Moisture-permeable polyurethanepressure-sensitive adhesive addresses needs of wearable devices / Makito Nakamura in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 27, N° 5 (05/2020)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 27, N° 5 (05/2020) . - p. 24-27 Titre : Moisture-permeable polyurethanepressure-sensitive adhesive addresses needs of wearable devices Type de document : texte imprimé Auteurs : Makito Nakamura, Auteur ; Haru Kawasaki, Auteur ; Hitoshi Shimona, Auteur ; Chitoshi Suzuki, Auteur Année de publication : 2020 Article en page(s) : p. 24-27 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs à usages médicaux Adhésifs dans les équipements électriques/électroniques Adhésifs sensibles à la pression Adhésion Dents -- Soins et hygiène Humidité Médecine -- Appareils et matériel Perméabilité Polyacryliques Polymères en médecine Polyuréthanes Prothèses dentaires Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Index. décimale : 668.3 Adhésifs et produits semblables Résumé : It is difficult to simultaneously achieve both moderate adhesion to the skin and strong adhesion to a wearable device, but a new polyurethane pressure-sensitive adhesive is providing a solution. Wearable devices are used in medicine to continuously monitor signals such as electrocardiograms and electroencephalograms. They can also be used to monitor physical conditions during exercise. To improve the accuracy of the analysis, many studies have been conducted by directly attaching wearable devices to the skin using a pressure-sensitive adhesive (PSA) sheet. When a PSA sheet is continuously applied for an extended time, however, the user's skin becomes macerated due to the moisture generated from their skin. This increases the amount of peeled stratum corneum (outer layer of the skin). PSAs used in this application must meet several requirements, including: patient/user safety, appropriate adhesiveness to the skin, reduction of the humidity that results from sweat after application, and strong adhesion to the wearable device. In response to all of these demands, studies have been conducted using a silicone PSA and an acrylic PSA for wearable devices. The acrylic PSA was found to have insufficient moisture permeability, and there are problems with sweating that may occur if it is applied for a long time. On the other hand, the silicone PSA can reduce the humidity from sweat due to its moisture permeability caused by its high free volume. It is difficult to simultaneously achieve both moderate adhesion to the skin and strong adhesion to the wearable device. Note de contenu : - Harnessing the power of polyurethane - Moisture permeability - Amount of peeled stratum corneum - Adhesive strength to various adherends - Safety study - Achieving safety and effectiveness - Fig. 1 : Moisture vapor transmission rate (MVTR) of PSA sheets measured by dry and wet methods - Fig. 2 : Amount of peeled stratum corneum for each PSA - Fig. 3 : Appearance of peeled PSA sheets after exercise - Fig. 4 : Adhesive strength of PSAs to skin and various plastics - Table 1 : Appearance of the skin after a patch tests En ligne : https://www.adhesivesmag.com/articles/97751-moisture-permeable-polyurethane-pres [...] Format de la ressource électronique : https://www.adhesivesmag.com/articles/97751-moisture-permeable-polyurethane-pressure-sensitive-adhesive-addresses-needs-of-wearable-devices Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34259 [article]

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