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Viscosity/molecular‐weight relationship for γ‐(2,3‐dihydroxypropoxy)propyl‐terminated poly(dimethylsiloxane)s
Author(s) -
Feng Shengyu,
Zhang Jie,
Wang Dake,
Wu Mingyan,
Yu Zhaotan
Publication year - 2004
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.21106
Subject(s) - toluene , octamethylcyclotetrasiloxane , intrinsic viscosity , ubbelohde viscometer , polymer chemistry , viscometer , copolymer , viscosity , materials science , chemistry , polymer , organic chemistry , composite material
A series of γ‐(2,3‐dihydroxypropoxy)propyl‐terminated poly(dimethylsiloxane) (DHT‐PDMS) samples with different molecular weights were prepared through the acid‐catalyzed equilibrium copolymerization of octamethylcyclotetrasiloxane and 1,3‐bis[γ‐(2,3‐dihydroxypropoxy)propyl]tetramethyldisiloxane. The intrinsic viscosity in toluene ([η] toluene ) and the number‐average molecular weight ( M n ) were determined with an Ubbelohde viscometer and 1 H‐NMR spectra, respectively. In this way, the relationship between [η] toluene and M n was established. For 2.0 × 10 4 < M n < 4.0 × 10 4 , [η] toluene,25°C was 1.874 M n 0.323 . The solution behavior of DHT‐PDMS was also investigated. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 1759–1762, 2004
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