Studying a Flexible Polyurethane Elastomer with Improved Impact-Resistant Performance

• Main Authors: Jitang Fan, Ang Chen
• Format: Article
• Language: English
• Published: MDPI AG 2019-03-01
• Series: Polymers
• Subjects: polyurethane elastomer; strain rate; impact-resistant performance; plastic zone; energy absorption
• Online Access: http://www.mdpi.com/2073-4360/11/3/467

A flexible polyurethane elastomer (PUE) is studied, and the improved impact-resistant performance is revealed. Compressive stress–strain curves over a wide loading rate range were derived. Under static loading, the rubbery-like characteristics are demonstrated, which are flexible and hyperelastic, to process a large strain of about 60% followed by full recovery upon unloading. Under high-rate loadingcompared with the mechanical data of polyurethane elastomer (PUE) and polyurea (PUA) materials in the literature. Orderly parallel deformation bands were formed from carrying a large strain. The fibrils were found between deformation bands for enhancing the yield/plateau stress. A considerable plastic zone ahead of propagating crack with numerous crazes and microcracks was produced for realizing the dynamic strain energy absorption. This work presents a scientific innovation for developing outstanding impact-resistant polyurethane elastomers for transparent protection engineering.