Viscosity–molecular weight relationship for aminopropyl-terminated poly(dimethylsiloxane)

✍ Scribed by Yongzhong Wu; Shengyu Feng

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 111 KB
• Volume: 80
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1179

✦ Synopsis

Abstract

Aminopropyl‐terminated poly(dimethylsiloxane) (ATPS) with different molecular weights was prepared by base‐catalyzed equilibration of octamethylcyclotetrasiloxane and 1,3‐bis(3‐aminopropyl)‐1,1,3,3‐tetramethyldisiloxane with different ratios. Their number‐average molecular weights (M~n~) were determined by end–group analysis, and intrinsic viscosity ([η]) in toluene was measured with a Ubbelohde viscometer. A relationship between M~n~ and [η] was obtained for ATPS. For 1.0 × 10^4^ < M~n~ < 6.0 × 10^4^, it was in accord with [η]~toluene,25°C~ = 5.26 × 10^−2^ M~n~^0.587^. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 975–978, 2001