Comparisons to experimental data show that (∂n/∂c) GD and (∂n/∂c) LL both yield average absolute deviations of approximately 0.009 ml/gm. This document supersedes 'Class II Special Controls Guidance Document: Polymethylmethacrylate (PMMA) Bone Cement 510(k)s Final Guidance for Industry' dated. SEC analysis of copolymers of different topologies with branched and linear copolyimides with PMMA blocks as a model system Kashina, A.V. Simplifying assumptions have been made to generalize these equations and make them more usable: 1) molar refractions are treated as constants, 2) the density of the polymer solution, in the limit of low polymer concentration, can be approximated via the additivity of volumes approach the densities of polymer-free solvents and solvent mixtures are not necessarily subject to this approximation, 3) the mass density of solvents and solvent mixtures can be estimated by any one of several models developed specifically for this purpose we will consider the Rackett equation, the COSTALD equation, and the standard assumption of mass and volume additivity, and 4) the mass density of a copolymer can be obtained from a weight fraction average of the mass densities of the homopolymers from which it is comprised. The resulting equations can be used to estimate ∂n/∂c as a function of polymer concentration, temperature, solvent composition, and, for copolymers, monomer composition. Additionally, in special cases an analysis of copolymer and structure composition can be performed.Equations for calculating the specific refractive index increment, ∂n/∂c, for polymer/solvent systems have been developed starting with either the Gladstone-Dale equation or the Lorentz-Lorenz equation for the refractive index of a dielectric medium.Molar mass weight average M W, average radius of gyration, M n, D.In addition, the values of Dn/c for PMMA against the The specic RII will be denoted here by dn/dc, in. Absolute molar mass determination by means of static light scattering 5 polymer in both acetone and DMF are determined.Universal calibration by means of viscometry.Average molar masses (M w, M n) polydispersity index D.(for details of this setup see Chapter 3), PLP-generated pMMA samples have. Conventional calibration with PS, PMMA, PEG, PEO, PLA and Pullulan As homopolymer of HEMA cannot be dissolved in THF, dn/dc values for ST.Special feature: column tempering, Fractions collector for semi preparative use.
Detection: Refractive Index-Detector, UV-Detector, Viscometer, Multi Angle Laser Light Scattering Detector(MALLS), Evaporative Light Scattering Detector (ELSD), Refractive Index/Viscosity-Dual-Detektor.Tetrahydrofurane (THF), Chloroform (TCM), Dichloromethane (DCM), Hexafluoroisopropanol (HFIP), Toluol, Dimethylformamide (DMF), Dimethylacetamide (DMAc), Dimethylsulfoxide (DMSO), if necessary with salt additive e.g.
0 kommentar(er)
