MALLS scattering

Concentration (DRI) and MALLS (scattering angle = 90°) chromatograms for a superhigh-molecular-weight P VA. 

FIGURE 6.4 Comparison of Shodex GPC UT column and conventional-type column. Column Left Shodex GPC UT-806M X 2, 8 mm i.d. X 300 mm X 2. Right Conventional type column X 2, 7.8 mm i.d. X 300 mm x 2. Eluent 0.1% BHT in ODCB. Flow rate 1.0 mL/min. Detector Rl, MALLS (multi-angle laser light scattering detector). Column temp. I45°C. Sample High-density polyethylene. 

Static (multi-angle laser) light scattering (SLS or MALLs) Molecular weight, radius of gyration, Rg solution conformation and flexibility. Solutions need to be clear of supramolecular aggregates. Rg more sensitive to conformation than s. [3]... 

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]... 

MALLS multi angle laser light scattering... 

The structures of the substituents with one, two and three layers, (denoted as Gl, G2 and G3, respectively), as well as the MIM structures, were confirmed using ESI-MS. The molecular weights of the MIMs were also determined using laser light scattering (MALLS detector coupled with SEC). 

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. 

Recently, Kulicke et al. [145] applied the principle of Flow-Field-Flow-Frac-tionation (F4) in combination with multi angle laser light scattering (MALLS) to characterize PDADMAC. Differential and integral molar mass distributions have been published for PDADMAC. One advantage of this method seems to be that it can be extended to the investigation of the mass distribution of aggregated and particulate components. 

Fig. 3 GPC setup for functional group profiling. RI refractive index detector Fluorescence fluorescence detector MALLS multi-angle laser light scattering detector...

Muller et al. [53] prepared similar PMMA-g-PMMA by radical copolymerization of MMA with methacrylate-terminated PMMA macromonomer, 29, and characterized the samples by SEC-multiangle laser fight scattering (MALLS). The power law exponent, a, in the equation, 1/2°cMa, was found to be 0.36. In remarkable contrast to the result of Ward et al. [51], the shrinking factor decreased with increase of MW. This may imply that the difference in graft copolymerization method, anionic or radical, results in the graft copolymers with very different branch distribution. 

MALLS multiple angle laser fight scattering... 

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

In recent years, multiangle laser light scattering (MALLS) detectors have become highly popular in SEC and also in FFF (see,e.g. [135-140]), since they also determine molar masses and molecular dimensions on an absolute basis. Here, the scattered light is simultaneously detected at various angles so that an extrapolation to zero angle is possible. Such instruments are commercially available from several companies. As an important development, the FFF-MALLS combination is discussed in a separate chapter (see Sect. 4.1.2). 

GPC/SEC-HPLC, gel electrophoresis, multiangle laser hght scattering (MALLS), laser diffraction Biological activity (direct or indirect)... 

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