Synthesis of block copolymers having perfluoroalkyl and silicone-containing side chains using diazo macroinitiator and their surface properties

✍ Scribed by Dong-Kwon Kim; Soo-Bok Lee; Kap-Soo Doh; Young-Woo Nam

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 205 KB
• Volume: 74
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19991121)74:8<1917::aid-app5>3.0.co;2-g

✦ Synopsis

The fluorosilicone block copolymers of poly(perfluoroalkylethyl acrylate)-bpoly (3-[tris(trimethylsilyloxy)silyl] propyl methacrylates) (PFA-b-PSiMAs) having perfluoroalkyl and silicone-containing side chains were obtained by three-step synthetic approaches. In the first step, hydroxyl-terminated poly(perfluoroalkylethyl acrylate) macromonomer (PFAM) was prepared by the free-radical polymerization of perfluoroalkylethyl acrylate and 2-mercaptoethanol. In the second step, PFAM initiator (PFAMI) was prepared from the condensation reaction of the hydroxyl-terminated PFAM and 4,4Ј-azobis-4-cyanopentanoic acid chloride (ACPC). ACPC was obtained from the reaction of 4,4Ј-azobis-4-cyanopentanoic acid and phosphorus pentachloride. In the third step, PFA-b-PSiMAs (BPFSs) were synthesized from the reaction of PFAMI macroinimer and SiMA. Fourier transform infrared spectroscopy and 1 H-NMR analyses verified that the syntheses of ACPC, hydroxyl-terminated PFAM, PFAMI, and BPFS were completed successfully. The intrinsic surface energies of BPFSs and their surface modification effects on poly(vinyl chloride) film were investigated by analyzing the surface free energies and atomic compositions of the outermost layer of the surfaces. BPFSs exhibit extremely low surface free energies of about 9.7-13.0 dynes/cm. It was confirmed that BPFS, having extremely low surface free energy, is preferentially enriched at the outermost layer of the surface of BPFS/poly(vinyl chloride) blend.