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Ultrathin, selective polyimide membr...

Sullivan, Daniel M.

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Ultrathin, selective polyimide membranes prepared from layered polyelectrolytes.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Ultrathin, selective polyimide membranes prepared from layered polyelectrolytes./
Author:	Sullivan, Daniel M.
Description:	127 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 1840.
Contained By:	Dissertation Abstracts International65-04B.
Subject:	Chemistry, Analytical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3129546
ISBN:	0496768050

Ultrathin, selective polyimide membranes prepared from layered polyelectrolytes.
Sullivan, Daniel M.

Ultrathin, selective polyimide membranes prepared from layered polyelectrolytes. - 127 p.

Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 1840.

Thesis (Ph.D.)--Michigan State University, 2004.

The work presented in this dissertation applies layer-by-layer techniques and subsequent heat-induced imidization to form ultrathin polyimide films. Two layer-by-layer methods are discussed, one that employs polymers that covalently bond to each other, and another that uses electrostatic interactions for film buildup. The polyimide films presented here were tailored for two areas of application; anti-corrosion coatings and high flux, selective membranes.

ISBN: 0496768050Subjects--Topical Terms:

586156
Chemistry, Analytical.

Ultrathin, selective polyimide membranes prepared from layered polyelectrolytes.
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100 1 $a Sullivan, Daniel M. $3 1938773
245 1 0 $a Ultrathin, selective polyimide membranes prepared from layered polyelectrolytes.
300 $a 127 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 1840.
500 $a Adviser: Merlin L. Bruening.
502 $a Thesis (Ph.D.)--Michigan State University, 2004.
520 $a The work presented in this dissertation applies layer-by-layer techniques and subsequent heat-induced imidization to form ultrathin polyimide films. Two layer-by-layer methods are discussed, one that employs polymers that covalently bond to each other, and another that uses electrostatic interactions for film buildup. The polyimide films presented here were tailored for two areas of application; anti-corrosion coatings and high flux, selective membranes.
520 $a Ultrathin, passivating films are attractive for protecting metal surfaces without completely masking substrate properties. Layer-by-layer covalent deposition of Gantrez(TM)/poly(allylamine) films yields ultrathin amic acid-linked layers that can be imidized by heating. Impedances of Al electrodes coated with Gantrez(TM)/poly(allylamine) films depend on the number of deposited bilayers, and the imidized films increase aluminum oxide resistance by up to two orders of magnitude. These results suggest that increases in film resistance play a role in oxide passivation in this system.
520 $a Low fluxes often restrict practical applications of membrane-based separations. A reduction in the thickness of the membrane increases flux, but currently, thicknesses below 50 nm are difficult to achieve. Alternating polyelectrolyte deposition (APD) offers a simple and convenient method to fabricate ultrathin membrane skins, but the selectivity of polyelectrolyte films is generally low.
520 $a To develop discriminating, ultrathin polyelectrolyte films, we first adsorb poly(amic acid) salts and poly(allylamine hydrochloride) (PAH) on porous alumina. Subsequent heating yields highly selective polyimide membranes. Remarkably, after imidization at temperatures ranging between 150 and 180°C, membranes composed of poly(p-phenylenepyromellitamic acid) and PAH have Cl- /SO42- selectivities as high as 1000 and K+/Mg2+ selectivities of 100--300. The minimal thickness (4 to 9 nm) of these membranes allows fluxes that are 50% of those through the bare porous alumina support.
520 $a For gas separations, we utilized fluorinated polyimides because these materials offer both high selectivity and high permeability. Selectivities (O2/N2 up to 6.9 and CO2/CH4 up to 68) and permeabilities of three different, fully imidized, poly(amic acid)/PAH membranes are comparable to literature values for the corresponding bulk polyimides, even when films are 35 to 40 nm thick.
520 $a We also investigated pervaporation separations of water from alcohol solutions using cross-linked polyimide membranes. The poly(amic acids) employed in these studies contain diaminobenzoic acid groups that can form amide cross-links with the polycation when heated. Water-selective pervaporation separations using cross-linked polyimide membranes are highly selective (water/alcohol selectivities are 1100 and 6100 for solutions containing 10% and 90% isopropanol, respectively) and the fluxes are also high, ranging from 2 to 11 kg·m -2·h-1.
590 $a School code: 0128.
650 4 $a Chemistry, Analytical. $3 586156
690 $a 0486
710 2 0 $a Michigan State University. $3 676168
773 0 $t Dissertation Abstracts International $g 65-04B.
790 1 0 $a Bruening, Merlin L., $e advisor
790 $a 0128
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3129546