【Literature Interpretation】Applied Polymer Science: Study on the synthesis and performance of eugenol-based silicone-modified waterborne polyurethane with excellent water resistance and mechanical properties

Keywords: Biomaterials, Mechanical Properties, Polyurethane Synthesis and Properties

Background introduction

Water-based polyurethane (WPU) is a green and environmentally friendly material, which is widely used in medicine, coatings, inks, biomedicine and other fields

In recent years, there have been many reports on the modification of WPU, which are mainly divided into two categories: cross-linking modification and organic-inorganic hybrid modification coating online coatingol.

In order to improve the mechanical properties and water resistance of WPU, Xiaojing Zhang and other researchers from the School of Chemical Engineering and Biological Engineering of Zhejiang University have developed a special diol, namely 4,4-(1,1,3,3- Tetramethyldisiloxane-1,3-dipropyl)bis-2-methoxyphenol (EUSi); it contains a silicone segment and two phenolic hydroxyl groups, which can be used as a new chain extender and can be obtained by reacting with isocyanate A series of bio-based waterborne polyurethanes with excellent performance

research content

1.

On the basis of previous methods, the synthesis process of EUSi is improved

2.

EUSi-WPU was prepared by prepolymerization method

3.

Pour the prepared water-based polyurethane into a polytetrafluoroethylene mold and place it at room temperature for 2 days

Results discussion

1.
Characterization of EUSi

2.
Particle size analysis of EUSi-WPU dispersion

3.
Fourier transform infrared spectroscopy analysis

4.
XDR analysis

5.
Thermal properties of EUSi-WPU

6.
DMA analysis

7.
Mechanical properties of EUSi- WPU

8.
Hydrophobicity of EUSi- WPU

in conclusion

Using eugenol and 1,1,3,3-tetramethyldisiloxane as raw materials, the bio-based silicon modifier EUSi was successfully synthesized through hydrosilation reaction (yield 95%)
.
Through infrared spectroscopy and hydrogen nuclear magnetic spectroscopy, it is proved that EUSi was successfully introduced into WPU
.
In addition, EUSi of different concentrations was used as a chain extender to introduce the WPU system through the reaction of phenolic hydroxyl and isocyanate groups to explore the changes in its performance
.
When the amount of EUSi added is 3%, the tensile strength of the material is increased from 6.
2 MPa to 22.
4 MPa, the water absorption rate of the material is significantly reduced (from 31.
3% to 7.
6%), and the thermal stability is improved (Tg is-at 10% EUSi 35.
6℃, which is 5.
6℃ higher than pure WPU)
.
Eugenol is a bio-based renewable material.
Compared with traditional solvent-based polyurethane, WPU is also an environmentally friendly material
.
This research provides a new method for the preparation of silicone-modified waterborne polyurethane, which can be used in the field of water-based ink adhesives
.

Reference materials: 

ZhangX, Cai Y, Zhang X, et al.
Synthesis and characterization of eugenol-basedsilicone modified waterborne polyurethane with excellent properties[J].
Journalof Applied Polymer Science, 2021,138:1-10