A Thermodynamic Method to Study the Interaction Between NaOH and Highly Carboxylated Polymeric Particles in Solution

Abstract

International audienceOne of the most important challenges facing nanotechnology is to identify methods that relate the synthesis of nanomaterials with their final applications. This work proposes a thermodynamic method to understand the stimuli–response of functionalized polymeric particles with NaOH using the partial volumes of interaction, partial compressibilities of interaction, partial enthalpies of interaction and the average hydrodynamic diameter. These properties have been calculated from experimental measurements made by mechanical oscillation densimetry, the sound speed technique, isothermal titration calorimetry, dynamic light scattering and zeta potential. The thermodynamic method allows determination of how and where the interactions take place on the polymeric particles. From the methodological point of view, the thermodynamic fundamentals of the method were tested by simulating the partial properties calculated from volumetric data of a ternary liquid mixture taken from the literature

Determination of Thermodynamic Partial Properties in Multicomponent Systems by Titration Techniques

“…From t f3 =0t o around 0.05 (see Figure 4B), there is an increment in Δv 2,1,3 which can be interpreted as a gain of free volume by the disentanglement of the polymeric chains. This increment of free volume is accompanied by an increment in the hydrodynamic radius [4]. From around t f3 = 0.05 to around 0.1, there is a decrement in Δv 2,1,3 due to hydration.…”

“…(93). The numerical method employed to calculate the derivatives is shown elsewhere [4]. Figure 4 shows the values of Δv S;1 , Δv 2;1,3 and Δv 3;1,2 , and Figure 5 shows the values of Δk s S;1 , Δk s 2;1,3 and Δk s 3;1,2 obtained in a similar way than for volumes.…”

“…As an example, we will consider the interaction between functionalized polymeric particles and an electrolyte at 30 C [4]. For that, polymeric particles synthesized of poly(n-butyl acrylate-co-methyl methacrylate) functionalized with different concentrations of acrylic acid were used in this study.…”

“…Polymeric particles were located in the titration cell, and electrolyte was located in the syringe. Concentrations of polymeric particles (c 2 ) and electrolyte (c 3 ) after each titration were calculated as [4,5]:…”

“…The contribution k T 2;1/free is positive, and the contribution k T 2;1/hyd is negative [4,8]. In this chapter, we will take the adiabatic compressibility as an approximation of the isothermal …”