Abstract Thin films of crosslinked polymethylhydrosiloxane (PMHS) are grafted on silica using sol-gel process allowing subsequent coupling of molecules by hydrosilylation grafting to Si–H groups. The aim was to fabricate stable polysiloxane film on solid supports with well-characterized functionalities and surface properties for various applications. The pristine PMHS surface was modified with phosphorylcholine group by reaction at room temperature or 40 °C catalyzed by Karstedt's catalyst with a phospholipid molecule containing linoleoyl chains to form hydrophilic surfaces as a model. The purpose was to characterize precisely the structure and composition of virgin and treated PMHS films in relation with the wetting properties by using IR and X-ray photoelectron spectroscopies (XPS). The surface properties were studied by pure water contact angle measurements in air by using sessile drops and captive bubbles, atomic force microscopy, and scanning electron microscopy. The modified surfaces are highly hydrophilic with a contact angle varying from 40 to 0°. Analysis of the composition of the surface showed that the reaction of linoleoyl chains gives the 2:1 (Si:phospholipid) hydrosilylation adducts resultant from one fold addition of methylhydrosilane on each linoleoyl chain. The graft yield in terms of molecular percentage determined by XPS in various conditions was correlated in good agreement with wetting properties and previous protein adsorption measurements for comparison purpose.

中文翻译：

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附着在硅载体上并用磷酸胆碱基团改性的聚甲基氢硅氧烷薄膜的可控结构和亲水性能

摘要 交联聚甲基氢硅氧烷 (PMHS) 薄膜使用溶胶-凝胶工艺接枝在二氧化硅上，允许随后通过氢化硅烷化接枝到 Si-H 基团来偶联分子。目的是在固体载体上制造稳定的聚硅氧烷薄膜，具有良好表征的功能和表面特性，适用于各种应用。通过在室温或 40 °C 下由 Karstedt 催化剂与含有亚油酰基链的磷脂分子反应，用磷酰胆碱基团修饰原始 PMHS 表面，形成亲水表面作为模型。目的是通过使用 IR 和 X 射线光电子能谱 (XPS) 精确表征原始和处理过的 PMHS 薄膜的结构和组成与润湿性能的关系。通过使用固着滴和俘获气泡、原子力显微镜和扫描电子显微镜在空气中测量纯水接触角来研究表面性质。改性表面具有高度亲水性，接触角从 40° 到 0° 不等。表面组成的分析表明，亚油酰基链的反应产生了 2:1 (Si: 磷脂) 氢化硅烷化加合物，这是由在每个亚油酰基链上加成一倍的甲基氢硅烷产生的。在各种条件下由 XPS 确定的分子百分比接枝率与润湿特性和先前的蛋白质吸附测量非常一致，以进行比较。改性表面具有高度亲水性，接触角从 40° 到 0° 不等。表面组成的分析表明，亚油酰基链的反应产生了 2:1 (Si: 磷脂) 氢化硅烷化加合物，这是由在每个亚油酰基链上加成一倍的甲基氢硅烷产生的。在各种条件下由 XPS 确定的分子百分比接枝率与润湿特性和先前的蛋白质吸附测量非常一致，以进行比较。改性表面具有高度亲水性，接触角从 40° 到 0° 不等。表面组成的分析表明，亚油酰基链的反应产生了 2:1 (Si: 磷脂) 氢化硅烷化加合物，这是由在每个亚油酰基链上加成一倍的甲基氢硅烷产生的。在各种条件下由 XPS 确定的以分子百分比计的接枝率与润湿特性和先前的蛋白质吸附测量非常吻合，以进行比较。