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Authors
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Radusch, H. J. ; Kolesov, I. ; Gohs, U. ; Heinrich, G.
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Title
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Multiple shape-memory behavior of polyethylene/polycyclooctene blends cross-linked by electron irradiation
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Date
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01.01.2013
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Number
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34942
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Abstract
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Comparative investigation of the thermo-induced unconstrained shape-memory (SM) recovery of a multi-phase semi-crystalline covalent network was performed using cross-linked polyolefin based blends of linear high density polyethylene (HDPE) and/or short-chain branched ethylene octen copolymers (EOC) as well as polycyclooctene (polyoctenamer, TOR). Different phase morphologies of the blends were generated by variation of blend composition and different pathways for sample preparation: Melt mixing of blends, compression molding of films, slowly cooling or quenching of films and subsequent cross-linking by electron irradiation at room temperature. Partly well developed triple- and quadruple SM behavior after one-step programming process was demonstrated for binary and ternary HDPE/EOC/TOR blends, which exhibit a morphology with segregated phases, where the matrix has the lower melting and correspondingly switching temperature (Tm and Tsw) in comparison to the disperse phases. These blends show pronounced steps of SM strain recovery and storage modulus as well as distinct DSC melting peaks. The peaks of SM recovery rate are located in the Tm range of the blend phases. The quenching procedure resulted in a better phase separation at nano-level and correspondingly in a more pronounced triple-shape behavior of the blends. All HDPE/EOC/TOR blends showed high values of strain fixing and strain recovery ratios of 95 to 99 %.
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Publisher
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Advances in Science and Technology
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Wikidata
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Citation
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Advances in Science and Technology 77 (2013) 307-312
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DOI
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https://doi.org/www.scientific.net/AST.77.307
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