Publikation: Polymorphism and Stretch-Induced Transformations of Sustainable Polyethylene-Like Materials
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Herein we demonstrate that polyethylene-like bioderived, biodegradable, and fully recyclable unbranched aliphatic polyesters, such as PE-2,18, develop hexagonal crystal structures upon quenching from the melt to temperatures <∼50 °C and orthorhombic-like packing at higher quenching temperatures or after isothermal crystallization. Both crystal types are layered. While all-trans CH2 packing characterizes the structure of the orthorhombic-like form, there is significant conformational disorder in the staggered long CH2 sequences of the hexagonal crystals. On heating, the hexagonal crystals transform to the orthorhombic type at ∼60 °C via melt recrystallization, but no change is apparent during heating samples with the orthorhombic form up to the melting point (∼95 °C). The hexagonal structure is of interest not only because it develops under very rapid quenching from the melt but also because under uniaxial tensile deformation it undergoes a stretch-induced transformation to the orthorhombic structure. Compared to deformation of orthorhombic specimens that maintain the same crystal type, such transformation results in larger strains and enhanced strain hardening, thus representing a desired toughening mechanism for this type of polyethylene-like materials.
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JANANI, Hamed, Stephanie F. MARXSEN, Marcel ECK, Stefan MECKING, Kohji TASHIRO, Rufina G. ALAMO, 2024. Polymorphism and Stretch-Induced Transformations of Sustainable Polyethylene-Like Materials. In: ACS Macro Letters. ACS Publications. 2024, 13(2), S. 201-206. eISSN 2161-1653. Verfügbar unter: doi: 10.1021/acsmacrolett.3c00639BibTex
@article{Janani2024Polym-69419, year={2024}, doi={10.1021/acsmacrolett.3c00639}, title={Polymorphism and Stretch-Induced Transformations of Sustainable Polyethylene-Like Materials}, number={2}, volume={13}, journal={ACS Macro Letters}, pages={201--206}, author={Janani, Hamed and Marxsen, Stephanie F. and Eck, Marcel and Mecking, Stefan and Tashiro, Kohji and Alamo, Rufina G.} }
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