Acrylic acid polymerization kinetics

An In‐Situ NMR Study of Radical Copolymerization Kinetics of Acrylamide and Non‐Ionized Acrylic Acid in Aqueous Solution

“…The faster rates for the 20 and 40 wt% experiments occur from the start of the polymerization, as seen by the initial rates of conversion in Figure . These results are in agreement with the previous AM and AA batch homopolymerization studies, and are indicative of an apparent reaction order with respect to monomer of greater than unity. The expected rate of monomer conversion ( x ) for FRP in a batch reactor is: assuming the reaction is first order with respect to monomer concentration and also with respect to radical concentration.…”

Droplet-Based Millifluidics as a New Miniaturized Tool to Investigate Polymerization Reactions

“…This result is consistent with an 1 / 2 -order with respect to the initial initiator concentration. This behavior was expected and is in good agreement with the literature. − …”

“…From the highest part of their Arrhenius plot, one can calculate an E r of about 49.5 kJ mol −1 , which is closer to our measured E r . On the other hand, Cutié et al obtained E r of about 40.1 kJ mol −1 , within a temperature range above the curvature limit observed on the graph published by Scott and Peppas, up to 85 °C . Scott and Peppas used a lower concentration than we did, i.e.…”

Effect of the pH on the RAFT Polymerization of Acrylic Acid in Water. Application to the Synthesis of Poly(acrylic acid)-Stabilized Polystyrene Particles by RAFT Emulsion Polymerization

“…After the same inhibition period (around 1h), the polymerization rate strongly decreased when the pH was increased from 1.8 to 5.0, but increased again for pH = 7.0 remaining, however, lower than in the case of pH = 1.8 but faster than when pH = 4.0. These results are consistent with observations already made for the free radical polymerization of AA in water 26,27 and the same conclusions on the impact of pH on kp may apply when RAFT is employed. The examination of the ASEC peaks evolution versus conversion gives additional information on the control of the RAFT process (Figure 3).…”