Although for most basic polymers, the basicity consts. detd. are apparent (i.e., they vary with degree of ionization), those for aminopolyamides [i.a. 3,3'-(methylimino)dipropionic acid-piperazine copolymer [76709-61-0], 3,3'-[ethylenedi(methylimino)]dipropionic acid-piperazine copolymer [73629-76-2]] are effective basicity consts. The potentiometric titrn. of the polyamides is similar to that of model compds. [Me3N, 4,4'-[ethylenebis[(methylimino)ethylenecarbonyl]]dimorpholine [70559-02-3], Me2NCH2CH2NMe2 [110-18-9], MeN(CH2CH2NMe2)2 [3030-47-5]]. The no. of obsd. signals in the 13C NMR indicates a fast equil. between all protonation sites, with no signals resulting from unprotonated species. Protonation sites in a given mer unit are unaffected by those in neighboring units.
Protonation studies of multifunctional polymers with a poly(amido-amine) structure / R., Barbucci; P., Ferruti; C., Improta; Delfini, Maurizio; A. L., Segre; Conti, Filippo. - In: POLYMER. - ISSN 0032-3861. - STAMPA. - 19:11(1978), pp. 1329-1334. [10.1016/0032-3861(78)90317-8]
Protonation studies of multifunctional polymers with a poly(amido-amine) structure
DELFINI, Maurizio;CONTI, Filippo
1978
Abstract
Although for most basic polymers, the basicity consts. detd. are apparent (i.e., they vary with degree of ionization), those for aminopolyamides [i.a. 3,3'-(methylimino)dipropionic acid-piperazine copolymer [76709-61-0], 3,3'-[ethylenedi(methylimino)]dipropionic acid-piperazine copolymer [73629-76-2]] are effective basicity consts. The potentiometric titrn. of the polyamides is similar to that of model compds. [Me3N, 4,4'-[ethylenebis[(methylimino)ethylenecarbonyl]]dimorpholine [70559-02-3], Me2NCH2CH2NMe2 [110-18-9], MeN(CH2CH2NMe2)2 [3030-47-5]]. The no. of obsd. signals in the 13C NMR indicates a fast equil. between all protonation sites, with no signals resulting from unprotonated species. Protonation sites in a given mer unit are unaffected by those in neighboring units.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
