Viscosification of Nanoparticle Dispersion via Modulation of the Hydrogen Bonding Mode
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We report a terpolymer composed of a self-complementary hydrogen bonding unit and a solubilizing unit within a PMMA backbone by RAFT copolymerization. Using this polymer, we have devised a kinetic pathway to target the metastable nanoparticle state by inducing intramolecular collapse. By DLS analysis, we confirmed that uniformly dispersed nanoparticles were produced; and with temperature variation, we discovered that these nanoparticles were sensitive to heat and its thermal history. Temperature-dependent 1H-NMR analysis showed that the polymer nanoparticles held together by hydrogen bonding started to loosen above a certain temperature. By exploiting these properties of the polymer nanoparticle in solution, we demonstrate that by applying heat the dispersed nanoparticle in the non-polar solvent gradually releases individual chains and in turn change the macroscopic property of the polymer solution, providing an interesting possibility of controlling polymer solution viscosity.