Determination of the structural parameters of aqueous polymer solutions in the molecular, partially aggregated, and particulate states by means of FFFF/MALLS
✍ Scribed by Heiko Thielking; Werner-Michael Kulicke
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 156 KB
- Volume
- 10
- Category
- Article
- ISSN
- 1040-7685
No coin nor oath required. For personal study only.
✦ Synopsis
Flow field-flow fractionation FFFF has a separation range from f 10 to 10 12 g mol y1 in terms of molar mass and only requires that the sample be Ž . soluble or dispersable in some carrier liquid. By coupling this technique with a Ž . multiangle laser light-scattering photometer MALLS , it becomes possible to obtain the absolute distributions of the molar mass and radii of gyration in addition to the distribution of the hydrodynamic radii. The required information on the polymer shape and solution structure can then be derived from these data. The coupling of FFFFrMALLS has proven to be a powerful method for characterizing aqueous systems; one of the reasons for this was the introduction of a circulating cross flow. The scope for applying this new analytical technique is illustrated by Ž . means of homogeneously dissolved polymer molecules dextran , cationic polyelec-Ž . Ž trolytes poly-diallyldimethylammonium chloride , particulate systems latices, al-. bumin, and tobacco mosaic virus , and solutions containing partially aggregated Ž .
4 molecules pectin solutions within a molar mass range from M s 8 = 10 g W mol y1 to M s 2 = 10 7 g mol y1 .