Unique shape memory behavior of polyolefinic blends with special reference to creep behavior, stress relaxation, and melt rheological study

Abstract

Creep response, stress relaxation behavior, and melt rheological study of the shape memory polymer blend based on EOC-EPDM has been studied in details. In this study, especially the effect of the crosslinks formation in presence of electron beam on the creep response, melt rheological study and stress relaxation behavior has been reported. With increase of electron beam dose, creep response becomes lower and the creep compliance value also comes down. Higher resistance creep response of the radiation crosslinked blends indicates the superior shape recovery behavior of the blends. Stress relaxation behavior of the crosslinked blend also shows the lower decay of stress value with time for higher radiation crosslinked blend. The lower relaxation ratio of the highly radiation crosslinked blend also supports the superior shape recovery behavior of the crosslinked blend. Apart from, melt rheological study shows the higher storage modulus value and higher complex viscosity of the radiation crosslinked blend which also supports the formation of higher crosslinked network structure. Tension set value also clearly indicates the better shape recovery behavior of the crosslinked blend. POLYM. ENG. SCI., 58:876-885, 2018. FIG. 5. With respect to frequency (a) complex modulus, (b) tan d, and (c) complex viscosity plot of crosslinked P25R75 blends. [Color figure can be viewed at wileyonlinelibrary.com]

Dynamically vulcanized blends of UHM-EPDM and polypropylene: Role of nano-fillers improving thermal and rheological properties

“…Heating rate was 10 °C/ min. Tests were performed from ambient temperature to 600 °C under a N 2 atmosphere [16,17].…”

A relative study of the effect of static and dynamic vulcanization upon shape memory nature of thermally actuated peroxide crosslinked polyolefinic blends

“…In the previous study, the author has focused on the effect of electron beam irradiation on the shape memory effect (SME) of EOC‐EPDM blend and the shape memory behavior of uncrosslinked and electron beam crosslinked EOC‐EPDM blend was discussed in details. [ 25,26 ] Following that shape memory behavior of electron beam crosslinked alpha olefinic blends having dual network structure was also studied. [ 27 ]…”

Influence of the curing system on the physical-mechanical, dynamic properties, and aging resistance of ethylene–propylene–diene monomer formulations for applications at high temperatures

“…With the maintenance of stress, the creep phenomenon occurs and the deformation reaches a plateau, representing the viscoelastic component. 44 The recovery of the deformation when the load is removed occurs in a similar way, and it is possible to observe that the formulations come into balance quickly, generating a flat region in the graph, which is typical of cured samples.…”