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Amphiphilic networks based on cross-linked star polymers: a small-angle neutron scattering study.

Authors
  • Vamvakaki, Maria
  • Patrickios, Costas S
  • Lindner, Peter
  • Gradzielski, Michael
Type
Published Article
Journal
Langmuir : the ACS journal of surfaces and colloids
Publication Date
Oct 09, 2007
Volume
23
Issue
21
Pages
10433–10437
Identifiers
PMID: 17824716
Source
Medline
License
Unknown

Abstract

Four different polymer model networks of identical molecular architecture based on cross-linked stars (CLSs) were investigated by small-angle neutron scattering (SANS). One of the model networks was a hydrophilic homopolymer CLS of 2-(dimethylamino)ethyl methacrylate (DMAEMA), and the other three were amphiphilic copolymer CLS co-networks of DMAEMA and hydrophobic methyl methacrylate (MMA): one based on a star with random copolymer arms and the other two based on heteroarm star copolymers. For the homopolymer and random copolymer star networks, the scattering curves show shoulders at low values of the scattering vector, indicating very small compacted domains with radii of 1.0-1.3 nm, with the random copolymer star co-network having somewhat larger domains. For the heteroarm star co-networks, pronounced peak maxima are observed because of a much higher degree of microphase structuring than for the other two co-networks. The scattering patterns are described by the presence of well-defined hydrophobic domains with radii of 7.1 and 10.3 nm in the two heteroarm star co-networks, respectively, thereby proving pronounced microphase separation in these systems.

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