Humidity-responsive Bilayer Actuators Comprised of Porous and Nonporous Poly(acrylic acid)/Poly(aIlylamine hydrochloride)Films-中国Betway体育网页登陆

摘要 Bilayerhumidity-responsiveactuatorsaregenerallycomposedofactuatingandsupportinglayersofdifferentmaterialswithlargelydifferentwettability.Suchkindsofbilayeractuatorssufferfromlowadhesiveforcebetweenthetwolayersduringusage.Thisstudydemonstratesthepreparationofhumidity-responsivebilayeractuatorsthathavethesamematerialsintheactuatingandsupportinglayerstoavoidtheadhesiveissue.Thebilayeractuatorsconsistofaporouspoly(acrylicacid)σAA)/poly(allylaminehydrochloride)(PAH)layerandanonporousPAA/PAHlayerthatarefabricatedbyexponentiallylayer-by-layerassemblymethod.Atahigh/lowrelativehumidity(RH),thenonporousPAAIPAHlayercanefficientlyexpand/shrinkbyabsorbing/desorbingwaterwhilethevolumeexpansion/shrinkageoftheporousPAA/PAHlayerinanenvironmentwithchangedhumidityissignificantlysuppressedbythemicrometer-sizedpores.Thelargelydifferentexpansion/shrinkageofthenonporousandporousPAA/PAHlayerswhensubjectedtohumiditychangesenablesrapidandreversiblerolling/unrollingmotionsofthebilayeractuator.Thebilayeractuatorshowsafasterrollingspeedandalargerbendingcurvaturewhensubjectedtoalargerhumidityincrease.

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Humidity-responsive Bilayer Actuators Comprised of Porous and Nonporous Poly(acrylic acid)/Poly(aIlylamine hydrochloride)Films

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