Abstracts Book - IMRC 2018

• SB1-P065
A SOLUBLE AND CONCDUCTIVE POLYANILINE COPOLYMER
HAVING SYNERGISTIC NIR LIGHT ABSORPTION AND LOWER
CRITICAL TEMPERATURE (LCST)
Silvestre Bongiovanni Abel 1 , Maria Alejandra Molina 1 , Claudia R. Rivarola 1 , Cesar Alfredo
Barbero 1
1
Instituto de Investigaciones en Tecnologias Energeticas y Materiales Avanzados (UNRC-
CONICET), Chemistry, Argentina.
A linear block copolymer (PNIPAM-b-PANI), containing a thermosensitive block
(poly(N‑isopropylacrylamide, PNIPAM) and a NIR light absorbing
block (polyaniline, PANI), is synthesized. A PNIPAM block terminated in an aniline
moiety is first made by radical polymerization of NIPAM using p-aminethiofenol
as chain transfer agent. Then, the PANI block is grown the PNIPAM block by
oxidative polymerization of aniline. The copolymer is soluble in aqueous and
non-aqueous solvents, where PNIPAM is soluble, unlike PANI. Thin films of the
copolymer are electrically conductive suggesting that the PANI blocks are
electrically connected. Besides, studies using H 1 -NMR and FT-IR spectroscopies
confirm the proposed structure. We propose that the PANI block act as lightheat
transductor, thus after absorbtion of NIR light, the produced heat should
triggers the colapse of the PNIPAM block. Indeed, it is shown that the soluble
polyaniline aggregate upon NIR light irradiation. The photothermal induced
aggregattion occurs in solution, as shown by turbidimetry, and in thin films, as
shown by atomic force microscopy. Therefore, PNIPAM-b-PANIÂ could be
applied in photothermal therapy, sensors/actuators devices, and in responsive
surfaces/coatings.
Acknowledgment:
S. Bongiovanni Abel thanks CONICET for a graduate study fellowship. M. Molina,
C. R. Rivarola and C. A. Barbero are permanent research fellows of CONICET.
This work was funded by FONCYT, CONICET, SECYT-UNRC, MinCyT (Córdoba,
Argentina).
Keywords: Block copolymer, Thermosensitive, Phothothermal
Presenting authors email: cesarbarbero@gmail.com