Synthesis of Temperature Responsive Poly (N-isopropylacrylamide) Using Ultrasound Irradiation
Boon M Teo, Stuart W Prescott, Gareth J Price, Franz Grieser, Muthupandian Ashokkumar
JOURNAL OF PHYSICAL CHEMISTRY B | AMER CHEMICAL SOC | Published : 2010
Ultrasound was employed to synthesize poly(N-isopropylacrylamide) [poly(NIPAM)] either as aqueous solutions or microgels in the absence of a chemical initiator. Poly(NIPAM) of different microstructures can be readily prepared via ultrasound irradiation by varying the reaction temperature. At a preparation temperature of 20 degrees C, poly(NIPAM) was formed in aqueous solutions, whereas, at a higher preparation temperature (beyond the lower critical solution temperature of approximately 32 degrees C), poly(NIPAM) microgels were formed. In addition, the high shear gradients generated by the acoustic cavitation process aid to control or vary the molecular weights of poly(NIPAM) formed in aqueou..View full abstract
B.T. gratefully acknowledges the receipt of a Melbourne International Research Scholarship, Tom Healy Award, and Postgraduate Overseas Research Scholarship. The financial support from the Particulate Fluids Processing Centre, a Special Research Centre of the Australian Research Council, is also acknowledged.