Journal ArticleDOI
Determination of polymer branching with gel‐permeation chromatography. I. Theory
E. E. Drott,R. A. Mendelson +1 more
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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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Molecular branching as a simple approach to improving polymer electrolyte membranes
Michael Adamski,Thomas J. G. Skalski,Eric M. Schibli,Miho Killer,Yang Wu,Nicolas Peressin,Barbara J. Frisken,Steven Holdcroft +7 more
TL;DR: A series of branched, sulfonated, phenylated poly(phenylene)s were synthesized by introduction of varying molar ratios of trifunctional monomer into the polymerization mixture as discussed by the authors.
Journal ArticleDOI
Randomly Branched Polymers. II. Computer Analysis of Gel-Permeation Chromatogram
TL;DR: In this article, an iterative computer method was proposed for estimating the degree of branching and molecular weight distribution simultaneously from a pair of measurements on intrinsic viscosity and gel-permeation chromatography.
Journal ArticleDOI
Thermal degradation of polyethylene in a nitrogen atmosphere of low oxygen content. IV. Structural changes occurring in different types of high-density polyethylene
Arne Holmström,Erling M. Sörvik +1 more
TL;DR: In this article, the thermal and thermo-oxidative degradation of reprecipitated and as received samples of different types of high-density polyethylene (HDPE) have been studied.
Journal ArticleDOI
Analysis of 13C FTn.m.r. spectra of low-density polyethylene by the simplex method
TL;DR: In this paper, high-field 13 C n.m.r. spectroscopy has been used on low-density polyethylene (LDPE) to determine the nature and concentration of branches.
Journal ArticleDOI
Reactor Modeling for Polymerization Processes
TL;DR: The engineering principles that apply to polymerization reactions are extensions of well-established principles for the study of reactions that involve small molecules as discussed by the authors, however, this additional degree of freedom comes at a cost, which introduces a level of complexity that requires careful consideration during reactor design, analysis, and/or operation.