שאלה | Free radical polymerization of olefins general forms polymers with a broad range of molecular weights. To overcome this and to form polyolefins having a narrow range of molecular weight by a free radical polymerization which of the following approaches has been successful?

Free radical polymerization of olefins general forms polymers with a broad range of molecular weights. To overcome this and to form polyolefins having a narrow range of molecular weight by a free radical polymerization which of the following approaches has been successful?

		Reversibly blocking the growing chain end with a group that associates and dissociates. .
		b) Adding radical transfer agent
		Controlling the initiation step by using initiators with high efficiency.
		Ensuring that the rate of initiation is equal to the rate of termination.