Self-stratifying coatings: A review

Beaugendre, A; Degoutin, Stéphanie; Bellayer, Séverine; Pierlot, Christel; Duquesne, Sophie; Casetta, Mathilde; Jimenez, Maude

doi:10.1016/j.porgcoat.2017.03.011

Cited by 60 publications

(48 citation statements)

References 32 publications

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“…On the other hand, the granular structures, which are preassembled before secretion, appear unaltered by this process. This behavior, which is similar to that seen in standard covalent-crosslinking thermosets, shows that cuticle assembly bears strong similarities to a solvent-free, Type III self-stratified coating 31 – 33 , in that one substance initially phase-separates and the other subsequently cures (i.e., prior condensation of the granules in the foot, and matrix crosslinking during the molding process). Moreover, this explains the rapid processing time and lack of contamination between layers and further clarifies why an elevated matrix stiffness vis-à-vis the granules is observed, as stiff (i.e., cured) covalent crosslinks would predominate in the former versus dynamic metal-catechol complexes in the latter.…”

Section: Resultssupporting

confidence: 63%

Intertidal exposure favors the soft-studded armor of adaptive mussel coatings

2018

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The mussel cuticle, a thin layer that shields byssal threads from environmental exposure, is a model among high-performance coatings for being both hard and hyper-extensible. However, despite avid interest in translating its features into an engineered material, the mechanisms underlying this performance are manifold and incompletely understood. To deepen our understanding of this biomaterial, we explore here the ultrastructural, scratch-resistant, and mechanical features at the submicrometer scale and relate our observations to individual cuticular components. These investigations show that cuticle nanomechanics are governed by granular microinclusions/nanoinclusions, which, contrary to previous interpretations, are three-fold softer than the surrounding matrix. This adaptation, which is found across several related mussel species, is linked to the level of hydration and presumed to maintain bulk performance during tidal exposures. Given the interest in implementing transfer of biological principles to modern materials, these findings may have noteworthy implications for the design of durable synthetic coatings.

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Section: Resultssupporting

confidence: 63%

Intertidal exposure favors the soft-studded armor of adaptive mussel coatings

2018

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“…It can clearly be seen that all prepared membranes exhibit a bilayer structure with different morphology features. As is known from self‐stratification theory, the upper layer of the PGE/SR membranes was mainly assigned to the SR constituent, whereas the lower layer was basically attributed to the PGE constituent. To confirm this conjecture, elemental compositions in the two‐sided surface of the PGE/SR bilayer membranes were determined by SEM energy‐dispersive X‐ray spectroscopy mapping, and the corresponding element contents are illustrated in File S1, Table S1.…”

Section: Resultssupporting

confidence: 85%

“…The theoretical mechanism is that a homogeneous mixture of two incompatible polymers with diverse properties can form a bilayer structure by separate driving forces (e.g. surface tension gradient, selective substrate wetting, contraction forces and so on) . Gelatin (GE), an important collagen derivative, has been widely used in skin regeneration because of its high hydrophilicity, good biosafety, biodegradability and film forming ability .…”

Section: Introductionmentioning

confidence: 99%

Influence of the weight ratio of polydimethylsiloxane modified gelatin to silicone rubber on the potential performance of asymmetric bilayer membranes as wound dressings

Zhang

2019

Polymer International

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Asymmetric bilayer membranes have been regarded as ideal wound dressings for skin regeneration. Our previous work reported the potential advantages of polydimethylsiloxane modified gelatin/silicone rubber (PGE/SR) asymmetric bilayer membrane as a wound dressing. However, it is still unknown whether the proportion of the two components of the bilayer membrane has a prominent influence on its relevant performance. Herein, various PGE/SR membranes with different PGE:SR weight ratios (100:25, 100:50 and 100:100) were fabricated through a self‐stratification method driven by surface tension gradients. Subsequently, the effects of the PGE:SR ratios on the relevant performance (i.e. porous structure, mechanical properties, degradability and biocompatibility) of PGE/SR membranes were systematically investigated. The current results demonstrate that the separating force between the PGE and SR components was reduced significantly on increasing the content of SR, and in particular the PGE/SR1 membrane (100:25) exhibited a well‐defined asymmetric bilayer structure with high porosity, appropriate toughness, water uptake, swelling ratio and water permeability. Concomitantly, the maximum weight loss for the PGE/SR1 membrane was ca 70.65% after 9 days of enzymatic degradation, which met the typical healing period of a normal skin wound. In addition, both the original and degraded PGE/SR1 membrane possessed favorable cytocompatibility in vitro, suggesting its potential application as a wound dressing. © 2019 Society of Chemical Industry

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“…Because the disparate functions of shell and core usually lead to incompatibilities between the two, additional adaptive layers are introduced to enhance their union. These are increasingly referred to as self-stratifying coatings 1 and, once again, were evolved by biology, e.g., plant cutins, long before becoming a design concept in engineered materials. Some, but by no means all, biological coatings may thus provide valuable insights for stimulating improvements in manufactured coatings.…”

Section: Introductionmentioning

confidence: 99%

The Thiol-Rich Interlayer in the Shell/Core Architecture of Mussel Byssal Threads

Valois

Hoffman²,

DeMartini

et al. 2019

Langmuir

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The mussel byssus thread is an extremely tough core-shelled fiber that dissipates substantial amounts of energy during tensile loading. The mechanical performance of the shell is critically reliant on 3,4-dihydroxyphenylalanine's (Dopa) ability to form reversible iron-catecholate complexes at pH 8. However, the formation of these coordinate cross-links is undercut by Dopa's oxidation to Dopa-quinone, a spontaneous process at seawater conditions. The large mechanical mismatch between the cuticle and the core lends itself to further complications. Despite these challenges, the mussel byssus thread performs its tethering function over long periods of time. Here, we address these two major questions: (1) how does the mussel slow/prevent oxidation in the cuticle, and (2) how is the mechanical mismatch at the core/ shell interface mitigated? By combining a number of microscopy and spectroscopy techniques we have discerned a previously undescribed layer. Our results indicate this interlayer is thiol rich and thus will be called the thiol-rich interlayer (TRL). We propose the TRL serves as a long-lasting redox reservoir as well as a mechanical barrier.

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Self-stratifying coatings: A review

Cited by 60 publications

References 32 publications

Intertidal exposure favors the soft-studded armor of adaptive mussel coatings

Intertidal exposure favors the soft-studded armor of adaptive mussel coatings

Influence of the weight ratio of polydimethylsiloxane modified gelatin to silicone rubber on the potential performance of asymmetric bilayer membranes as wound dressings

The Thiol-Rich Interlayer in the Shell/Core Architecture of Mussel Byssal Threads

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