SEC/MALLs

Molecular weights for fully hydrolyzed and partially hydrolyzed grades of PVA (expressed in terms of 4% solution viscosity) from aqueous SEC-MALLS are summarized in Table 20.6. M values range from less than 20,000 Da for a 3 centipoise (cP) viscosity grade to over 230,000 Da for a super-high viscosity... 

TABLE 20.6 Molecular Weight of PVA from Aqueous SEC-MALLS Using TSK-PW Columns... 

TABLE 20.10 SEC-MALLS Data for Cationic Poly(2-vinyl pyridine) Standards Using MALLS and CATSEC Columns°... 

Size exclusion chromatography coupled to static light scattering (SEC-MALLs) Molecular weight, molecular weight distribution. Polydispersity. Radius of gyration and distribution solution conformation and flexibility. Method of choice for moleciflar weight work. [4]... 

The approach is to first of all obtain mucin to a high degree of purity and to characterise the mucin and potential mucoadhesive. This is done by sedimentation velocity [g (s)j analysis and sedimentation equilibrium (M ) analysis—according to the procedures described above—together with SEC-MALLs [145,146]. 

Puskas, J.E. et al. Comparison of molecular weight and size measurement of polyisobutylenes by SEC-MALLS and viscometry, J. Polym. Sci. Chem., 44, 1777, 2006. 

Keywords. Solution properties. Regularly branched structures. Randomly and hyperbranched polymers. Shrinking factors. Fractal dimensions. Osmotic modulus of semi-di-lute solutions. Molar mass distributions, SEC/MALLS/VISC chromatography... 

Turbidity, light seattering SEC MALLS particularly useful for determining MW of mucin, turbidity, semi-quantitative indicator... 

Relative proportion of MMA and TEMPO containing monomers in Scheme 8.10. Determined by SEC-MALLS. 

A general assembly for a SEC-MALLS instrument is given in Figure 3.16. A typical three-dimensional plot obtained from such an assembly is shown in Figure 3.17. 

FIGURE 3.16 Typical SEC-MALLS setup including refractive index refractometer. (Courtesy of Wyatt Technology Corporation, Santa Barbara, CA 93117 wyatt wyatt.com. With permission.)... 

SEC-MALLS and SEC-LALLS Coupled chromatography and light-scattering photometry that allows the determination of a number of important values along with chain length distribution, sedimentation equilibrium experiment Ultracentrifugation technique that allows chain length information to be determined. 

Heins, D., Kulicke, W. -M., Kauper, P, Thielking, H. (1998). Characterization of acetyl starch by means ofNMR spectroscopy and SEC/MALLS in composition with hydroxyethyl starch. Starch, 50,431 37. 

Multi angle laser light scattering (SEC/MALLS), 16 Multiple-component polymer systems, 36,38 Multiplet structure, 368... 

SEC-MALLS Molar mass distribution Radius of gyration distribution... 

Figure 6. Differential and cumulative molecular weight distributions for pullulan 380 kD obtained by SEC-MALLS.

Intrinsic viscosity [q] can be related to complex size via MFIKS, a coefficient Diffusion coefficient, D, can be related to complex size via MFIKS c. coefficient SEC malls particularly useful for determining MW of mucin, turbidity, semiquantitative indicator... 

Changes of the molecular mass of HA could also be monitored by a number of further methods. For instance, size exclusion chromatography/multi-angle laser light scattering (SEC-MALLS) [244] and high performance liquid chromatography (HPLC) [215] were also used to study the radical-induced depolymerization of HA. 

Tackx and Tacx 1-1.5 1.2-1.8 Autoclave reactor tubular reactor TCB at 140°C SEC-MALLS to calculate g and KMHS equation with universal calibration to get / [36]... 

Tackx, P. Tacx, J.C.J.F. Chain architecture of LDPE as a function of molar mass using size exclusion chromatography and multi-angle laser light scattering (SEC-MALLS). Polymer 1998, 39 (14), 3109-3113. 

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