Cationic polyacrylamide induced nanoparticles assembly in a cellulose nanofiber network

摘要: Abstract Polyacrylamides of different molecular weight, charges and dosages allow to control the retention distribution nanoparticles (NPs) in composites, optimise composite properties functionality. Our aim is evaluate effect high weight (13 MDa) cationic polyacrylamide (CPAM) charge dosage on SiO2 (74 nm) NP’s assembly cellulose nanofibers composites. Engineered cellulose/SiO2 composites were investigated by SEM, SAXS DLS. SEM images show local area NPs into matrix. provides an average inter-NPs distance over complete volume composite. DLS gives hydrodynamic radius CPAM adsorbed onto a suspension. analysis reveals structure conformation made spherical core diameter 74 nm surrounded polyelectrolyte shell 2.5 nm thick. Surprisingly, induced with constant inter-nanoparticle distance, which irrelevant polymer density. However, fibre network increases dosage. The mechanism governed balance electrostatic steric forces following coverage bridging conformation. This maintains network.