Abstract
With the application of biomimetic shark skin microstructures with hydrophobicity in microfluidics, sensors and self-cleaning materials, microstructure processing methods are increasing. The preparation process has higher requirements for processing cost and efficiency. In this paper, linear low-density polyethylene (LLDPE) hydrophobic films were prepared with the help of melt fracture phenomenon. The equipment is a self-made single screw extruder. By adjusting the process parameters, the biomimetic shark skin structured LLDPE films with good hydrophobic property can be obtained. The surface microstructure shape of the product is related to kinds of additive, die temperature and screw speed. When AC5 was selected as an additive, the optimal processing parameter was found to be 160 °C die temperature and 80 r/min screw speed. A contact angle of 133° was obtained in this situation. In addition, the influences of die temperature and screw speed on the size of shark skin structure were also systematically investigated in this paper. It was found that the microstructure surface with hierarchical roughness had a better hydrophobic property.
Highlights
The surface of the material with a particular shape of microstructure characteristics has some specific physical and chemical functions
Comprehensive research on functional surfaces of polymer microstructures at home and abroad, it shows that the key to the preparation of biomimetic microstructures lies in the precise shaping of the structure
In terms of the integrity and uniformity of microstructure size, the samples prepared by linear low-density polyethylene (LLDPE)/AC5 (9:1) had the worst integrity, the smallest contact angle and poor hydrophobic property
Summary
The surface of the material with a particular shape of microstructure characteristics has some specific physical and chemical functions. As the shear rate increases, the surface of the extrudate begins to periodically show some small-amplitude and high-frequency corrugated disturbances This phenomenon is commonly referred to as “shark skin distortion”. Polymers 2021, 13, 4299 on the outer layer of the PDMS membrane, which had super hydrophobicity, and inhibited bacterial adhesion and accelerated wound healing By this means, we can create and precisely control the process conditions that produce similar “shark skin” microstructures. We can create and precisely control the process conditions that produce similar “shark skin” microstructures In this way, a microstructures with a certain arrangement pattern can be formed on the surface of the polymer, especially on the inner wall of the pipe. Additives include AC3 (erucamide antiblocking agent, produced from Yisheng Chemical, Dongguan, China), AC5 (oleamide antiblocking agent, produced from Yisheng Chemical, Dongguan, China), AC15 (silicon dioxide and erucamide antiblocking agent, produced from Yisheng Chemical, Dongguan, China), and 180 (polyethylene antiblocking agent, produced from Dinghai Plastic Chemical, Dongguan, China)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
