Study on hydrophobicity of surface texture of PE⁃UHMW

doi:10.19491/j.issn.1001-9278.2024.09.006

Abstract

Abstract:

Aiming at the problems in the high surface adhesion of ultrahigh⁃molecular⁃weight polyethylene （PE⁃UHMW） with viscous materials as well as its poor cleaning performance， the surface of PE⁃UHMW was modified with microstructure by using a laser marking machine， and then its hydrophobicity was characterized by using a contact angle tester. The results indicated that the surface modification increased the hydrophobicity of PE⁃UHMW by 50 %， resulting in its anti⁃adhesion performance with a self⁃cleaning ability. The hydrophobicity of PE⁃UHMW was investigated through forming different types of microstructures on the modified surface， and the results showed that the bionic hogweed texture⁃modified surface had the best hydrophobicity. Based on this rule， the optimal processing parameters of the microstructural hydrophobicity could be achieved by an optimized combination of processing parameters for the hydrophobicity of the hogweed bionic microstructure. This combination was determined to be a fabric size of 400 μm， a transverse spacing of 100 μm， and a vertical spacing of 100 μm. Through varying the size of the texture， a relationship between the hydrophobicity of the texture and area ratio could be derived. The hydrophobicity increased and then decreased with an increase in the texture area ratio， and the maximum was achieved at a weaving area ratio of approximately 18.5 %.

Key words: surface texture, hydrophobicity, anti?adhesion, self?cleaning

CLC Number:

TQ325.1⁺2

SONG Long, ZHONG Wen. Study on hydrophobicity of surface texture of PE⁃UHMW[J]. China Plastics, 2024, 38(9): 30-35.

Figures/Tables 14

Fig.1. Six microstructured shapes

Fig.2. Principle of surface structuring

Fig.3. Confocal morphology of hydrophobic surfaces

Fig.4. Process flow for the preparation of PE⁃UHMW

实验组别	织构大小/μｍ	横向间距/μｍ	纵向间距/μｍ
A	200	0	100
B	200	100	150
C	200	200	200
D	300	0	150
E	300	100	200
F	300	200	100
G	400	0	200
H	400	100	100
I	400	200	150

Tab.1. Orthogonal experimental data

Fig.5. Contact angle of hexagonal microtexture

Fig.6. Contact angles of five textures and PE⁃UHMW surfaces

Fig.7. Contact angles of each group in orthogonal experiments

Fig.8. Contact angle data for different sizes of hexagonal microtexture

Fig.9. Contact angle bar diagram of different textures

Fig.10. Layout diagram of hexagonal microtexture

Fig.11. Contact angle data of each group in orthogonal experiments

组号	影响因素			接触角/（°）
组号	a	b	c	接触角/（°）
A	1	1	1	122.813
B	1	2	2	138.945
C	1	3	3	134.389
D	2	1	2	129.583
E	2	2	3	116.270
F	2	3	1	136.687
G	3	1	3	136.453
H	3	2	1	141.638
I	3	3	2	123.944
接触角/（°）	k₁	132.049	129.616	133.713
	k₂	127.514	132.284	130.824
	k₃	134.012	131.674	129.037
	R	6.498	2.668	4.675
	最优组合	a3	b2	c1
	影响因素	a>c>b

Tab.2. Results of orthography experiment and range analysis

Fig.12. Contact angles of different texture sizes

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