Effect of pH value on the coagulation kinetics of phenol formaldehyde resin dispersion
Source abstract
Abstract
Phenol-formaldehyde resin (PFR) has been synthesized in a reaction catalyzed with NaOH. The molecular structures of PFR were investigated using Fourier transform infrared spectroscopy (FTIR) and high performance liquid chromatography-mass spectrometry (HPLC-MS). In this study, the size of PFR aggregates were measured by a dynamic light scattering technique (DLS) in order to elucidate the dispersion performance of PFR dispersed in water. The coagulation behavior of the PFR aggregates with various pH values, valences and concentrations of H + were investigated using DLS. The highest coagulation rate (ddt) at different pH values followed the order of: acidic > alkaline, which can be explained by the effects of electrostatic repulsion at protonation states of phenolic –OH groups. The coagulation phenomenon appeared at pH values less than 7. The fractal dimension d f ≈ 2.1 could be determined for reaction-linked colloid aggregation (RLCA) when pH < 7. These results indicated that PFR had a coagulation behavior which could be exploited in enhanced oil recovery (EOR) processes.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Petroleum Processing and Analysis · Enhanced Oil Recovery Techniques · Surfactants and Colloidal Systems
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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