Electron microscopy on highly branched polystyrene starshaped polymers

Abstract

The technique of transmission electron microscopy (TEM) in combination with electron spectroscopic imaging and digitized image processing was used for determination of particle size and size distribution of a starshaped polystyrene sample. The results were compared with measurements of the translational diffusion coefficient D, from dynamic light-scattering method. The particle diameter d,, achieved by TEM-measurements is in good agreement with the effective hydrodynamic radius R , from the Stokes-Einstein relationship.

Scaling Algebras and Renormalization Group in Algebraic Quantum Field Theory.

“…For a tentative physical interpretation of these cases see [8]. Examples of nets with such remarkable short distance properties will be presented elsewhere [7].…”

Functionalizable branched poly(ethylene oxide)s grafted from poly(1,3-diisopropenylbenzene) backbones

“…One major drawback of this method is due to the fact that the functionality of the poly(DVB) cores cannot be really controlled in advance even under appropriate experimental conditions 4) . In addition, it is now well established that for polystyrene (PS) star-shaped polymers obtained from these living poly(DVB) cores, the distribution in functionalities is large 5) . The purpose of this article is to describe the synthesis and the characterization of a new type of functionalizable branched PEO using anionic polyfunctional initiators based on 1,3-diisopropenylbenzene (1,3-DIB).…”

Using the new in–in method for the synthesis of polyisoprene/polystyrene heteroarm star polymers

“…Until recently, there have been different methods for synthesizing star‐shaped polymers via anionic polymerization, including the deactivation method,7, 15–19 which is one aspect of the more general arm‐first method;8–10, 20, 21 the core‐first method;9, 22–24 the in–out method;21, 25–31 and the new in–in method, which we recently presented 32…”