Journal ArticleDOI
Determination of polymer branching with gel‐permeation chromatography. I. Theory
E. E. Drott,R. A. Mendelson +1 more
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TLDR
In this paper, the effect of long and short-chain branching in polymer molecules on gel-permeation chromatographic (GPC) separation is discussed, and the calculation of calibration curves for branched polymers is developed from the universal calibration technique based on the hydrodynamic volume concept.Abstract:
The effect of long-and short-chain branching in polymer molecules on gel-permeation chromatographic (GPC) separation is discussed. The calculation of calibration curves for branched polymers is developed from the universal calibration technique based on the hydrodynamic volume concept and previously established relationships for the effect of branching on molecular dimensions. Typical calibration curves are shown for different branching models and degrees of branching. As branching increases, the curves are shown to converge. Methods of characterizing branching and molecular weight distributions of franctions and whole polymers from GPC and intrinsic viscosity data are presented.read more
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Journal ArticleDOI
Quantification of branching in disordered materials
TL;DR: In this article, small-angle scattering of X-rays and neutrons is used to quantify the branch content through application of concepts native to fractal geometry, which can be used to quantitatively quantify the branching content of polymers.
Journal ArticleDOI
Étude des Lignines d’Extraction par G.P.C., Viscosimétrie et Ultracentrifugation: Détermination du Degré de Ramification
TL;DR: In this paper, the parametres structuraux d'une lignine, extraite de l'epicea par solvolyse dans le dioxanne en presence d'HCl and fractionnee par GPC are determined.
Journal ArticleDOI
Characterization of low-density polyethylene by gel permeation chromatography—II. Study on the Drott method using fractions
G.R. Williamson,A. Cervenka +1 more
TL;DR: In this paper, the relationship between thermodynamical quality of the solvent and depression in the intrinsic viscosity due to branching was investigated in low-density polyethylene and polyethylenes of different structures.
Journal ArticleDOI
Thermal degradation studies of different polar polyethylene copolymers
TL;DR: The thermal degradation of different polar polyethylene copolymers, such as EBA, EEA, and EHEMA, was studied by using thermogravimetric analysis (TGA), infrared analysis (FTIR), and size exclusion chromatography (SEC).
Book ChapterDOI
Practical Aspects of Molecular Weight Measurements
TL;DR: This chapter reviews the essentials of practical techniques for measuring average molecular weights and characterizing molecular weight distributions based on end-group analysis and on vapor phase osmometry, which are described in this chapter.