Synthesis and Characterization of a Tertiary Amine Polymer Series from Surface-Grafted Poly(tert-butyl acrylate) via Diamine Reactions

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• 作者：Keisha B. Walters ; Douglas E. Hirt
• 刊名：Macromolecules
• 出版年：2007
• 出版时间：July 10, 2007
• 年：2007
• 卷：40
• 期：14
• 页码：4829 - 4838
• 全文大小：200K
• 年卷期：v.40,no.14(July 10, 2007)
• ISSN：1520-5835

文摘

A sequence of reaction steps was used to graft poly(tert-butyl acrylate) (PtBA) to silicon (Si)wafers and to modify the pendant groups of the tethered PtBA to create chemically tailored surface modifyinglayers. The Si wafers were first prepared for grafting by the deposition of a self-assembled monolayer (SAM) ofN-aminopropyldimethylethoxysilane. The terminal primary amine groups on the SAM provided sites for reactionwith carboxy-terminated PtBA. The choice of PtBA as the tethered polymer was due to the ability to substitutethe tert-butyl ester groups with other functionalities. In this study, the tert-butyl esters were replaced with variousdiamines to create a series of polymers with tertiary amine pendant groups. The reactions and surface propertieswere monitored with external reflectance (ER) and transmission FTIR spectroscopies, ellipsometry, X-rayphotoelectron spectroscopy (XPS), and static water contact angle goniometry. Hydrolysis and novel diamineconversion reactions were successfully performed on both neat PtBA homopolymer and end-grafted PtBA (Si-g-PtBA). Changes in static water contact angle confirmed the deposition of the N-aminopropyldimethylethoxysilaneSAM and grafting of the end-functionalized PtBA. Reactions of the surface-grafted PtBA with ethylenediamineand dimethylethylenediamine showed the highest conversion yields.