Synthesis of macroazoinitiator by direct polycondensation for block copolymerization of styrene and butadiene

Abstract

Macroazoinitiator (MAI) was prepared from hydroxy-terminated polybutadiene (HTPB) and 4,4Ј-azobis-4-cyanopentanoic acid (ACPA) by direct polycondensation in the presence of 1-methyl-2-chloropyridinium iodide (MCPI) at room temperature. This MAI proved to be an effective initiator for thermal polymerization of styrene at 60°C. The resulting products were characterized by viscosity measurements and both IR and NMR spectral studies. The ratio of styrene and butadiene units was calculated from NMR spectral data and scanning electron micrography.

Synthesis and surface characterization of poly(methyl methacrylate)‐block‐polydimethylsiloxane copolymers from macroazoinitiator

“…As far as the method of using MAI to synthesize block copolymers is concerned, MAI needs to be prepared first. The conventional method for synthesis of MAI is complicated, moreover, the synthetic process needs the rigorous conditions, even now, a relatively low yield of MAI is obtained generally 9, 11, 12. For synthesizing MAI efficiently, in our experiment, the MAI was synthesized via a facile one‐step method under mild conditions, e.g., ambient temperature and moisture, and the yield of MAI could reach 80–90% 13.…”

One‐Step Method for Synthesis of PDMS‐Based Macroazoinitiators and Block Copolymers from the Initiators

“…The yields are about 53 and 59 wt.-% for ACPC and MAI, respectively. [13,18,24] Therefore, it remains a great challenge to chemists and materials scientists to develop facile and feasible methods to prepare PDMS-based MAIs for PDMS-based block copolymers.…”