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Determination of Molecular Weight of PDPS Modified Copolymers
Author(s) -
Hwang YeunHsing,
Yang MeiHui
Publication year - 2000
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200000021
Subject(s) - copolymer , chemistry , gel permeation chromatography , polymer chemistry , tetrahydrofuran , viscometer , siloxane , polymer , molar mass distribution , polydimethylsiloxane , materials science , viscosity , organic chemistry , composite material , solvent
Molecular weight (MW) determinations of polydiphenylsiloxane‐ co ‐polydimethylsiloxane (PDPS/PDMS), polydiphenylsiloxane‐ co ‐polymethylphenylsiloxane (PDPS/PMPS) and polydiphenylsiloxane‐ co ‐polymethyl(3,3,3‐trifluoropropyl)siloxane (PDPS/PMFPS) statistical copolymers by gel permeation chromatography (GPC), GPC coupled differential viscometer (GPC‐DV) and light scattering (LS) techniques have been compared and discussed. The MW obtained by GPC‐DV in the PDPS/PDMS and the PDPS/PMPS series agreed with that obtained by LS very well. In PDPS/PDMS copolymers, it was found that the MW obtained by GPC was much lower than that obtained by GPC‐DV and LS, as Ph 2 SiO) content is higher than 50 mol%. In PDPS/PMFPS copolymers, the MW obtained by GPC was far different from that obtained by GPC‐DV and the deviation decreased with increasing Ph 2 SiO) mol%. The α values of the copolymers can be explained by the structure of the polymer in tetrahydrofuran (THF). Based on the relatively soluble copolymers, not only the differential refractive index increments ( dn/dc ) of PMPS, PDMS and PMFPS homopolymers but also that of the PDPS homopolymer in THF could be calculated by their corresponding copolymers.