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Diffuse‐In/Condense‐Out Behavior of Glycerol Induces Formation of Composite Membranes with Uniform Pores
Author(s) -
Wang ZhengHui,
Cheng Wei,
Liu CaiHong,
Ma Jun,
Zhang WenJuan,
Li Ji
Publication year - 2016
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201500224
Subject(s) - glycerol , materials science , membrane , layer (electronics) , chemical engineering , substrate (aquarium) , composite number , solvent , evaporation , porosity , polymer , cellulose , molecule , cellulose acetate , polymer chemistry , composite material , organic chemistry , chemistry , biochemistry , thermodynamics , geology , oceanography , physics , engineering
In this paper, an interesting glycerol behavior which can lead to the formation of composite polymer membranes with uniform pores in their surface layers is reported. Specifically, when cellulose acetate (CA) solution is spin‐cast on a porous substrate filled with glycerol, with the evaporation of the volatile solvent of CA, the nonvolatile glycerol in the substrate firstly diffuses up into the CA solution layer and then condenses out and arranges into uniform droplets on the coated layer. These glycerol droplets act as template for the precipitation of the CA molecules and thus result in the formation of the uniform pores in the CA layer.