Viscoelastic and mechanical properties of poly(butyl acrylate-g-styrene) copolymers

Viscoelastic relaxations of four poly(butyl acrylate-g-styrene) copolymers were studied over a wide range of temperatures. The temperature location an d apparent activation energy of the distinct relaxations found are discusse d. A single relaxation associated with cooperative motion has been observed in the range of graft content analysed. In addition, the stress-strain beh aviour of these graft copolymers was studied. Films of the copolymer sample s were stretched at room temperature since the possible application as adhe sives might take place at about room temperature. Some mechanical parameter s have been estimated, such as elastic modulus, tensile strength and toughn ess. Moreover, microhardness has been measured and its relationship with ot her mechanical properties has been established. (C) 2001 Elsevier Science L td. All rights reserved.