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Issue 54, 2014
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Synthesis and self-assembly behavior of organic–inorganic macrocyclic molecular brushes composed of macrocyclic oligomeric silsesquioxane and poly(N-isopropylacrylamide)

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Abstract

The novel organic–inorganic molecular brush composed of macrocyclic oligomeric silsesquioxane (MOSS) and poly(N-isopropylacrylamide) (PNIPAAm) (denoted by PNIPAAm@MOSS) was synthesized via the atom transfer radical polymerization (ATRP) approach. In bulk, the organic–inorganic molecular brushes were microphase-separated; the spherical MOSS microdomains with the diameter of 10–50 nm were dispersed into a continuous PNIPAAm matrix. Depending on the lengths of PNIPAAm chains, the PNIPAAm@MOSS molecular brushes were capable of self-assembling into cylindrical or spherical nano-objects in aqueous solutions as evidenced by transmission election microscopy (TEM) and dynamic light scattering (DLS). Both micro-differential scanning calorimetry (Micro-DSC) and ultraviolet-visible spectroscopy showed that the MOSS backbones exerted significant restriction of coil-to-globule transition of PNIPAAm chains.

Graphical abstract: Synthesis and self-assembly behavior of organic–inorganic macrocyclic molecular brushes composed of macrocyclic oligomeric silsesquioxane and poly(N-isopropylacrylamide)

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Article information


Submitted
25 Mar 2014
Accepted
03 Jun 2014
First published
06 Jun 2014

RSC Adv., 2014,4, 28439-28450
Article type
Paper
Author version available

Synthesis and self-assembly behavior of organic–inorganic macrocyclic molecular brushes composed of macrocyclic oligomeric silsesquioxane and poly(N-isopropylacrylamide)

Y. Yi and S. Zheng, RSC Adv., 2014, 4, 28439
DOI: 10.1039/C4RA02624A

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