Preparation, characterization and performance study of cellulose acetate membranes modified by aliphatic hyperbranched polyester

• Published in: Journal of membrane science Vol. 473; pp. 256 - 266
• Main Authors: Mahdavi, Hossein, Shahalizade, Taieb
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-01-2015
• Subjects: Aliphatic compounds; Asymmetric membrane; Blend; Cellulose acetate; Contact angle; Fluid dynamics; Flux; Hydraulics; Hydrophilicity; Hyperbranched polyester; Membranes; Phase inversion; Polyester resins; Hyperbranched polyester; Phase inversion; Cellulose acetate; Blend; Asymmetric membrane
• ISSN: 0376-7388; 1873-3123
• DOI: 10.1016/j.memsci.2014.09.013

Two generations of aliphatic hyperbranched polyester (HBPE) were synthesized from 2,2-bis(methylol)propionic acid and 1,1,1-trihydroxymethyl propane (TMP) as the core moiety by melt condensation method and were blended with cellulose acetate to prepare asymmetric membrane using a phase inversion process. Characterization of the prepared membranes for thermal behavior and morphological studies also has been made using TGA, DSC and SEM techniques. Water contact angle, pure water flux, water content, hydraulic resistance and molecular weight cut-off determinations were applied in order to study of filtration properties and surface and bulk hydrophilicity of the membranes. FTIR/ATR and contact angle results proved existence of (HBPE) on the surface of modified membranes and (FE-SEM) images have good correlation with flux and MWCOs. The result shows that, the surface hydrophilicity of membranes incorporating HBPE is much higher than pure CA or even (PEG-600) modified CA membranes. Furthermore, results show CA-HBPE membranes have lower flux and MWCOs, higher hydraulic resistance and better thermal and mechanical properties in comparison to the membranes modified by linear pore-forming agent.
•Blend membranes of CA and HBPEs with different compositions were prepared through a typical phase inversion method.•We emphasized on effect of additive structure and content on surface and bulk morphologies, filtration properties, wettability, thermal behavior and hydrophilicity.•Increasing of HBPE will cause controlled increase of pure water flux and MWCO of the CA membrane.•SEM images and porosity determination results demonstrated that the CA-HBPEs possess dense bulk structures compared with membranes modified with conventional additives.•Hyperbranched polyesters mostly improved surface properties of CA membranes and almost maintained bulk thermal and mechanical stability by forming inter-chain H-bond interactions.