As a common electronic adhesive,ultraviolet(UV)curing polyurethane acrylate adhesive has both flexibility and wear resistance of polyurethane,excellent weather resistance and optical properties of acrylate.Despite the...As a common electronic adhesive,ultraviolet(UV)curing polyurethane acrylate adhesive has both flexibility and wear resistance of polyurethane,excellent weather resistance and optical properties of acrylate.Despite the extensive applications,it is still difficult to solve the problems caused by the shrinkage of adhesive.Here,a new type of photosensitive adhesive for bonding electronic components based on supramolecular interaction was designed and synthesized.The supramolecular interaction of cyclodextrin and adamantane moieties introduced into the adhesive polymer entitles the viscosity of the adhesive to rise rapidly during use,thereby preventing adhesive loss and dislocation of electronic components.UV light could further cure the adhesive and position the electronic components.The adhesive shrunk<2%when cured by UV light,so it can be used for electronic packaging and high-resolution,defect-free lithography.展开更多
Reuse/recycling of expensive components in next-generation optoelectronic systems(e.g.,flexible electronics and foldable displays)for sustainability purposes impose stringent requirements on optically clear adhesive(O...Reuse/recycling of expensive components in next-generation optoelectronic systems(e.g.,flexible electronics and foldable displays)for sustainability purposes impose stringent requirements on optically clear adhesive(OCA)with on-demand adhesion/deadhesion capability.Although some hot-melt OCAs have been developed,there still remain great challenges in balancing the mechanical property,adhesion/detachment and recyclability/reusability of the OCAs.Herein,we developed a debondable and robust polyurethane(PU)-based optically clear adhesive with both mechanical and chemical recyclability,overcoming the critical bottlenecks in sustainable advanced manufacturing.The ductile yet strong PU-based OCAs not only can adhere to various optically transparent glass and polymeric substrates(with a bonding strength high up to 5.0 MPa),but also exhibit deadhesion capability at high temperature owing to the thermally sensitive H-bonding interaction within the polymer network.The ondemand adhesion/deadhesion facilitates non-destructive detachment of functional assemblies and materials recycling/repair.The mechanical and chemical recyclability of PU-based OCAs can also effectively reduce the cost and address the endof-life issues.Moreover,the PU-based OCAs outperformed some commercial optical adhesives.In view of the straightforward synthesis,easy industrial scale-up and exceptional comprehensive properties,the PU-based OCAs will provide promising transformative solutions for advancing the circular economy and sustainability in next-generation optoelectronic devices.展开更多
Silicone-based pressure-sensitive adhesives(Si-PSAs)are valued for their thermal stability,flexibility,and biocompatibility,but their weak bonding strength restricts high-performance use.Polyurethane-modified Si-PSAs ...Silicone-based pressure-sensitive adhesives(Si-PSAs)are valued for their thermal stability,flexibility,and biocompatibility,but their weak bonding strength restricts high-performance use.Polyurethane-modified Si-PSAs enhance adhesion,however diisocyanates remain essential.The raw materials of isocyanates are toxic,and their synthesis involves phosgene.To make up for those shortcomings,a series of poly(hydroxy urethane-siloxane)PSAs,named as PHUSi here,were synthesized through the ring-opening reaction of cyclic carbonate-functionalized polysiloxanes(PSi_(x)-VEC_(z))with various aliphatic diamines.The PSi_(x)-VEC_(z) precursors were prepared via the hydrosilylation of hydrogen-containing polysiloxanes(PSi_(x)-H_(y))with 4-vinyl-1,3-dioxolan-2-one(VEC).The chemical structures of PSi_(x)-H_(y),PSi_(x)-VEC_(z) and PHUSi were characterized,and bonding properties of PHUSi were systematically evaluated.The influence of architectures on adhesive performance was elucidated through comprehensive analyses,including rheology,crosslink density assessment,and so on.These studies revealed that the tailored design of PHUSi adhesives combine the advantages of traditional Si-PSAs with enhanced adhesion while eliminating isocyanate toxicity.The optimized PHUSi formulation achieved remarkable 180°peel strength(76.5 N/m on skin)and maximum probe tack force(1.61 N),enabling secure 24 h attachment of flexible sensors to skin.These properties make PHUSi particularly suitable for medical applications,as demonstrated by successful implementation in flexible electrocardiogram devices,offering a biocompatible,high-performance adhesive.展开更多
基金support from the National Natural Science Foundation of China(No.22308279)Guangdong Basic and Applied Basic Research Foundation(No.2021A1515110695)Natural Science Foundation of Chongqing(No.2023NSCQMSX2773).
文摘As a common electronic adhesive,ultraviolet(UV)curing polyurethane acrylate adhesive has both flexibility and wear resistance of polyurethane,excellent weather resistance and optical properties of acrylate.Despite the extensive applications,it is still difficult to solve the problems caused by the shrinkage of adhesive.Here,a new type of photosensitive adhesive for bonding electronic components based on supramolecular interaction was designed and synthesized.The supramolecular interaction of cyclodextrin and adamantane moieties introduced into the adhesive polymer entitles the viscosity of the adhesive to rise rapidly during use,thereby preventing adhesive loss and dislocation of electronic components.UV light could further cure the adhesive and position the electronic components.The adhesive shrunk<2%when cured by UV light,so it can be used for electronic packaging and high-resolution,defect-free lithography.
基金supported by the National Natural Science Foundation of China(52222302)。
文摘Reuse/recycling of expensive components in next-generation optoelectronic systems(e.g.,flexible electronics and foldable displays)for sustainability purposes impose stringent requirements on optically clear adhesive(OCA)with on-demand adhesion/deadhesion capability.Although some hot-melt OCAs have been developed,there still remain great challenges in balancing the mechanical property,adhesion/detachment and recyclability/reusability of the OCAs.Herein,we developed a debondable and robust polyurethane(PU)-based optically clear adhesive with both mechanical and chemical recyclability,overcoming the critical bottlenecks in sustainable advanced manufacturing.The ductile yet strong PU-based OCAs not only can adhere to various optically transparent glass and polymeric substrates(with a bonding strength high up to 5.0 MPa),but also exhibit deadhesion capability at high temperature owing to the thermally sensitive H-bonding interaction within the polymer network.The ondemand adhesion/deadhesion facilitates non-destructive detachment of functional assemblies and materials recycling/repair.The mechanical and chemical recyclability of PU-based OCAs can also effectively reduce the cost and address the endof-life issues.Moreover,the PU-based OCAs outperformed some commercial optical adhesives.In view of the straightforward synthesis,easy industrial scale-up and exceptional comprehensive properties,the PU-based OCAs will provide promising transformative solutions for advancing the circular economy and sustainability in next-generation optoelectronic devices.
基金financially supported by the Shandong Provincial Natural Science Foundation,China(Nos.ZR2022MB051 and ZR2021MB112)Postdoctoral Science Foundation of China(No.2022M712343)+2 种基金Jinan City University Integration Development Strategy Project(No.JNSX2024030)Key Laboratory of Special Functional Aggregates of the Ministry of Education,Shandong University(No.JJT-2023-02)Shandong SD-Link New Material Technology Co.,LTD.
文摘Silicone-based pressure-sensitive adhesives(Si-PSAs)are valued for their thermal stability,flexibility,and biocompatibility,but their weak bonding strength restricts high-performance use.Polyurethane-modified Si-PSAs enhance adhesion,however diisocyanates remain essential.The raw materials of isocyanates are toxic,and their synthesis involves phosgene.To make up for those shortcomings,a series of poly(hydroxy urethane-siloxane)PSAs,named as PHUSi here,were synthesized through the ring-opening reaction of cyclic carbonate-functionalized polysiloxanes(PSi_(x)-VEC_(z))with various aliphatic diamines.The PSi_(x)-VEC_(z) precursors were prepared via the hydrosilylation of hydrogen-containing polysiloxanes(PSi_(x)-H_(y))with 4-vinyl-1,3-dioxolan-2-one(VEC).The chemical structures of PSi_(x)-H_(y),PSi_(x)-VEC_(z) and PHUSi were characterized,and bonding properties of PHUSi were systematically evaluated.The influence of architectures on adhesive performance was elucidated through comprehensive analyses,including rheology,crosslink density assessment,and so on.These studies revealed that the tailored design of PHUSi adhesives combine the advantages of traditional Si-PSAs with enhanced adhesion while eliminating isocyanate toxicity.The optimized PHUSi formulation achieved remarkable 180°peel strength(76.5 N/m on skin)and maximum probe tack force(1.61 N),enabling secure 24 h attachment of flexible sensors to skin.These properties make PHUSi particularly suitable for medical applications,as demonstrated by successful implementation in flexible electrocardiogram devices,offering a biocompatible,high-performance adhesive.
