Sorption behavior of biodegradable polyurethanes with carbohydrate crosslinkers

Abstract

Polyether-polyurethanes (PUs) with a series of carbohydrate crosslinkers: monosaccharide (glucose), disaccharide (fructose) and polysaccharide (starch), were synthesized. The kinetics of swelling was studied in industrially important solvents like toluene, xylene and chlorobenzene. The R value and diol / triol ratio were varied to study the effect on crosslink density and sorption. It was observed that the swelling extent increased with increasing concentration of crosslinker in the polymer. Interestingly the effect of diisocyanate concentration on extent of sorption varied with the type of carbohydrate used for crosslinking. Considering the effect of diisocyanate concentration, the PUs containing disaccharide sucrose showed greater solvent uptake. Though the sorption behaviours were different, the solubility parameters of all PUs were the same irrespective of the type and concentration of the crosslinkers. All the PUs were observed to be biodegradable with glucose containing PUs exhibiting highest weight loss. Scanning electron microscope revealed absence of phase segregation in all the PU systems.

Bio‐Based Polyurethanes from Carbohydrate Monomers

“…High temperatures and the incorporation of a liquid diol or polyol in the formulation, namely polyethylene glycol (PEG) [35][36][37], polyglycerol (PGL) [38], polypropylene glycol (PPG) [38,39], and polycaprolactone (PCL) [40] are required when the polymerization is performed in bulk.…”

“…The material cross-linked with xylose 55 [34] displayed high adhesiveness and biocompatibility properties, making it suitable for being used in the medical field. Depending on the final use of the cross-linked material, the reaction can be conducted in bulk [33,38,40,50].…”

Immobilization of metal nanoparticles on polyurethane membranes: synthesis and electrical properties

“…As per our earlier observations the solubility parameter of the starch crosslinked PUs matched with that of acetic acid. 6 Hence when the Ag nanoparticle immobilized PU membrane (PU-Ag) was immersed in acetic acid extensive swelling of the membrane took place. As equilibrium approached the membrane disintegrated.…”

“…The swelling and electrical properties of PUs containing starch as crosslinker have been previously investigated in our laboratory. 6,7 With a view to enhancing the conducting properties we attempted the incorporation of metal nanoparticles into crosslinked PU membranes by a novel sorption method in a manner similar to hydrogels. 8 The sorption ability of PU could be very well exploited to facilitate transport of metal ions into the membranes.…”

Biopolymers as effective fillers in natural rubber: Composites versus biocomposites

“…A major drawback of these biopolymers is that they are hydrophilic in nature and, therefore, have an affinity toward moisture; this leads to low degrees of adhesion between the fiber and matrix 26. A reduction in water uptake was observed, and it was attributed to better compatibilization between the fiber and the matrix.…”