Abstract:Water-soluble cellulose ethers (CEs) can form hydrogen-bonded polymer complex with poly(acrylic acid) (PAA). In this work, hydroxyethyl cellulose (HEC) and PAA were selected as acceptor and donor to prepare H-bonded film. Then, HEC/PAA film was post treated with other H-bonding donor, such as tannic acid, and other acceptors, such as hydroxypropyl cellulose (HPC), methyl cellulose (MC) and poly(vinylpyrrolidone) (PVPON). The film composition and thickness changes were concerned. The film thicknesses increase after Post-Assembly Treatment in MC, PVPON and TA solution, and the third component successfully getting into films can also be clearly observed on FT-IR spectra. And when the film prepared with FITC labeled HEC and PAA was immersed into the solution of RB labeled HPC, we found that HPC diffused into the film while HEC diffuses out from the film. These experiments results indicate that the post-treatment of the film with other H-bonding donor or acceptor polymer is a dynamics process, during which polymer chains diffusing into and diffused out from the film. The post treatment will increase the film thickness and change the composition of films, which providing an approach to further modify the Layer -by-Layer assembled film.