Abstract
NMR imaging has been used to examine travelling waves of benzoyl peroxide initiated methacrylic acid polymerization. The polymer/monomer interface is sharply defined (<1.2 mm) and is characterized by an abrupt discontinuity in the NMR spin-spin relaxation time constant (T 2 ). The front velocity measured from a series of one-dimensional magnetization profiles is 0.61 cm/min. The polarizing magnetic field B 0 has little or no effect on the observed velocity
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