Journal
POLYMER CHEMISTRY
Volume 6, Issue 37, Pages 6732-6738Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5py00983a
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Funding
- GIST-Caltech Research Institute Program at GIST
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
- UGC, New Delhi, India
- USIEF
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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 degrees 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 (M-n = 18 700-19 500 g mol(-1)) and narrow molecular weight distributions (M-w/M-n = 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.
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