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Issue 37, 2015
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Precise synthesis of thermoreversible block copolymers containing reactive furfuryl groups via living anionic polymerization: the countercation effect on block copolymerization behavior

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Abstract

The anionic block copolymerization of 4,4′-vinylphenyl-N,N-bis(4-tert-butylphenyl)benzenamine (A) with furfuryl isocyanate (B) was carried out using potassium naphthalenide (K-Naph) in tetrahydrofuran at −78 and −98 °C to prepare well-defined block copolymers containing furan groups for the formation of thermoreversible networks via a Diels–Alder (DA) reaction. While no block copolymerization was observed in the absence of sodium tetraphenylborate (NaBPh4) due to side reactions, well-defined poly(B-b-A-b-B) (PBAB) copolymers with controlled molecular weights (Mn = 18 700–19 500 g mol−1) and narrow molecular weight distributions (Mw/Mn = 1.08–1.17) were successfully synthesized in the presence of excess NaBPh4. The occurrence of the undesirable side reactions during polymerization of B was effectively prevented by NaBPh4, which results in the change in the countercation from K+ to Na+ for further polymerization of B. The cross-linking via the DA reaction between the furan groups of PBAB and bismaleimide was proved by FT-IR and differential scanning calorimetry (DSC), and the thermoreversible properties of the cross-linked polymer were subsequently investigated using DSC and solubility testing.

Graphical abstract: Precise synthesis of thermoreversible block copolymers containing reactive furfuryl groups via living anionic polymerization: the countercation effect on block copolymerization behavior

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Publication details

The article was received on 25 Jun 2015, accepted on 05 Aug 2015 and first published on 07 Aug 2015


Article type: Paper
DOI: 10.1039/C5PY00983A
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Polym. Chem., 2015,6, 6732-6738

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    Precise synthesis of thermoreversible block copolymers containing reactive furfuryl groups via living anionic polymerization: the countercation effect on block copolymerization behavior

    B. Kang, N. B. Pramanik, N. K. Singha, J. Lee and J. Mays, Polym. Chem., 2015, 6, 6732
    DOI: 10.1039/C5PY00983A

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