Hyperbranched POSS Polymers for Space Adhesive Radiation Resistance
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Solution Overview
Problem
Current space solar cell adhesives, such as Dow Corning 93-500, suffer from UV-induced darkening, poor proton resistance, and inadequate atomic oxygen resistance, while POSS-modified materials exhibit improved resistance but with limitations like poor UV resistance and cracking at low temperatures.
Innovation Solution
Development of novel hyperbranched polymers (HBP-POSS) using POSS monomers in Ax-By polymerization, which provide a combination of proton, electron, and atomic oxygen resistance, transparency, and adhesion across a wide temperature range, along with curable groups for further reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional space solar cell adhesive (Dow Corning 93-500) is used, then ease of operation is maintained, but UV resistance, proton resistance, and atomic oxygen resistance are poor
Solution Approach 1:
The patent employs a composite material system combining hyperbranched polymer architecture with POSS (polyhedral oligosilsesquioxane) units. The POSS moieties provide radiation resistance through their inorganic-like silicon-oxygen cage structure, while the hyperbranched organic polymer matrix provides adhesion and processability. This composite structure achieves simultaneous UV resistance, proton resistance, and atomic oxygen resistance while maintaining ease of operation.
2Reliability
If POSS-modified materials are used, then atomic oxygen resistance is improved, but UV resistance and low-temperature adhesion deteriorate
Solution Approach 1:
The patent applies local quality by incorporating POSS units at specific locations within the hyperbranched polymer structure. The POSS moieties are distributed throughout the polymer matrix, providing localized radiation resistance where needed, while the hyperbranched polymer chains maintain flexibility and adhesion properties at low temperatures. This spatial distribution allows simultaneous achievement of atomic oxygen resistance and low-temperature adhesion.
3Reliability
If phenyl-containing materials are used, then proton resistance is improved, but UV resistance and adhesion deteriorate
Solution Approach 1:
The patent uses the hyperbranched polymer structure as an intermediary between the POSS units and the substrate. The hyperbranched architecture provides a flexible matrix that can accommodate phenyl-containing groups for proton resistance while maintaining UV resistance through the overall molecular structure. This intermediary structure allows the system to achieve proton resistance without sacrificing UV resistance or adhesion.
Data Source
AI summary
The HBP Free-POSS compounds of Formula I are superior to prior HB polymers and linear polymers in space and electronic applications because they have better resistance to electrons, protons and atomic oxygen, have superior out-gassing performance, and are transparent. They are used as coatings, films, adhesives, sealants and elastomers.