[Retracted] A Performance of a Nanofiber Polymer in Geotechnical Engineering Support

Table 2

Common methods for preparation of geotechnical support.

Name	Definition	Advantage	Shortcoming
Electrospinning	It is a simple and effective process for obtaining nanoscale fibers by using a polymer solution to form a jet stream under high pressure for spinning processing	Similar to natural ECM, most suitable for cell migration and proliferation; scaffolds can be modified by electrospinning parameters	The fibers are denser, which is not conducive to the growth of cells
Fiber adhesion	It is to use the characteristics that two polymers have different solubility in a certain solvent and do not melt each other when heated, and one polymer is embedded in another polymer matrix, so that the polymer fibers are bonded at the intersection up to form a three-dimensional connected fiber network	Good porosity and a specific surface area can be obtained; facilitating cell adhesion and nutrient diffusion	Poor stability; strength and rigidity are low, and it is easy to cause damage to the planted cells
Pore former precipitation method	Porous scaffolds are prepared by uniformly mixing the screened particles, such as sodium chloride and citrate in a polymer solution, removing the solvent by freeze-drying or melting and casting, and the space occupied by them becomes pores	More than 93% hole team rate can be obtained; pore diameter can reach 500 μm	Uneven distribution of pores; only stents with a thickness of not more than 3 mm can be prepared
Melt molding	The polymer powder and the leachable phase are premixed uniformly, poured into an abrasive tool, heated to above the glass transition temperature of the polymer, and soaked in water after molding to remove the leachable phase to obtain a two-dimensional space scaffold with a complex structure	Pore height is regular and repeatable; the structure of the pores can be adjusted by the size and amount of the leachable phase	Heating the material during the preparation process can cause changes in the properties of the polymer, and the leachable phase is not easy to remove
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