שאלה | In gel permeation chromatography for determining molecular weight distribution standard polystyrene polymers are used to calibrate the column. These polystyrene polymer samples are characterized by what type of molecular weight range and how are they generally synthesized? (Choose from the following four possibilities)

In gel permeation chromatography for determining molecular weight distribution standard polystyrene polymers are used to calibrate the column. These polystyrene polymer samples are characterized by what type of molecular weight range and how are they generally synthesized? (Choose from the following four possibilities)

		Each sample is a very narrow molecular weight range made by anionic living polymerization
		Each sample is a broad molecular weight range made by free radical polymerization using peroxides
		Each sample is made by emulsion polymerization with chain transfer agents included. ה
		Each sample made by cationic polymerization with a broad molecular weight range with a random termination step.

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