- 作者: Yeun-Hsing Hwang and Mei-Hui Yang
- 中文摘要: 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 Ph2SiO 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 Ph2SiO mol%. The a 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.
- 英文摘要: --
- 中文關鍵字: --
- 英文關鍵字: --