%0 Journal Article 
%A Arrieta, Marina Patricia
%A Sessini, Valentina
%A Peponi, Laura
%T Biodegradable poly(ester-urethane) incorporated with catechin with shape memory and antioxidant activity for food packaging
%D 2017
%@ 0014-3057
%U http://hdl.handle.net/10017/43754
%X Biodegradable poly(ester-urethane) (PU) based on a tri-block copolymer  of poly(L-lactic acid) and poly(ɛ-caprolactone), with shape-memory  behaviour, and further loaded with catechin (Cat), as antioxidant agent,  were developed with the dual objective to obtain a smart as well as an  active material for food packaging purpose. Well dispersed catechin  produced somewhat UV blocking effect, but slightly amber and red  tonality. Catechin demonstrated positive interaction with PU matrix  enhancing the interfacial adhesion and leading to a reduction in the  surface wettability. The active PU composites, with thermally-activated  shape memory ability at temperatures close to those required to pack  thermally proceeded food (i.e. 40 °C), showed increased ability to  recover the initial shape of the neat PU matrix. The antioxidant  effectiveness of catechin released after the exposition to a fatty food  simulant was proven after 10 days which represents the worst foreseeable  conditions of the intended use. The disintegration process in  composting conditions of the active PU-based materials was speeded up  due to the catechin incorporation. The PU formulation loaded with low  amount of catechin (1 wt% or 3 wt%) showed enough transparency, enhanced  shape memory behaviour, improved water resistance, reduced UV-light  transmission, right catechin release and effective antioxidant activity  as well as appropriate disintegration in compost. Thus, active PU-Cat  composites result very interesting as smart and active materials for  biodegradable food packaging applications
%K Poly(urethane)
%K Catechin
%K Food packaging
%K Shape-memory
%K Antioxidant
%K Biodegradable
%K Química
%K Chemistry
%~ Biblioteca Universidad de Alcala