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Polymers 2016, 8(4), 145; doi:10.3390/polym8040145

Modification of Spherical Polyelectrolyte Brushes by Layer-by-Layer Self-Assembly as Observed by Small Angle X-ray Scattering

1
State-Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
2
Engineering Research Center of Xinjiang Bingtuan of Materials Chemical Engineering, Shihezi University, Xinjiang 832000, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Christine Wandrey and Ruth Freitag
Received: 31 January 2016 / Revised: 14 March 2016 / Accepted: 8 April 2016 / Published: 15 April 2016
(This article belongs to the Collection Polyelectrolytes)
View Full-Text   |   Download PDF [4109 KB, uploaded 15 April 2016]   |  

Abstract

Multilayer modified spherical polyelectrolyte brushes were prepared through alternate deposition of positively charged poly(allylamine hydrochloride) (PAH) and negatively charged poly-l-aspartic acid (PAsp) onto negatively charged spherical poly(acrylic acid) (PAA) brushes (SPBs) on a poly(styrene) core. The charge reversal determined by the zeta potential indicated the success of layer-by-layer (LBL) deposition. The change of the structure during the construction of multilayer modified SPBs was observed by small-angle X-ray scattering (SAXS). SAXS results indicated that some PAH chains were able to penetrate into the PAA brush for the PAA-PAH double-layer modified SPBs whereas part of the PAH moved towards the outer layer when the PAsp layer was loaded to form a PAA-PAH-PAsp triple-layer system. The multilayer modified SPBs were stable upon changing the pH (5 to 9) and ionic strength (1 to 100 mM). The triple-layer modified SPBs were more tolerated to high pH (even at 11) compared to the double-layer ones. SAXS is proved to be a powerful tool for studying the inner structure of multilayer modified SPBs, which can establish guidelines for the a range of potential applications of multilayer modified SPBs. View Full-Text
Keywords: spherical polyelectrolyte brushes; layer-by-layer deposition; small X-ray scattering spherical polyelectrolyte brushes; layer-by-layer deposition; small X-ray scattering
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tian, Y.; Li, L.; Han, H.; Wang, W.; Wang, Y.; Ye, Z.; Guo, X. Modification of Spherical Polyelectrolyte Brushes by Layer-by-Layer Self-Assembly as Observed by Small Angle X-ray Scattering. Polymers 2016, 8, 145.

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