Potassium persulfate (K2S2O8), as a strongoxidizing agent, has been widely used in the field of polymerization initiator. The following is the application of potassium persulfate in polymerization initiator:
1. Initiator of free radicalpolymerization: Potassium persulfate can produce free radicals in aqueous solution, thereby triggering free radical polymerization. This reaction is very common in the synthesis of polymers such as polyacrylamide (PAAm) and polyacrylic acid (PAA). For example, in the preparation of P(AM-AA)/PVA/PAMPS double-network hydrogels, potassium persulfate is used as an initiator.
2. Synthetic hybrid polymer flocculant:Potassium persulfate and azodiisobulimidazoline hydrochloride (VA-044 initiator) composite initiation system can be used to synthesize
polythioaluminum chloride polyacrylamide (PACS-PAM) hybrid polymer flocculant.
3. Preparation of hydrogel: In thepreparation process of hydrogel, potassium persulfate can be used as an initiator to trigger the polymerization of acrylamide (AAm) monomer in aqueous
solution to form polyacrylamide (PAAm).
4. Temperature responsive polymer microgel:Potassium persulfate can also be used for the preparation of temperature responsive polymer microgels in aqueous phase. N isopropylacrylamide (NIPAM) was used as monomer,N, N-methylene bisacrylamide (MBAAm) as crosslinking agent, sodium dodecyl sulfate (SDS) as surfactant, and potassium persulfate as
initiator.
5. Frozen polymerization: In the frozenpolymerization method, potassium persulfate can be used as an initiator to trigger the polymerization reaction at low temperature to prepare high
molecular weight polymers.
6. Pnipam-based graft copolymer: Potassiumpersulfate can also be used to combine carboxymethyl cellulose with n-isopropyl acrylamide through free radical copolymerization to prepare PNIPAM-based graft copolymer.
7. Study on polymerization kinetics: Theinitiation of the REDOX initiation system composed of potassium persulfate-sodium bisulfite in acrylamide solution polymerization has also been
studied to observe the polymerization kinetics under different initiator dosage and different ratio of sodium bisulfite to potassium persulfate.
These applications demonstrate thediversity and importance of potassium persulfate in the field of polymerization initiators, which can not only trigger polymerization of multiple monomers, but also function under special conditions (such as aqueous phase, low temperature, etc.). With the development of materials science, the application of potassium
persulfate in polymerization initiator may be further expanded and deepened.