Polyamide Composition for Acid-Resistant Anodized Device Components
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Solution Overview
Problem
Existing polyamide compositions used in mobile electronic devices are sensitive to acid-catalyzed hydrolysis, limiting their use in applications requiring anodization, and there is a need for improved mechanical and acid resistance in plastic-metal hybrid designs for complex geometries.
Innovation Solution
A polymer composition comprising functionalized polyolefin, polyphthalamide with a carbon-to-amide molar ratio greater than 8, and glass fiber, with specific weight ratios, is used to enhance mechanical properties and acid resistance, allowing direct anodization without masking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyolefin is used as the base material for mobile device components, then chemical resistance and durability are improved, but bonding strength to other materials deteriorates
Solution Approach 1:
The patent applies composite materials by combining polyolefin base material with functionalized polyolefin graft copolymer. The functionalized polyolefin contains polar groups that enhance bonding strength while the polyolefin base maintains chemical resistance, creating a composite material that resolves the contradiction between chemical resistance and bonding strength.
Solution Approach 2:
The patent applies local quality by introducing functional groups at specific locations on the polyolefin chains through grafting. The functionalized polyolefin graft copolymer contains polar groups localized at the graft sites, providing enhanced bonding capability at interfaces while the bulk polyolefin maintains its chemical resistance properties.
2Reliability
If conventional polyolefin is used, then chemical resistance is improved, but adhesion to metals, ceramics, and polymers deteriorates
Solution Approach 1:
The patent uses composite materials by creating a blend of polyolefin and functionalized polyolefin graft copolymer. The functionalized component provides polar groups that enhance adhesion to metals, ceramics, and polymers, while the polyolefin matrix maintains chemical resistance, resolving the contradiction between adhesion and chemical resistance.
Solution Approach 2:
The patent applies parameter changes by modifying the chemical structure of polyolefin through grafting with functional groups. This changes the surface polarity and chemical composition parameters of the material, enabling improved adhesion to various substrates while maintaining the bulk chemical resistance properties of the polyolefin base material.
3Reliability
If polyolefin is used for electronic device components, then chemical inertness and durability are improved, but surface energy and bonding capability deteriorate
Solution Approach 1:
The patent applies composite materials by combining polyolefin with functionalized polyolefin graft copolymer. The functionalized component increases surface energy through polar groups, improving bonding capability for assembling electronic components, while the polyolefin base maintains durability and chemical inertness.
Solution Approach 2:
The patent applies local quality by introducing functional groups locally on the polyolefin chains through grafting. This creates regions of high polarity and surface energy at the graft sites, enhancing bonding capability at interfaces, while the bulk material maintains its durability and chemical inertness.
Data Source
Figure 1~2
AI summary
Described herein are polymer compositions including a polyphthalamide having a carbon/amide molar ratio greater than 8, a functionalized polyolefin, and a glass fiber, where the weight ratio of the functionalized polyolefin to the total weight of the polyphthalamide and the functionalized polyolefin in the polymer composition is more than 0 and at most 27%. It was surprisingly discovered that the polymer compositions had excellent dielectric performance, acid resistance, and improved mechanical performance, particularly tensile elongation and unnotched Izod impact, relative to corresponding polymer compositions omitting such functionalized polyolefin. Due to the excellent performance, the polymer composition can be desirably incorporated into mobile electronic device components.