We detected a correlation between optical and giant radio pulse emission from the Crab pulsar. Optical pulses coincident with the giant radio pulses were on average 3% brighter than those coincident with normal radio pulses. Combined with the lack of any other pulse profile changes, this result indicates that both the giant radio pulses and the increased optical emission are linked to an increase in the electron-positron plasma density.
The critical degree of polymerization (J crit ) at which polymer chains become insoluble in the continuous medium and particle formation commences has been estimated under a variety of experimental conditions for the nitroxide-mediated precipitation polymerizations of styrene (St) at 110°C and tert-butyl acrylate (t-BA) at 118°C in supercritical carbon dioxide (scCO 2 ) mediated by N-tert-butyl-N-[1-diethylphosphono(2,2-dimethylpropyl)]oxy (SG1). The value of J crit increases with increasing target molecular weight, initial monomer loading, and pressure. Under the conditions investigated, J crit for t-BA is higher than that for St, which is consistent with greater solubility of poly(acrylates) in neat scCO 2 . A simple graphical approach has been developed and successfully employed, whereby J crit can be predicted as a function of both target molecular weight and initial monomer loading on the basis of a data set of J crit versus initial monomer loading.
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