Affordable Access

Publisher Website

Acrylonitrile–sodium methallylsulfonate copolymer. DSC approach to membrane porosity of foam and hollow fibers

Authors
Journal
Biomaterials
0142-9612
Publisher
Elsevier
Publication Date
Volume
24
Issue
1
Identifiers
DOI: 10.1016/s0142-9612(02)00275-2
Keywords
  • Hemodialysis
  • Acrylonitrile Copolymer
  • Membrane
  • Porosity
  • Dsc

Abstract

Abstract The porosity of membranes formed from acrylonitrile–sodium methallylsulfonate copolymer was characterized from the analysis of the depression of the melting point of absorbed water. Membranes were obtained either as a foam or as a hollow fiber; the foam consisted of interconnected macrocavities (mean diameter about equal to 1 mm) while the hollow fiber was a symmetric membrane used for blood ultrafiltration. Differential scanning calorimetry (DSC) of water revealed both the Gaussian distribution of pore sizes and correspondingly, their mean size: 5.2 nm for the pores through the walls separating macrocavities in the foam and 5.6 and 10.6 nm associated with two distributions representing nearly equal amounts of absorbed water, for the hollow fiber. In addition to DSC, the water magnetic relaxation showed that the isothermal dehydration of the foam was due to the deswelling of macrocavities while the increasing amount of absorbed water in pores reflects its strong interaction with the polymer.

There are no comments yet on this publication. Be the first to share your thoughts.