Double dynamic polymers
A polymer and polyurethane technology, applied in polyurea/polyurethane adhesives, adhesive types, organic chemistry, etc., can solve the problems of low quality recycled materials, achieve good modularity, enhance adhesion and self-healing performance effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0188] Example 1 - Synthesis of polymers according to the invention
[0189] Synthesis of dialdehyde precursors
[0190] 2-(2-(3-(6-isocyanatohexyl)ureido)-6-methyl-4-oxo-1,4-dihydropyrimidin-5-yl)ethyl (6-isocyanato Synthesis of Acatohexyl) Carbamate (A)
[0191]
[0192] 2-Amino-5-(2-hydroxyethyl)-6-methylpyrimidin-4(1H)-one (2.25 g, 13.3 mmol) was added to a 2-neck round-bottomed flask, followed by three vacuum / Air was purged under argon cycle and filled with DMF (10 mL). To this stirred suspension, cold hexamethylene diisocyanate (HDI) (20 mL, 124.9 mmol) and pyridine (2 mL) were added; the resulting white suspension was then heated at 90 °C overnight. After heating for 2 hours, complete dissolution of the white precipitate was observed and the clear colorless solution turned to a clear yellow overnight. The solution was then added dropwise to cold diethyl ether (300 mL), resulting in an off-white precipitate and a clear yellow liquid, which was decanted. The soli...
Embodiment 2
[0215] Example 2 - Mechanical properties of polymers according to the invention
[0216] Mechanical Properties of Thermoplastics
[0217] The behavior of the material in tension at very low strains was analyzed using Dynamic Mechanical (Thermal) Analysis (DMTA); the material was cut to approximately the following dimensions: 40mm x 10mm x 1mm. For each DMTA analysis, a sinusoidal force was used, with a strain starting at 0.6% and peaks and valleys at 0.8% and 0.4%, respectively. In the temperature range of -75 ° C to 150 ° C, and using the frequency range of 0.1 Hz to 15 Hz to observe the performance of the material, and then observe the change of storage modulus and loss modulus and tangent increment ( figure 1 a and figure 1 b). The mechanical response of a dual dynamic thermoplastic was compared to three different control materials: PBD TP CTLO (amine-modified condensation with hexamethylene diisocyanate), PBD TP CTL1 UPy (amine modified Condensation with compound A)...
Embodiment 3
[0226] Example 3: Self-healing properties of polymers according to the invention
[0227] Self-Healing Properties of Thermoplastics and Thermosets
[0228] Two different types of cuts are investigated for thermoplastic or thermoset materials, half-width and half-thickness (half-to-half) and half-width and full-thickness (half-to-full). The cut samples were repaired by heating in iron-like fashion at 50-70°C for thermoplastics and 110-120°C for thermosets for about 30 minutes. The samples showed near quantitative recovery of mechanical properties after 5 iron-like operating cycles.
[0229] The inventors have characterized the self-healing capabilities of different materials under mechanical loading, below and above the viscous flow transition point. All polyurethane samples showed self-healing ability at temperatures above the viscous flow temperature. Regardless of the chemical structure of the investigated elastomer, thermoplastics (TP) exhibit high self-healing capabilit...
PUM
| Property | Measurement | Unit |
|---|---|---|
| bond strength | aaaaa | aaaaa |
| bond strength | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More