Abstract
An erasable coating was prepared to modify material surfaces with accessibilities, including specific conjugation, elimination of the conjugated chemistry/function, and the reactivation of a second new chemistry/function. The coating was realized based on a vapor-deposited functional poly-p-xylylene coating composed of an integrated 3-((3-methylamido)-disulfanyl)propanoic acid functional group, resulting in not only chemical reactivity, but also a disulfide interchange mechanism. Mechanically, the coating was robust in terms of the thermal stability and adhesive property on a variety of substrate materials. Chemically, the anchoring site of carboxylic acid was accessible for specific conjugation, and a disulfide bridge moiety was used to disengage already installed functions/properties. In addition, the homogeneous nature of the vapor-phased coating technique is known for its morphology/thickness and distribution of the functional moiety, which allowed precision to address the installation or erasure of functions and properties. Characterization of the precisely confined hydrophilic/hydrophobic wetting property and the alternating reversibility of this wetting property on the same surface was achieved.
Highlights
Coating technologies are widely adopted as robust surface modification tools for application on substrate materials to achieve new surface properties
Preparation of the coating was realized by using a chemical vapor deposition (CVD) polymerization process from the 3-((3-methylamido)-disulfanyl)propanoic acid-substituted [2.2]paracyclophane starting material, whose synthesis details are included in the Materials and Methods
Advanced control over the interfacial properties, including the specific conjugation accessibility, a homogeneous and high molecular resolution to enable precise geographical control, a capability to eliminate existing properties, and a timed flexibility for manipulating the properties, were realized by using the erasable coating introduced in this study
Summary
Coating technologies are widely adopted as robust surface modification tools for application on substrate materials to achieve new surface properties. Vapor-phase initiators have been deposited on substrates to induce protein adsorption and external stimuli [6,7], among others. Such modification technologies have continued to develop with advanced capabilities, Polymers 2019, 11, 1595; doi:10.3390/polym11101595 www.mdpi.com/journal/polymers. We introduce a reactive coating of disulfanyl propanoic acid-functionalized poly-p-xylylene (hereafter referred to as an erasable coating), which was prepared based on vapor-phase deposition and a polymerization process. The erasable coating includes a backbone structure of poly-p-xylylene, which is analogous to the commercial
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