Accession Number:

ADA533377

Title:

Functional Polymeric Membranes Based on Self-Assembling of Synthetic Stimuli-Responsive Polymers

Descriptive Note:

Final rept. 2 May 2007-24 Apr 2008

Corporate Author:

OAK RIDGE NATIONAL LAB TN

Personal Author(s):

Report Date:

2010-06-16

Pagination or Media Count:

8.0

Abstract:

Stimuli-responsive functional polymeric membranes with controlled structures and properties have applications for the military as well as civilians in a range of fields. In this project, polymeric films with arrays of nanoscale and thermal-switchable pores based on self-assembling of block copolymer are formed. The block formed the matrix is random copolymer of styrene and 4-vinylbenzocyclobutene 4-VBCB 41 molar ratio. The other block is the random copolymer of bis- and trisethylene glycol methacrylate EO2,3MA with a tuned lower critical-solution temperature LCST at 38 C the LCST of 1wt PEO2MA in water is 24 C, 1wt PEO3MA in water is 48 C. These PSt-r-4-VBCB-b-EO2MA-r- EO3MA copolymers were synthesized by controlled atom transfer radical polymerizations. Polymeric membranes were prepared by casting blends of PSt-r-4-VBCB-b-EO2MA-r- EO3MA and polyN-vinylpyrollidone wt of PVP 16-22. The as-casted films were annealed at 180 C for 5 days and 220 C for two hours under argon. After rinsing the films with THFmethanol 82, membranes with arrays of thermal-switchable pores were formed. Preliminary tests of water filtration using these films proved the proposed concept of principle. Much better performance is expected when the block copolymer compositions, the composition of blend, and membrane preparation conditions are optimized.

Subject Categories:

  • Biochemistry
  • Medicine and Medical Research
  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE