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Surface-Functionalized TiH2 Nanoparticles for Simultaneous Reinforcement and Toughening of Highly Crystalline Polyurethane
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DOI：10.1002/pola.70225.png)
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Abstract
En 中文
Polyethylene glycol (PEG), owing to its excellent adhesion, broad compatibility with various components, and tunable molecular structure, has emerged as a research hotspot and a promising candidate in the field of high-performance binders. However, although the high crystallinity of PEG is beneficial in certain applications, excessive crystallization of the PEG soft segments at low temperatures can restrict molecular-chain mobility and deformability, thereby adversely affecting the low-temperature mechanical performance of PEG-based polyurethane binders. To overcome this critical limitation, this study proposes a strategy to enhance the mechanical performance of PEG-based polyurethane binders, namely by synergistically introducing surface-functionalized nano-titanium hydride (nano-TiH2) particles and a chain extender containing dynamic disulfide (S–S) bonds for modification. The incorporation of modified nano-titanium hydride leads to a relative reduction of approximately 20% in the crystallinity of the prepared PEG-based polyurethane. Meanwhile, the functional groups grafted onto its surface significantly enhance interfacial bonding with the matrix. This synergistic effect, combined with the efficient energy dissipation capability of the dynamic disulfide-containing chain extender, collectively leads to an improvement in the mechanical properties of the binder. The experimental results demonstrate that the prepared PEG-based polyurethane exhibits excellent mechanical properties, with a tensile strength of 12.44 MPa, an elongation at break of 1180.24%, and a toughness of 83.82 MJ/m3. Compared with traditional approaches that modify the polymer molecular chain structure, the use of a simple blending strategy with functionalized nanoparticles offers a highly promising route for enhancing the mechanical properties of binders.
Keywords:
binder
polyethylene glycol (PEG)
titanium hydride (TiH2)
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