Abstract
AbstractSoft and stretchable electronic devices are expected to offer technological advances in the field of robotics, human–machine interfacing, and healthcare. Employing biodegradable elastomers, hydrogels, and nontoxic conductors would add significant value to and minimize the ecological impact of such disposable and transient electronic applications. Here, the biodegradable and photo‐crosslinkable elastomer poly(glycerol sebacic) acrylate (PGSA) is characterized for its use in soft and stretchable electronics. Its mechanical properties are investigated in terms of their chemical composition and compared to commonly used gelatin hydrogels. Furthermore, these materials are combined with interconnects made of liquid Galinstan in order to create functional substrates with certified biodegradability under ISO standards. The combination of these materials produces elastic circuit boards that act as soft platforms for body‐mounted sensors or biodegradable stretchable light‐emitting devices. These soft platforms reveal linear elongations at a break of 130% to 350% and similar moduli to nondegradable elastomers and human tissue, without any decrease in conductivity. Advanced applications in biofriendly packaging, soft robotics, and healthcare will greatly benefit from these biodegradable devices.
Highlights
Soft and stretchable electronic devices are expected to offer technological help to reduce the high amount of global advances in the field of robotics, human–machine interfacing, and healthcare
Our experiments revealed that poly(glycerol sebacic) acrylate (PGSA) with a 28% degree of acrylation (DA) (PGSA-28) exhibited the expected rubber-elasticity of an elastomer but with a much higher E = 592 kPa than gelatin
The mechanical properties of the synthetic polymer PGSA were adjusted by the degree of acrylation and compared to state-of-the-art biodegradable and nonbiodegradable rubber-elastic materials
Summary
Fumarate moieties[37] or using maleic acid as a monomer.[38,39,40,41,42] The photocurability of PGSA has been exploited as a glue for heart surgery[43,44] and as bioinspired structural adhesives.[45]. The removal of triethylamine chloride, which otherwise formed crystals in the final elastomer film, presented an essential step in the synthesis procedure of elastic PGSA This step was not elaborately discussed in previous synthesis protocols[33,34,35] and is detailed in Section S1.3 (Supporting Information). Gelatin forms elastic hydrogel films when processed from aqueous solution, to which we added glycerol as an environmentally friendly plasticizer (details, Supporting Information). Both test volumes of the reference and PGSA-19 revealed a decrease of pH value from 7.0
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