作者:Hsien-Yeh Chen、Arthur A. McClelland、Zhan Chen、Joerg Lahann
DOI:10.1021/ac800341m
日期:2008.6.1
A novel solventless adhesive bonding (SAB) process is reported, which is applicable to a wide range of materials including, but not limited to, poly(dimethylsiloxane) (PDMS). The bonding is achieved through reactions between two complementary polymer coatings, poly(4-aminomethyl-p-xylylene-co-p-xylylene) and poly(4-formyl-p-xylylene-co-p-xylylene), which are prepared by chemical vapor deposition (CVD) polymerization of the corresponding [2.2]paracyclophanes and can be deposited on complementary microfluidic units to be bonded. These CVD-based polymer films form well-adherent coatings on a range of different substrate materials including polymers, glass, silicon, metals, or paper and can be stored for extended periods prior to bonding without losing their bonding capability. Tensile stress data are measured on PDMS with various substrates and compared favorably to current methods such as oxygen plasma and UV/ozone. Sum frequency generation (SFG) has been used to probe the presence of amine and aldehyde groups on the surface after CVD polymerization and their conversion during bonding. In addition to bonding, unreacted functional groups present on the luminal surface of microfluidic channels provide free chemical groups for further surface modification. Fluorescently labeled molecules including rhodamine-conjugated streptavidin and atto-655 NHS ester were used to verify the presence of active functional groups on the luminal surfaces after bonding.
据报道,一种新型无溶剂粘合剂粘合(SAB)工艺适用于多种材料,包括但不限于聚(二甲基硅氧烷)(PDMS)。粘合是通过两种互补聚合物涂层(聚(4-氨甲基对二甲苯共对二甲苯)和聚(4-甲酰基对二甲苯共对二甲苯))之间的反应实现的,这两种涂层是通过相应的[2.2]对二甲苯的化学气相沉积(CVD)聚合制备的,可沉积在待粘合的互补微流体单元上。这些基于 CVD 的聚合物薄膜可在一系列不同的基底材料(包括聚合物、玻璃、硅、金属或纸张)上形成附着力良好的涂层,并且在粘合前可长期保存而不会失去粘合能力。测量了 PDMS 与各种基材之间的拉伸应力数据,并与氧等离子体和紫外线/臭氧等现有方法进行了比较。和频发生(SFG)被用来探测 CVD 聚合后表面是否存在胺和醛基团,以及它们在粘合过程中的转化情况。除了键合,存在于微流控通道管腔表面的未反应官能团也为进一步的表面改性提供了自由化学基团。荧光标记分子包括罗丹明结合的链霉亲和素和阿托-655 NHS 酯,用于验证键合后管腔表面是否存在活性官能团。