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Issue 2, 2012
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Synthesis of novel cylindrical bottlebrush polypseudorotaxane via inclusion complexation of high density poly(ε-caprolactone) bottlebrush polymer and α-cyclodextrins

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Abstract

Poly(ε-caprolactone) (PCL) macromonomers (MMs) with norbornenyl end groups were synthesized viaring-opening polymerization (ROP) of ε-caprolactone using stannous 2-ethylhexanoate (Sn(Oct)2) as catalyst. Then ring-opening metathesis polymerization (ROMP) of these MMs was carried out using the highly active, fast-initiating ruthenium olefin metathesis catalyst (H2IMes)(pyr)2(Cl)2RuCHPh to form high molecular weight (Mn = 420–1346 kDa) and high density PCL bottlebrush polymers. The inclusion complexation of the prepared PCL bottlebrush polymers and α-cyclodextrins (α-CDs) afforded the novel bottlebrush polypseudorotaxanes with a length of 350 ± 50 nm and a width of 50 ± 10 nm. The formation of bottlebrush polypseudorotaxane was confirmed by nuclear magnetic resonance (NMR) spectroscopic analysis, X-ray diffractogram analysis and dynamic light scattering (DLS) measurements. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) showed that the bottlebrush polypseudorotaxane displays higher thermal stability and weaker melting and crystallization behavior in comparison to its PCL bottlebrush precursor. Transmission electron microscopy (TEM) revealed that the resultant bottlebrush polypseudorotaxanes possess a unique elongated cylindrical morphology.

Graphical abstract: Synthesis of novel cylindrical bottlebrush polypseudorotaxane via inclusion complexation of high density poly(ε-caprolactone) bottlebrush polymer and α-cyclodextrins

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Publication details

The article was received on 14 Aug 2011, accepted on 23 Oct 2011 and first published on 11 Nov 2011


Article type: Paper
DOI: 10.1039/C1PY00362C
Polym. Chem., 2012,3, 343-351

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    Synthesis of novel cylindrical bottlebrush polypseudorotaxane via inclusion complexation of high density poly(ε-caprolactone) bottlebrush polymer and α-cyclodextrins

    Q. Fu, Jing. M. Ren and Greg. G. Qiao, Polym. Chem., 2012, 3, 343
    DOI: 10.1039/C1PY00362C

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