Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Effects of Ionic Strength and Ion Specificity on the Interface Behavior of Poly(dimethylaminoethyl methacrylate)-Poly(lauryl methacrylate)
Δημιουργός/Συγγραφέας:	Chen, Hongxu Wen, Gangyao Chrysostomou, Varvara [EL] Πίσπας, Στέργιος[EN] Pispas, Stergios Li, Hongfei Sun, Zhaoyan
Εκδότης:	American Chemical Society
Ημερομηνία:	2021-02-23
Γλώσσα:	Αγγλικά
ISSN:	0743-7463 1520-5827
DOI:	10.1021/acs.langmuir.0c03424
Άλλο:	33570943
Περίληψη:	The ion specificity effect on the water solubility of poly(N-isopropylacrylamide)-containing copolymers complies with the Hofmeister series, which is applicable to other copolymers or not need to be explored. In this work, effects of ionic strength under acidic conditions and ion specificity under alkaline conditions on the air/water interface behavior of two amphiphilic diblock copolymers poly(dimethylaminoethyl methacrylate)-poly(lauryl methacrylate) (PDMAEMA-PLMA) were systematically studied. Under acidic conditions, the surface pressure-area isotherms of a predominantly hydrophilic copolymer are insensitive to ionic strength. In contrast, the isotherms of a predominantly hydrophobic copolymer successively shift to the large, small, and large molecular area with the increase of ionic strength. Under alkaline conditions, the interfacial stretch degrees of PDMAEMA chains of two copolymers change with salt species and concentrations, which do not comply with the Hofmeister series. All of the Langmuir-Blodgett films of the former copolymer exhibit separate circular micelles. Nevertheless, those of the latter copolymer obtained under alkaline conditions exhibit various distinctive morphologies such as separate circular micelles, large separate PLMA cores within large PDMAEMA domains, and large PLMA domains/aggregates surrounded by short PDMAEMA shells. It can be attributed to the high deformability of PLMA chains, the ion specificity effect on the stretch degree of PDMAEMA blocks, and their underwater solubility upon compression.
Τίτλος πηγής δημοσίευσης:	Langmuir : the ACS journal of surfaces and colloids
Τόμος/Κεφάλαιο:	37
Τεύχος:	7
Σελίδες:	2419-2425
Θεματική Κατηγορία:	[EL] Χημεία (Γενικά)[EN] Chemistry (General) [EL] Οργανική χημεία[EN] Organic chemistry
Λέξεις-Κλειδιά:	Copolymers Ionic strength Isotherms Micelles Salts
EU Grant:	LH2020B014
Κάτοχος πνευματικών δικαιωμάτων:	© 2021 American Chemical Society
Σημειώσεις:	This work was supported by the Natural Science Fund of Heilongjiang Province (no. LH2020B014) and the Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences.
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο