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Effect of Silica Particle Size on Polymer Adsorption. Morphological, Energetic and Conformational Relationships
Author(s) -
Al Akoum Rami,
Haidar Bassel,
Vidal Alain
Publication year - 2005
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200550327
Subject(s) - adsorption , polymer , isothermal microcalorimetry , inverse gas chromatography , particle size , particle (ecology) , fumed silica , molecule , chemical engineering , materials science , surface energy , chemistry , organic chemistry , enthalpy , thermodynamics , physics , engineering , oceanography , geology
A series of six chemically treated and untreated fumed silicas with increasing particle size (ranging from the nano‐ to the micrometer size) was prepared. Surface areas (and morphologies) and surface energies were determined by nitrogen adsorption and inverse gas chromatography, respectively. The adsorption of a series of PDMS with different and well‐defined molecular weights was studied at different polymer concentrations. Amounts of adsorbed polymer were determined by gravimetry and the energies of adsorption were assessed by flow‐microcalorimetry. Results are discussed in terms of particle surface energy and morphology effects on the conformation and the inter‐connectivity of adsorbed polymer molecules.