Using poly (4-merhylpentene-l) (PMP) as a membrane material and cyclohexane

irich-loroethylene

tetrachloroethylene

mixture of cyclohexane and trichloroethylene or tetrachloro-ethylene as solvents

the solution were cast to form homogeneous dense membranes

and the crystalline properties and surface morphology were investigated by DSC and TEM. The results

showed that the crystalline form

crystallinity

and surface morphology of PMP membrane are closely related to the solubility and evaporation rate of solvents. A new type of PMP crystal-line form

named VI-form crystal

was observed in PMP membranes formed by tetrachloroe-thylene or trichloroethylenecontaining solutions.