Fan, Guanglin published the artcileRubber-like composites with tunable thermal- and photo-responsive shape memory properties, Safety of 1-Bromododecane, the publication is Chemical Engineering Journal (Amsterdam, Netherlands) (2022), 137534, database is CAplus.
Shape memory polymers (SMPs) are crosslinked networks with mol. switches to control network mobility and thus macroscopic deformation. The network crosslinking and the mol. switches make most SMPs behave like hard plastics, with very few exceptions whose extensibilities are comparable to rubbers and elastomers. Here we report a class of composites that comprise polystyrene-b-ethylene-co-butylene-b-styrene (SEBS) as elastic matrixes and azobenzene derivatives (ADs) as mol. switches. The incorporation of the ADs does not impair the extensibility of the SEBS substrates, and the tensile strains of the prepared composites can exceed 900% even when the content of the ADs reaches 30 wt%. The thermal- and photo-responsive solid-liquid transitions of the ADs are responsible for the shape memory effects of the composites. The photo-responsive shape recovery process can be completed within 2 s, and 2D-to-3D shape transformations are realized on the samples fixed with tensile strains by spatiotemporal control of UV irradiation On another aspect, the chem. structures of the ADs can be tailored to regulate their m.ps. and thus the thermal responsive shape memory properties of the composites. Furthermore, different pieces of composites can be combined by hot-pressing to exhibit spatially tailorable thermal responsive shape recovery behaviors. The facile preparation and interesting shape memory properties of the rubber-like composites can inspire the design of soft SMPs with more promising applications.
Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about 143-15-7. 143-15-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromododecane, and the molecular formula is C12H25Br, Safety of 1-Bromododecane.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary