Structure-Property Relationship in Terms of Dynamic Mechanical Properties of High Energy Radiation Treated Industrially Important Thermoplastic Elastomer Blend

Abstract

A series of low-density polyethylene (LDPE)/ethylene propylene diene terpolymer (EPDM) blends with various compositions have been prepared by melt mixing followed by injection molding. These specimens are irradiated at 40, 80, 120 and 160 kGy electron beam radiation. The gel content increases with increase in EPDM and as well as EB dose. Storage modulus (E') and loss modulus (E") are decreased with increase in EPDM content. Storage modulus continues to increase and loss modulus keeps on decreasing with radiation dose. Interestingly, damping property is found to be more for EPDM rich blends, which again decreases upon irradiation. Morphology of fractured surface of LDPE/EPDM shows that with increase in EPDM content, the size and depth of the cavity becomes larger and deeper indicating higher ductility. But, EB crosslinking makes the surface smoother and the smoothness keeps on increasing with increase in dose rendering stiffness to the samples.

Compatibilization of an immiscible blend of EPDM and POM with an Ionomer

“…The cured blends display thermoplastic-like behavior (Figure 7(e)), which is very common for thermoplasticelastomer blends. 20 The elastic modulus for the EPDM: POM sample increased relative to neat EPDM, but σ max decreased, as expected, indicating poor stress transfer to the POM dispersed phase. It can be supposed that the dispersed phase acts as stiffener for the EPDM matrix obstructing EPDM chain sliding, but it does not improve tensile strength due to a weak interface, again confirming the immiscibility of the EPDM/POM system, 12 as seen from the FTIR measurements.…”

“…16 EPDM is elastic and has good aging resistance [17][18][19] and POM has high hardness, good fatigue life under cyclic loadings, a low coefficient of friction (with inherent lubricity), good resilience, tensile strength, and stiffness over a wide temperature range. 20,21 POM/EPDM blends, where POM is the major phase, are immiscible, having well separated domains with strong interfacial tension. Moreover, an increase in the EPDM content results in a decrease in tensile strength and elastic modulus, while impact strength and elongation at break reaches a maximum at low EPDM content, i.e.…”

Durability and Electrical Conductivity of Carbon Fiber Cloth/Ethylene Propylene Diene Monomer Rubber Composite for Active Deicing and Snow Melting

“…The subsequent high temperature treatment had little effect on the mechanical properties of conductive EPDM rubber composite material. Because the heating temperature is relatively low and the high temperature aging resistance of EPDM rubber is good [36], there is no phenomenon in which the performance of the rubber composite material is degraded. It is less likely that special high temperatures will occur on roads, and the duration will not be long.…”

Modified ethylene‐propylene‐diene elastomer (EPDM)‐contained silicone rubber/ethylene‐propylene‐diene elastomer (EPDM) blends: Effect of composition and electron beam crosslinking on mechanical, heat shrinkability, electrical, and morphological properties

“…Polymer blends are capable in both harsh and normal environment stresses . Ethylene‐propylene diene rubber (EPDM) has saturated main backbone chain structure, due to which it shows excellent electrical properties, good heat resistance, good mechanical properties, heat shrinkage, and weathering properties such as oxidation and ozone resistance . In silicone elastomer (Si), Si‐O bond has less alkyl group and bond length is also larger than that of CC bond, due to which it has weak molecular force in polymeric chain structure.…”