloroprene-b-poly(methyl methacrylate) (PCP-b-PMMA) diblock copolymers.
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