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A Comprehensive Study on the Degradation Behavior and Mechanism of Expanded Thermoplastic Polyurethane
Wei Zhao1,2, Shiying Luo2, Qing Zhuo1,2
1Key Laboratory of Green Manufacturing of Super-Light Elastomer Materials of State Ethnic Affairs Commission, Hubei Minzu University, Enshi 445000, China.
Polymers
|April 26, 2025
Summary
Expanded thermoplastic polyurethane (ETPU) ages primarily due to combined light, heat, and humidity, not just heat alone. This leads to structural damage and a reduced lifespan, estimated at two years under natural conditions.
Area of Science:
- Materials Science
- Polymer Science
- Durability Testing
Background:
- Expanded thermoplastic polyurethane (ETPU) offers versatile applications but suffers from property degradation over time.
- Understanding ETPU aging is crucial for predicting its service life and optimizing material performance.
Purpose of the Study:
- To investigate the aging mechanisms and deterioration trends of ETPU under various environmental conditions.
- To provide reliable data for ETPU aging properties and lifetime prediction.
Main Methods:
- ETPU samples subjected to thermal aging (80 °C for 28 days), xenon lamp aging (80 °C, UV irradiation for 28 days), and natural weathering (671 days).
- Structural characterization and performance tests conducted on aged ETPU samples.
Main Results:
- Thermal aging alone is not the primary cause of ETPU degradation.
- Combined exposure to light, heat, and humidity significantly damages the internal structure and performance.
- The heterogeneous structure's bead interface acts as a defect site post-aging, impacting mechanical properties.
Conclusions:
- ETPU aging is accelerated by the synergistic effects of light, heat, and humidity.
- The material's heterogeneous structure influences its aging behavior and mechanical integrity.
- The estimated natural service lifetime of ETPU is approximately two years.
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