Showing papers by "Gérard Riess published in 2006"
TL;DR: In this article, the influence of the irradiation time, the photoinitiator (4-benzoylbenzyl)trimethylammonium chloride, and the concentration of the polymer solution on the efficiency of the cross-linking process in moderately frozen systems was investigated.
41 citations
TL;DR: In this article, a colloidal dispersions of vinyl alcohol-vinyl acetate copolymers (PVAs) with different degrees of hydrolysis (DH) were prepared by a coacervation technique.
Abstract: Well-defined colloidal dispersions of vinyl alcohol–vinyl acetate copolymers (PVAs) with different degrees of hydrolysis (DH) were prepared by a coacervation technique. Colloidal particles in the size range 150–250 nm, with an acetate-rich core and a hydrophilic PVA corona, were obtained using a combination of a hydrophobic PVA (PVA II) having an average DH () value of 43 mol% with a ‘blocky’ hydrophilic PVA (PVA I) with a value of 72 mol%. The core–shell structure of these particles was demonstrated using 1H NMR and using fluorescence-labelled PVA I. The stabilization efficiency of PVA I and PVA II and their combination was examined for 1-chlorobutane–water emulsions, as a ‘model solvent’ for vinyl chloride–water emulsions. Preliminary tests of vinyl chloride suspension polymerization confirmed the beneficial effect of PVA I and PVA II combinations as stabilizers on the granulometry and the porosity specifications of the poly(vinyl chloride) grains. Copyright © 2006 Society of Chemical Industry
16 citations
Patent•
01 Aug 2006
TL;DR: In this article, a homogeneous powder comprising or consisting of: 0.01 - 20% of one or several amphiphilic substances with solubility Parameters δd comprised between 15.0 and 13.0 J1/2/cm3/2, 80 - 99.99% (w/w) of a combination of lipids consisting of, i.e., 65 - 95% of palmitoyl-oleoylphosphatidylcholine (POPC), ii.e. 5 - 35% of dioleoyl
Abstract: The invention relates to a homogenous powder comprising or consisting of: 0.01 - 20% (w/w) of one or several amphiphilic substances with solubility Parameters δd comprised between 15.0 and 23.0 J1/2/cm3/2 and (δp2 + δh2)1/2 comprised between 6.0 and 13.0 J1/2/cm3/2, 80 - 99.99% (w/w) of a combination of lipids consisting of: i. 65 - 95% (w/w) of palmitoyl-oleoyl-phosphatidylcholine (POPC), ii. 5 - 35% (w/w) of dioleoyl-phosphatidylserine (DOPS), iii. 0 - 20% (w/w) of other phospholipids, 0 - 10% (w/w) of cholesterol, and further characterized by: having a specific volume of 4 - 40 ml/g of blended lipids, showing in the differential scanning calorimetry (DSC) tracing a Single endothermic transition with a monomodal peak with a maximum at 30 - 50°C and a transition enthalpy of 10 to 30 J/g.
3 citations