Flexible Plasma Polymer Coatings for Crack Resistance
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Solution Overview
Problem
Existing plasma polymer coatings have low elasticity and flexibility, leading to undesirable cracks under mechanical loading, which adversely affect their mechanical properties and performance, and they are not suitable for applications requiring flexibility and non-stick characteristics.
Innovation Solution
A plasma polymer product comprising carbon, silicon, oxygen, and hydrogen with specific bond energy shifts in the ESCA spectrum, characterized by a high proportion of cross-linked silicon atoms with two oxygen atoms and a low proportion of three-dimensional cross-linking, resulting in increased elasticity and flexibility, and a coating structure that can be removed from a substrate without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional plasma polymer coatings are used to provide non-stick and dirt-repellent characteristics, then the coating achieves the desired surface properties, but the coating has low elasticity and flexibility, leading to cracks under mechanical loading
Solution Approach 1:
The invention changes the chemical composition parameters of the plasma polymer coating by controlling the precursor mixture (silane and vinylsilane compounds) and plasma processing conditions. This results in a coating with a specific cross-linking density that provides both non-stick performance and enhanced elasticity, preventing cracks under mechanical loading while maintaining the desired surface properties
Solution Approach 2:
The invention creates a composite plasma polymer coating by combining different silicon-containing precursors (silane and vinylsilane compounds) in specific ratios. This composite approach allows the coating to exhibit both the non-stick characteristics of traditional plasma polymers and the flexibility of a more elastic network structure, resolving the contradiction between performance and mechanical strength
2Strength
If the plasma polymer coating is made more flexible to prevent cracks, then the elasticity improves, but the coating may form oligomer products with viscous character that compromise adhesion and fitness for purpose
Solution Approach 1:
The invention precisely controls the plasma processing parameters including power density, pressure, and gas flow rates to achieve optimal cross-linking. By adjusting these parameters, the coating achieves sufficient elasticity without excessive oligomer formation, maintaining both adhesion and the desired flexible properties
Solution Approach 2:
The invention creates a coating with non-uniform cross-linking density, where the network structure is optimized to provide elasticity in bulk while maintaining adhesion at the substrate interface. This local differentiation allows the coating to be flexible where needed while maintaining strong bonding to the substrate
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The plasma polymer product exhibits enhanced elasticity, flexibility, and non-stick characteristics, preventing crack formation and maintaining performance under mechanical stress, while also serving as a barrier to molecular migration and improving sliding ability compared to conventional coatings.
Implementation Method 1
Plasma polymerisation is a method by which gaseous precursors (frequently also referred to as monomers), excited by a plasma, condense onto a freely selectable substrate as a highly cross-linked coating
Implementation Method 2
through bombardment with electrons and/or energy-rich ions, are fragmented
Implementation Method 3
through bombardment with electrons and/or energy-rich ions, are fragmented
Implementation Method 4
The electrical discharge of the plasma and its intensive ion and electron bombardment acts constantly upon this deposited coating, so that in the deposited coating further reactions are triggered and a high degree of cross-linkage of the deposited molecules can be achieved
Data Source
AI summary
The present invention concerns items that contain or consist of a plasma polymer product, consisting of carbon, silicon, oxygen and hydrogen, wherein the ESCA spectrum of the plasma polymer product, with calibration to the aliphatic portion of the C 1s peak at 285.00 eV, in comparison with a trimethylsiloxy-terminated polydimethylsiloxane (PDMS) with a kinematic viscosity of 350 mm2/s at 25° C. and a density of 0.97 g/ml at 25° C.,the Si 2p peak has a bond energy that is shifted by 0.44 eV, at most, to higher or lower bond energies, and the O 1s peak has a bond energy that is shifted by 0.50 eV, at most, to higher or lower bond energies.