Assessment of errors in the determination of Mark–Houwink–Sakurada and Stockmayer–Fixman constants using size-exclusion chromatography with on-line viscometric detection: Analyses of poly(p-substituted styrenes) in tetrahydrofuran
✍ Scribed by Michelle L. Coote; Thomas P. Davis
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 198 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0887-6266
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✦ Synopsis
In this work, we present values for the Mark-Houwink-Sakurada (MHS) and Stockmayer-Fixman (SF) constants for a series of homopolymers of para-substituted styrenes (4-X-styrene; X ϭ OCH 3 , OCH 2 CH 3 , CH 3 , F, Cl, and Br) in THF at room temperature. The respective values of K (in 10 Ϫ5 dL/g) and ␣ were: 0.685 and 13.2; 0.662 and 14.1; 0.740 and 8.41; 0.781 and 5.24; 0.726 and 8.95; 0.700 and 7.79. The respective values for K (in 10 Ϫ4 dL/g) and K' (in 10 Ϫ7 dL/g) were: 6.01 and 16.1; 6.22 and 9.07; 7. 64 and 17.4; 5.59 and 23.7; 6.29 and 17.3; 4.44 and 10.3. These constants were measured using size-exclusion chromatography with on-line viscometry. As part of this work, we investigate the applicability of common model fitting procedures to this method of measuring MHS/SF constants and the effect of uncertainties in their estimated values on the accuracy of molecular weight analysis.