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Polymeric Multiporous Materials from Fibrillar Networks
Author(s) -
Dasgupta Debarshi,
Nandi Arun K.
Publication year - 2006
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200650911
Subject(s) - solvent , materials science , porosimetry , chemical engineering , porosity , cyclohexane , polymer , aqueous solution , mesoporous material , miscibility , polymer chemistry , composite material , porous medium , organic chemistry , chemistry , engineering , catalysis
Summary: Poly(vinylidene fluoride) (PVF 2 ) forms thermoreversible gels with liquid alkyl diesters as well as with camphor which is solid at room temperature. The diesters are replaced by another low boiling solvent cyclohexane by solvent exchange technique while camphor is dried just by exposing the material in vacuum to yield highly porous materials. Nano pores are generated as a result of solvent removal from polymer‐solvent intercalates whereas macropores are contributed by percolation of polymer fibrils. The porosity thus created covers a wide range from 3 nm to 400 µm producing multiporous materials. Pores greater than 6 nm are measured by mercury intrusion porosimetry (MIP) and pores of diameter less than 6 nm is observed by N 2 adsorption porosimetry. The dried samples show two melting regions, low temperature hump for porous portion and high temperature peak for bulk portion. The porous materials have the ability to absorb water‐soluble herbicides from around 10‐ppm aqueous solution as indicated in UV spectrophotometric experiment.