Highly stretchable, high efficiency room temperature self-healing polyurethane adhesive based on hydrogen bonds – applicable to solid rocket propellants
| Autor: | Li Pingyun, Xiang Guifeng, Xu Heng, Chen Ling, Guo Xiaode, Tu Jing |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Propellant
Materials science Polymers and Plastics Organic Chemistry Thermal decomposition Bioengineering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Isocyanate 0104 chemical sciences chemistry.chemical_compound Polypropylene glycol chemistry Ultimate tensile strength Adhesive Composite material 0210 nano-technology Polyurethane Isophorone |
| Zdroj: | Polymer Chemistry. 12:4532-4545 |
| ISSN: | 1759-9962 1759-9954 |
| DOI: | 10.1039/d1py00439e |
| Popis: | The formation and expansion of cracks in a propellant would induce debonding at the interface between different constituents and may even cause explosion of the propellant during launch. One way to prohibit debonding is the employment of self-healing polyurethane adhesives, which can heal cracks in the early stage. In this work, polypropylene glycol and isophorone diamine were used to prepare polyurethane adhesive with high-efficiency self-healing ability. The differences between the mechanical and self-healing properties of polyurethanes with a hard segment structure composed of different isocyanates were studied. The experimental results showed that PPG-IP-PA (polyurethane synthesized using polypropylene glycol, isophorone isocyanate and isophorone diamine) has excellent mechanical properties and high-efficiency room temperature self-healing ability. When compared with other polyurethanes, PPG-IP-PA has a strong molecular chain motion ability, and its continuous ring hard segment structure ensures the overall mechanical properties. Its maximum tensile strength can be up to 3.85 MPa and elongation at break almost reached 3000%. After placing at room temperature for 12 h, the mechanical properties of PPG-IP-PA can be fully restored. When PPG-IP-PA was applied to a propellant, it can restore 70% of the tensile strength of the completely broken grain after being placed at room temperature for 12 h, and there was no obvious interference to the thermal decomposition of AP-Al components. Our results provide a new designing concept in dealing with the debonding of components in propellants. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|