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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

Journal Article · · Polymer Chemistry
DOI:https://doi.org/10.1039/C5PY00983A· OSTI ID:1265842
 [1];  [2];  [2];  [3];  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Indian Inst. of Technology (IIT), Kharagpur (India)
  3. Gwangju Inst. of Science and Technology (Korea, Republic of)
+ Show Author Affiliations

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. We prevented the occurrence of the undesirable side reactions during polymerization of B of NaBPh4, which results in the change in the countercation from K+ to Na+ for further polymerization of B. Moreover, 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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
DOE Contract Number:
AC05-00OR22725
OSTI ID:
1265842
Journal Information:
Polymer Chemistry, Journal Name: Polymer Chemistry Journal Issue: 37 Vol. 6; ISSN PCOHC2; ISSN 1759-9954
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE