![Synthesis of a novel UV-curable prepolymer 1,3-bis[(3-ethyl-3-methoxyoxetane)propyl]tetramethyldisiloxane and study on its UV-curing properties Cover](https://sciendo-parsed.s3.eu-central-1.amazonaws.com/64725287215d2f6c89dc41c3/cover-image.jpg)
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Analytical table of the 1H-NMR spectrum for the 3-ethyl-3-allylmethoxyoxetane_
| Location of H | Chemical shift/(δ/ppm) | Structural formula |
|---|---|---|
| 1 | 0.86 | 3H, -CH3 |
| 2 | 1.73 | 2H, -CH2- |
| 3 | 3.53 | 2H, -CH2- |
| 4 | 3.97 | 2H, -CH2- |
| 5 | 5.87 | H, -CH= |
| 6 | 5.24 | 2H, =CH2 |
| 7 | 4.36 | 2H, -CH2- |
| 8 | 4.42 | 2H, -CH2- |
Mechanical property test results of the prepolymer UV-cured samples_
| Numbering | Tensile strength /MPa | Elastic modulus /MPa | Elongation at break /% |
|---|---|---|---|
| 1 | 26.28 | 3,028.72 | 4.13 |
| 2 | 23.99 | 2,831.19 | 3.89 |
| 3 | 22.97 | 2,730.26 | 4.23 |
| 4 | 27.90 | 3,195.19 | 3.96 |
| 5 | 28.62 | 2,890.40 | 4.26 |
| Average value | 25.95 | 2,935.15 | 4.09 |
| Standard deviation | 2.19 | 161.97 | 0.15 |
Mechanical property test results of the 2021p UV-cured samples_
| Numbering | Tensile strength/MPa | Elastic modulus/MPa | Elongation at break/% |
|---|---|---|---|
| 1 | 32.11 | 3,165.01 | 2.63 |
| 2 | 24.17 | 3,454.75 | 2.58 |
| 3 | 34.87 | 2,719.27 | 2.13 |
| 4 | 26.26 | 3,012.03 | 2.67 |
| 5 | 25.76 | 2,855.39 | 2.08 |
| Average value | 28.63 | 3,041.29 | 2.42 |
| Standard deviation | 4.60 | 285.21 | 0.29 |
Materials and reagents_
| Materials and reagents | Purity (%) | Manufacturer |
|---|---|---|
| Diethyl carbonate | 99.7 | Sinopharm Chemical Reagent Co., Ltd |
| Trihydroxypropane | 99.7 | Sinopharm Chemical Reagent Co., Ltd |
| Anhydrous magnesium sulfate (solid) | Sinopharm Chemical Reagent Co., Ltd | |
| Potassium hydroxide (solid) | Tianjin Damao Chemical Reagent Factory | |
| Allyl bromide | 99.7 | Tianjin Damao Chemical Reagent Factory |
| Toluene | 99.9 | Xilong Chemical Co., Ltd |
| Dichloromethane | 99.7 | Xilong Chemical Co., Ltd |
| Tetrabutylammonium bromide | 99.7 | Xilong Chemical Co., Ltd |
| Triarylsulfonium hexafluoroantimonate (UV-6976) | 99.7 | Dow Union Carbide |
| 1,1,3,3-tetramethyldisiloxane | 99 | Shanghai Chuqing New Material Co., Ltd. |
| Karstedt catalyst | 99.5 | Shanghai Aladdin Technology Co., Ltd. |
| E-51 epoxy resin | 98 | Shanghai Resin Factory |
| 2021p alicyclic epoxy resin | 98 | Daicel (China) Investment Co., Ltd |
Analytical table of the 1H-NMR spectrum for the 3-ethyl-3-hydroxymethyloxetane_
| Location of H | Chemical shift /(δ/ppm) | Structural formula |
|---|---|---|
| 1 | 0.77 | 3H, -CH3 |
| 2 | 1.60 | 2H, -CH2- |
| 3 | 3.58 | 2H, -CH2- |
| 4 | 3.74 | H, -OH |
| 5 | 4.28 | 2H, -CH2- |
| 6 | 4.33 | 2H, -CH2- |
Mechanical property test results of the E-51 UV-cured samples_
| Numbering | Tensile strength/MPa | Elastic modulus/MPa | Elongation at break/% |
|---|---|---|---|
| 1 | 20.75 | 2,224.11 | 5.83 |
| 2 | 19.60 | 1,912.03 | 6.12 |
| 3 | 21.03 | 2,329.58 | 4.76 |
| 4 | 20.57 | 2,168.32 | 4.92 |
| 5 | 18.44 | 1,895.36 | 5.43 |
| Average value | 20.08 | 2,105.88 | 5.41 |
| Standard deviation | 1.06 | 193.53 | 0.58 |
Analytical table of the 1H-NMR spectrum for the 1,1,3,3-tetramethyldisiloxane_
| Location of H | Chemical shift/(δ/ppm) | Structural formula |
|---|---|---|
| 1 | 0.17 | 12H, -CH3 |
| 2 | 4.66 | 2H, -Si-H |
Analytical table of the 1H-NMR spectrum for the prepolymer_
| Location of H | Chemical shift/(δ/ppm) | Structural formula |
|---|---|---|
| 1 | 0.02 | 12H, -CH3 |
| 2 | 0.47 | 4H, -CH2- |
| 3 | 1.55 | 4H, -CH2- |
| 4 | 3.37 | 4H, -CH2- |
| 5 | 3.49 | 4H, -CH2- |
| 6 | 1.70 | 4H, -CH2- |
| 7 | 0.85 | 6H, -CH3 |
| 8 | 4.35 | 4H, -CH2- |
| 9 | 4.41 | 4H, -CH2- |