Polyurethane-Based Electronic Packaging: The Characterization of Natural Aging over a Decade.

Area of Science:

• Materials Science
• Polymer Chemistry
• Environmental Degradation

Background:

• Electronic devices require robust packaging for longevity.
• Polyurethane potting is used for electronic encapsulation.
• Long-term environmental effects on polyurethane require investigation.

Purpose of the Study:

• To investigate the natural aging mechanism of polyurethane electronic potting.
• To assess the protective capabilities of aged polyurethane encapsulants.
• To determine the suitability of polyurethane for long-term electronic device storage.

Main Methods:

• 10-year natural aging study in a Chinese tropical marine atmosphere.
• Analysis of polyurethane electronic potting using appearance inspection, molecular structure, elemental content, and chemical functional group analysis.
• Comparison of surface and interior properties of the aged material.

Main Results:

• Polyurethane potting showed significant surface yellowing and chemical changes, including decreased tolylene diisocyanate and altered carbamate group peaks.
• Surface urethane groups oxidized into chromophores, causing discoloration.
• Despite aging, the interior potting maintained material integrity.
• Internal electronic devices remained protected and functional within acceptable ranges.

Conclusions:

• Polyurethane electronic potting undergoes surface aging via oxidation, leading to yellowing.
• The material effectively protects encapsulated electronic devices even after prolonged environmental exposure.
• Polyurethane potting is suitable for long-term sealed storage of electronic devices.