שאלה | Stress vs. strain curves which are measured when the polymer material has been deformed at a constant rate may be characterized by which of the following characteristics? Which of the following statements is correct? (Choose from the following four possibilities)

Stress vs. strain curves which are measured when the polymer material has been deformed at a constant rate may be characterized by which of the following characteristics? Which of the following statements is correct? (Choose from the following four possibilities)

		In glassy polymers small forces are needed to obtain large strain (deformations)
		If material breaks under a small strain it is said to be tough
		A material is brittle when it breaks under a large strain (deformation)
		Factors which influence toughness are MW, crystallinity and intermolecular forces