Micropatterned thin films have received increased interest in the past few years for use in chemistry and life sciences.Although they can be prepared either by conventional lithography1 or by soft lithography

but most of the methods require expensive and delicate equipment which limits their applications in some areas to a certain degree.A variety of polymers have been reported to be able to form ordered microporous films by water-assisted fabrication.But most of these polymers

include linear homopolymers

rod-coil or coil-coil block copolymers

star-like homopolymers or copolymers

et al. were synthesized under special design.Therefore

it is still desirable to develop simple techniques to prepare micropatterned polymer films.Chinese lacquer is a natural polymeric material and has been utilized as a coating material and adhesive since ancient times.Lacquer films have excellent anti-bacterial

waterproof

heatproof

anti-abrasive and anticorrosive properties.Nowadays

there is no literature about microporous lacquer films.In this paper

microporous films were fabricated from synthesized urushiol-formaldehyde diethylenetriamine polymer (UFDP) by “on-solid surface spreading" method and “on-water spreading" method.This is the first report of the two methods to produce micropatterned thin films from UFDP by water-assisted fabrication.Meanwhile

no blow airflow on polymer surface was used.The comparison of the two methods indicated that microporous films with monolayer can be fabricated by spreading on water but with multilayer by spreading on solid.Furthermore

several influencing factors on the formation of the microporous films and the different morphologies

such as the concentration of the polymer solution and the relative humidity in the atmosphere and the substrates

were investigated.The results showed that water surface as a spreading substrate was suitable to form orderly porous films for such a polymer.The monolayer film with a relative uniform pore size distribution could be formed from the polymer with concentration of 6.0 mg/mL at the relative humidity of 90% and room temperature using a water surface.