Hydroxytelechelic polybutadiene, 13. Microstructure, hydroxyl functionality and mechanisms of the radical polymerization of butadiene by H2O2

✍ Scribed by Sylvie Poletto; Quang Tho Pham

• Book ID: 102483547
• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 426 KB
• Volume: 195
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1994.021951216

✦ Synopsis

Abstract

The mechanism of the radical polymerization of butadiene with H~2~O~2~ has been clarified by indepth examination of very low M̄~n~ hydroxytelechelic polybutadiene (HTPB) synthesized with high concentration of H~2~O~2~. For the well‐known R45M®‐HTPB^1,2^, only primary alcohol functions were found, and most of them originate from initiation steps (termination mechanisms only proceed by coupling of macroradicals); in low M̄~n~ HTPB (HTPB‐C), the presence of a secondary alcohol function suggests termination reactions by coupling between macroradicals and primary hydroxyl radicals. Being more branched, HTPB‐C has a larger hydroxyl content, and also a larger amount of epoxidized 1,4‐units. Finally, some lower alcohols, utilized for homogenizing H~2~O~2~ with butadiene, are also transfer agents giving rise to ether groups.