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Effect of electron beam radiation on tensile and viscoelastic properties of styrenic block copolymers
Author(s) -
Wu Jinping,
Soucek Mark D.,
Cakmak Mukerrem
Publication year - 2014
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.23859
Subject(s) - materials science , styrene , ultimate tensile strength , copolymer , composite material , polymer chemistry , styrene butadiene , viscoelasticity , beam (structure) , radiation , polymer , optics , physics
The effect of electron beam (E‐beam) radiation on a series of styrenic block copolymers (SBCs) was investigated. These SBCs included newly developed poly(styrene‐ block ‐isoprene/butadiene‐ block ‐styrene) (SIBS), poly(styrene‐ block ‐butadiene‐ block ‐styrene) (SBS), and poly(styrene‐ block ‐isoprene‐ block ‐styrene) (SIS). The tensile properties, stress relaxation, molecular weight, and dynamical mechanical properties were studied. Generally, the crosslink density and tensile moduli of SBCs increased with increasing of E‐beam radiation dose. The tensile strength of SIBS and SIS was shown to first decrease at lower E‐beam radiation dose (<120 kGy) and then increase at higher radiation dose (>190 kGy). The tensile strength of SBS was significantly decreased at high E‐beam radiation dose (>190 kGy). This was attributed to the differences between entanglement before E‐beam radiation and the homogeneity of the crosslink network after exposure. POLYM. ENG. SCI., 54:2979–2988, 2014. © 2014 Society of Plastics Engineers