Reversible Thermo-Optical Response Nanocomposites Based on RAFT Symmetric Triblock Copolymers (ABA) of Acrylamide and -Isopropylacrylamide and Gold Nanoparticles

Overview

Journal Polymers (Basel)

Publisher MDPI

Date 2023 Apr 28

PMID 37112110

Authors

Nery M Aguilar

Jose Manuel Perez-Aguilar

Valeria J Gonzalez-Coronel

Hugo Martinez-Gutierrez

Teresa Zayas Perez

Enrique Gonzalez-Vergara

Brenda L Sanchez-Gaytan

Guillermo Soriano-Moro

Affiliations

Soon will be listed here.

Abstract

The development of composite materials with thermo-optical properties based on smart polymeric systems and nanostructures have been extensively studied. Due to the fact of its ability to self-assemble into a structure that generates a significant change in the refractive index, one of most attractive thermo-responsive polymers is poly(-isopropylacrylamide) (PNIPAM), as well as its derivatives such as multiblock copolymers. In this work, symmetric triblock copolymers of polyacrylamide (PAM) and PNIPAM (PAM--PNIPAM--PAM) with different block lengths were prepared by reversible addition-fragmentation chain-transfer polymerization (RAFT). The ABA sequence of these triblock copolymers was obtained in only two steps using a symmetrical trithiocarbonate as a transfer agent. The copolymers were combined with gold nanoparticles (AuNPs) to prepare nanocomposite materials with tunable optical properties. The results show that copolymers behave differently in solution due to the fact of variations in their composition. Therefore, they have a different impact on the nanoparticle formation process. Likewise, as expected, an increase in the length of the PNIPAM block promotes a better thermo-optical response.

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