שאלה | Mixtures of polymers are called blends. Which of the following is a true about the difference between miscible and non miscible blends? (Choose from the following four possibilities) .

Mixtures of polymers are called blends. Which of the following is a true about the difference between miscible and non miscible blends? (Choose from the following four possibilities) .

		Miscible blends have two different Tg for each polymer and the non miscible blend one Tg.
		Miscible blends are characterized by a two phases and non-miscible blends by one phases.
		Additives are needed to reduce interfacial energy in miscible blends and thus domain size and to prevent interface voids.
		The free energy of mixing in a miscible blend is negative and in a non miscible blend positive.