Orientation Efforts as Regulatory Factor of Structure Formation in Permeable Porous Poly(vinylidene fluoride) Films  

作　　者：G.K.Elyashevich I.S.Kuryndin I.Yu.Dmitriev V.K.Lavrentyev N.N.Saprykina V.Bukosek 

机构地区：[1]Institute of Macromolecular Compounds,Russian Academy of Sciences,Bolshoi pr.31,St.Petersburg 199004,Russia [2]Faculty for Natural Sciences and Engineering,University of Ljubljana,Snezniska c.5,Ljubljana 1000,Slovenia

出　　处：《Chinese Journal of Polymer Science》2019年第12期1283-1289,I0008,共8页高分子科学（英文版）

摘　　要：The manufacturing process of poly(vinylidene fluoride)microporous films containing through flow channels and permeable to liquids has been elaborated.The process is based on polymer melt extrusion with subsequent stages of annealing,uniaxial extensions("cold"and"hot"drawing),and thermal stabilization.The effect of orientation parameters(melt draw ratio and extension degrees)on overall porosity,permeability,morphology,and content of polar piezoactiveβ-phase in crystalline structure of the films was investigated by filtration porosimetry,sorptometry,scanning electron microscopy,X-ray scattering,and mechanical properties measurements.It is shown that the through pores were formed by a percolation mechanism.It is observed that permeability and theβ-phase content increased with the growth of extension degree at the pore formation stages but the portion ofβ-crystallites decreased with increasing melt draw ratio at extrusion,which permitted to regulate the combination of through permeability and piezoactivity values by variation of the preparation process parameters.The manufacturing process of poly(vinylidene fluoride) microporous films containing through flow channels and permeable to liquids has been elaborated. The process is based on polymer melt extrusion with subsequent stages of annealing, uniaxial extensions("cold" and "hot" drawing), and thermal stabilization. The effect of orientation parameters(melt draw ratio and extension degrees) on overall porosity, permeability, morphology, and content of polar piezoactive β-phase in crystalline structure of the films was investigated by filtration porosimetry, sorptometry, scanning electron microscopy, X-ray scattering, and mechanical properties measurements. It is shown that the through pores were formed by a percolation mechanism. It is observed that permeability and the β-phase content increased with the growth of extension degree at the pore formation stages but the portion of β-crystallites decreased with increasing melt draw ratio at extrusion, which permitted to regulate the combination of through permeability and piezoactivity values by variation of the preparation process parameters.

关 键 词：Poly(vinylidene fluoride) MICROPOROUS FILMS Permeability STRUCTURE-PROPERTY relations Piezoelectric properties 

分 类 号：TG1[金属学及工艺—金属学]