Transport of Organic Vapors in Multiphase Polymer System.

Abstract

Sorption of organic vapors in glassy-rubbery heterophase polymers is investigated using polystyrene (PS)/Polybutadiene (PB) blends and block copolymers. Experimental data on hexane vapor sorption in phase segregated blends (mixture of dispersed PS microspheres in PB matrix) and block copolymers exhibit non-Fickian characteristics that previous workers with PS/PB copolymers attributed to a diffused interphase. These data, plus results from a model of sorption in heterogeneous media containing a slowly permeable dispersed phase, indicate that the mere presence of two phases with different diffusion time constants is a sufficient condition for apparently non-Fickian behavior. A mold of vapor transport in glassy polymer is presented and employed in conjunction with sorption experiments with PS microspheres in order to determine pertinent diffusion and relaxation constants. Keywords: Transport properties, Heterophase polymers, Block copolymers, Organic vapors, Polystyrene, Polybutadiene, Diffusion, Permeation.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1988
Accession Number
ADA194097

Entities

People

  • Jerry H. Meldon
  • Nak-ho Sung

Organizations

  • Tufts University

Tags

DTIC Thesaurus Topics

  • Alkanes
  • Alkenes
  • Block Copolymers
  • Chemical Reactions
  • Classification
  • Composite Materials
  • Copolymers
  • Dielectric Polymers
  • Diffusion Coefficient
  • Experimental Data
  • Materials
  • Materials Laboratories
  • Polymeric Films
  • Polymers
  • Security
  • Steady State
  • Transport Properties

Readers

  • Aerosol Science/Aerosol Physics
  • Polymer Science and Engineering.
  • Reinforced Composite Materials

Technology Areas

  • Microelectronics