Amide Polymer PECVD Coating Adhesion Weathering
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Solution Overview
Problem
Plasma-enhanced chemical vapor deposition (PECVD) coatings demonstrate poor adhesion to polycarbonate sheeting after exposure to adverse weather conditions, limiting their effectiveness for abrasion resistance and water wettability.
Innovation Solution
A PECVD coating process is developed using a polymer substrate with a polymer unit comprising an amide group, such as polyamides or polyurethanes, and a polyorganosiloxane coating with specific chemical composition and thickness, ensuring adhesion greater than 4.0 according to ASTM tests after exposure to water and UV radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PECVD coating is applied to polycarbonate sheeting to increase abrasion resistance, then abrasion resistance is improved, but adhesion to the substrate deteriorates after exposure to adverse weather conditions
Solution Approach 1:
The patent changes the chemical composition parameters of the polymer substrate by selecting polymers containing amide groups (polyamides, polyurethanes, polyureas, etc.) instead of conventional polycarbonate. This compositional parameter change enables the coating to maintain adhesion greater than or equal to 4.0 after weathering exposure, while preserving abrasion resistance properties
Solution Approach 2:
The patent creates a composite structure consisting of a polymer substrate containing amide groups combined with a PECVD coating layer. This composite material system achieves synergistic effects where the amide-containing polymer provides both abrasion resistance and weathering-resistant adhesion, overcoming the limitations of single-material solutions
2Duration of action of stationary object
If PECVD coating thickness is increased to improve durability, then coating durability is improved, but adhesion after weathering exposure deteriorates
Solution Approach 1:
The patent changes the chemical composition parameter of the substrate polymer to include amide groups, which fundamentally alters the coating-substrate interaction. This enables the system to maintain adhesion greater than or equal to 4.0 after 200 hours of UV exposure and two days of water immersion, regardless of coating thickness, eliminating the trade-off between durability and adhesion
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 coating maintains high adhesion and performance even after prolonged immersion in water and UV exposure, enhancing the durability and functionality of polymer objects.
Implementation Method 1
plasma enhanced chemical vapor deposition (PECVD) techniques to coat an object with, for example, a silicon oxide layer and/or a polyorganosiloxane layer
Data Source
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AI summary
A coated object, wherein at least a portion of the surface of the object is an amide containing polymer wherein at least a portion of a surface of the amide containing polymer has a plasma enhanced chemical vapor deposition exposed coating thereon. A method for making a coated object, wherein at least a portion of the surface of the object comprises an amide containing polymer, by the step of coating at least a portion of a surface of the polymer containing an amide group by a plasma enhanced chemical vapor deposition coating process to form a plasma enhanced chemical vapor deposition exposed coating thereon.