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Study on the Speed-induced Extensibility Behavior and Mechanism of Double Soft Phase Thermoplastic Elastomers
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DOI：10.11777/j.issn1000-3304.2025.25266.png)
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Abstract
En 中文
Regulating the viscoelasticity of thermoplastic elastomers (TPE) to achieve speed-induced extensibility (SIE) behavior, where the modulus, strength, and elongation at break increase simultaneously with increasing tensile rate, is an intriguing scientific issue. In this study, dihydroxyl-terminated poly(dimethylsiloxane)(PDMS)and poly(tetrahydrofuran)(PTMEG), which are thermodynamically incompatible, were selected as soft segments.By adjusting the hard segment content, a series of thermoplastic polyurethane (TPU) elastomers with a dual soft-phase structure were constructed.In situ small-angle X-ray scattering (in situ SAXS) was employed to track the structural evolution of these elastomers during deformation. It was proposed that the interface diffusion and mixing of the dual soft-phase significantly prolong the relaxation time of chains, thereby promoting large-scale chain slippage, leading to distinct SIE behavior. The confirmation of this process provides a new perspective for understanding the microstructural evolution of TPE during long-range deformation and will offer guidance for the design of novel high-performance elastomers.
Keywords:
Polyurethane
Stretching speed
Microphase separation
Speed-induced extensibility
Elastomer
Journal
A
IF:
1.3
Papers:
180
Citations:
1.2K
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