摘要:

Poly(4-vinylpyridine), both as a linear polymer and as a cross-linked resin was quaternized with methyl iodide (I, II) and reduced with sodium borohydride to poly(4-vinyltetrahydropyridine) (III, IV). The remaining double bonds in 111 or IV were inert to catalytic hydrogenation and to reduction with diborane or diimide. Catalytic hydrogenation of linear poly(4-vinylpyridine), quaternized with methyl iodide (I), gave irreproducible results; however, the fully saturated linear poly(4-vinylpiperidine) (V) was obtained in one experiment. Polyamine resins were also prepared by reacting dibromohexane with tetramethylene diamine (VI) and by reacting epichlorohydrin with tetramethylene-diamine (VII). The suitability of all these polyamines as the mine component in thermally regenerable resin systems was examined. The polyamines III, N, VI, and VII oxidized faster than polystyrene-based polyamines whereas V oxidized much more slowly. The amine capacities were all greater than polystyrene-based polyamines and were at least equal to those of poly(alkyldiallylamine)s.

ISSN:0022-233X    

DOI:10.1080/00222338208056472

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

The effect of the type and amount of cross-linker, the monomer concentration, and the method of polymerization on the properties of some mine resins was studied. Resins were prepared by the free-radical initiated copolymerization of diallylamine or methyldiallylamine with a cross-linker such as 1,6-bis(N,N-dially1amino)hexane or triallylamine. Particular attention was given to controlling the factors responsible for the formation of pendant allyl groups in the resins since the presence of these groups is undesirable because they react with sulfite. Low monomer concentrations favored resins with low allyl content but the yield was also low. The best way of minimizing the number of pendant allyl groups is to use low levels of cross-linker. A resin with a very low pendant allyl group content, and therefore resistant to sulfite attack, was prepared from methyldiallylamine and 5 mol% 1,6-bis(N,N-dially1amino)hexane.

ISSN:0022-233X    

DOI:10.1080/00222338208056473

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Weak acid ion exchangers prepared by graft polymerization of acrylic acid on cross-linked PVA microbeads containing magnetic iron oxide were converted to strong or weak base resins by reaction with glycidyltrimethylammonium chloride or with epichlorohydrin and diethylamine, respectively. Capacities up to 2.6 meq/g were obtained, but the products were susceptible to alkaline hydrolysis. Comparable resins prepared by grafting substituted methacrylic esters hydrolyzed more slowly, indicating that hydrolysis occurred at the ester linkage.

ISSN:0022-233X    

DOI:10.1080/00222338208056474

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

ISSN:0022-233X    

DOI:10.1080/00222338208056461

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor