Self-healing Properties of PLA Bilayer Film: Poly(urea-formaldehyde) Microcapsules Containing Linseed Oil

The development of bio-plastics (i.e., biodegradable and bio-based plastics) is an important way of reducing fossil-based plastic waste. However, the degradable properties that make bio-plastic useful also provide it with significant resistance to commercial use, especially with respect to catastrophic mechanical failure in response to external stimulus. This study develops a functional biodegradable film with bi-layers (PBFs) to achieve both biodegradable features and mechanical stability by incorporating self-healable microcapsules. To improve the scratch-resistance, microcapsules comprised of a poly urea-formaldehyde (PUF) shell and a linseed oil (LO) core are infiltrated to the protective poly dimethylsiloxane (PDMS) layer. When external pressure causes damage to the microcapsule, internal linseed oil (LO) flows out and crosslinks the biodegradable polylactic acid (PLA) film in the presence of oxygen. Several parameters, such as capsule size, content, and curing temperature, are examined. In summary, the embedding of 5 wt% self-healing microcapsules yielded a healing efficiency of 94% at 70 oC in 20 min.

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Self-healing Properties of PLA Bilayer Film: Poly(urea-formaldehyde) Microcapsules Containing Linseed Oil

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