Technique increases ion exchange capacity of hollow-fiber-substrate ion exchange resins. Procedure increases number of quaternary sites on polyquaternary copolymer by 15 to 35 percent

Rembaum, A.

English

NASA Technical Reports Server

October 1975	 B75-10280 
NASA TECH BRIEF 
NASA Pasadena Office 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Improved Polyelectrolyte for Ion Exchange Fibers 
An improved technique increases the ion exchange 
capacity of hollow-fiber-substrate ion exchange 
resins. These resins are described in NASA Tech Brief 
B75-10117. They are made by impregnating hollow 
fibers with two monomer species which spontaneously 
polymerize in the pores of the fibers. The pores of the 
treated fibers then contain a uniform distribution of 
cross-linked ion exchange molecules. 
A typical monomer pair used to form the resin is 
4-vinyl pyridine and a dihalide. A modification to the 
original procedure has been developed which in-
creases the number of quaternary sites on the 
polyquaternary copolymer by about 15 to 35 percent. 
The improvement is effected by a post-polymerization 
treatment that includes reacting any residually bound 
halogen with an amine to introduce additional 
quaternary groups into the resin. 
The reaction is best carried out with a tertiary 
amine; however, primary or secondary amines may be 
used and followed with a quaternization reaction. 
Typical amines suitable for the process are trimethyl 
amine (TMA), benzyl dimethyl amine, and pyridine. 
If a gaseous amine such as TMA is used, the 
reaction may be conducted at atmospheric or elevated 
pressure by merely placing the preformed cross-linked 
resin in contact with the gas. One method is to
immerse the resin in methanol and to bubble the 
amine gas through the solvent. With liquid amines, 
the reaction may be carried out by immersing the 
resin in the amine or a solution of the amine. The 
reaction proceeds readily at room temperature, but 
the rate increases at higher temperatures (i.e., 400 to 
1000 C). 
Note: 
• Requests for further information may be directed 
to:
Technology Utilization Officer 
NASA Pasadena Office 
4800 Oak Grove Drive 
Pasadena, California 91103 
Reference: TSP75-10280 
Patent status: 
Title to this invention has been waived under the 
provisions of the National Aeronautics and Space Act 
[42 U.S.C. 2457(f)], to the California Institute of 
Technology, Pasadena, California 91109. 
Source: Alan Rembaum of 
Caltech/JPL 
(NPO- 13530) 
S
Category: 04 (Materials) 
This document was prepared under the sponsorship of the National
	
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Improved polyelectrolyte for ion exchange fibers

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