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Rapid and controlled photo-induced thiol–ene wrinkle formation via flowcoating†
Materials Horizons ( IF 12.2 ) Pub Date : 2018-03-14 00:00:00 , DOI: 10.1039/c8mh00118a Stephen J. Ma 1, 2, 3, 4 , Norman J. Wagner 1, 2, 3, 4, 5 , Christopher J. Kloxin 1, 2, 3, 4, 5
Materials Horizons ( IF 12.2 ) Pub Date : 2018-03-14 00:00:00 , DOI: 10.1039/c8mh00118a Stephen J. Ma 1, 2, 3, 4 , Norman J. Wagner 1, 2, 3, 4, 5 , Christopher J. Kloxin 1, 2, 3, 4, 5
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Spatially controlled wrinkle formation on an elastomeric substrate is achieved through flowcoating of a nanometer thick, high modulus thiol–ene film laminated on a millimeter-thick thiol–ene elastomer. The elastomer substrate is formed via photopolymerization of thiol and ene monomers with a slight stoichiometric excess of thiol to yield a 2.3 MPa elastomer. Separately, thiol and ene monomers, with a higher degree of functionality, are flow coated onto a glass slide and photopolymerized under ambient conditions to yield a 1.9 GPa film tens of nanometers thick. The photocrosslinked thin film is transferred onto the strained elastomer to spontaneously produce wrinkles upon strain release. Careful selection of thiol and ene monomers facilitate tuning of the film and elastomer mechanical properties, while stoichiometry control (i.e., excess thiols in the elastomer and excess enes in the film) allows covalent attachment of the film to the elastomer to prevent delamination upon elastomer destrain. Photopatterning of a flowcoated thin film is demonstrated, which, when wrinkled, generates a very distinct pattern of aligned wrinkle structures with clearly defined boundaries. Finally, by coating and photopatterning in sequence, spatial wrinkle wavelength control is readily attained by defining the film thickness at any given point.
中文翻译：
通过流涂法 快速而受控地形成光诱导的硫醇-烯皱纹†
通过在纳米厚度的硫醇-烯弹性体上层压纳米厚的高模量硫醇-烯膜进行流涂，可以在弹性体基材上形成空间可控的皱纹。弹性体基材通过硫醇和烯类单体的光聚合反应，在化学计量上略微过量的硫醇产生2.3 MPa的弹性体。分别将具有较高官能度的硫醇和烯类单体流涂到载玻片上，并在环境条件下进行光聚合，以产生几十纳米厚的1.9 GPa膜。将光致交联的薄膜转移到应变的弹性体上，以在应变释放时自发地产生皱纹。仔细选择硫醇和烯类单体有助于调节薄膜和弹性体的机械性能，同时控制化学计量（即（弹性体中过量的硫醇和膜中过量的烯），使膜与弹性体共价连接，以防止弹性体受约束时发生分层。演示了流涂薄膜的光图案化，该薄膜在起皱时会产生清晰的边界清晰的对齐皱纹结构图案。最后，通过依次进行涂布和光图案化，通过在任何给定点定义膜厚，可以轻松实现空间皱纹波长控制。
更新日期：2018-03-14
中文翻译：
通过流涂法 快速而受控地形成光诱导的硫醇-烯皱纹†
通过在纳米厚度的硫醇-烯弹性体上层压纳米厚的高模量硫醇-烯膜进行流涂，可以在弹性体基材上形成空间可控的皱纹。弹性体基材通过硫醇和烯类单体的光聚合反应，在化学计量上略微过量的硫醇产生2.3 MPa的弹性体。分别将具有较高官能度的硫醇和烯类单体流涂到载玻片上，并在环境条件下进行光聚合，以产生几十纳米厚的1.9 GPa膜。将光致交联的薄膜转移到应变的弹性体上，以在应变释放时自发地产生皱纹。仔细选择硫醇和烯类单体有助于调节薄膜和弹性体的机械性能，同时控制化学计量（即（弹性体中过量的硫醇和膜中过量的烯），使膜与弹性体共价连接，以防止弹性体受约束时发生分层。演示了流涂薄膜的光图案化，该薄膜在起皱时会产生清晰的边界清晰的对齐皱纹结构图案。最后，通过依次进行涂布和光图案化，通过在任何给定点定义膜厚，可以轻松实现空间皱纹波长控制。
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