Effect of TEOS modification and long straw fiber orientation on properties of PP/SF composites

doi:10.19491/j.issn.1001-9278.2024.02.003

Abstract

Abstract:

In this paper， tetraethyl orthosilicate （TEOS） and ammonia were used to prepare a solution gel to modify the surface of straw fibers （SF）. The changes in chemical composition， surface morphology and hydrophobicity of SF before and after the modification were investigated. Long⁃SF⁃reinforced polypropylene （PP） composites were prepared through hot pressing， and the mechanical strength of PP/SF composites before and after the solution gel modification of long SF were compared. The PP/SF composites were designed and prepared with five different straw orientations of 0 °， 15 °， 30 °， 45 ° and 90 °， and the effects of orientation angle on the mechanical strength of the composites were investigated. The experimental results indicated that the SiO₂ particles deposited on the surface of the TEOS⁃treated SF could help to improve the hydrophobicity and roughness of the fiber surface， thus enhancing the infiltration and compatibility between SF and PP. Compared to PP composite with untreated SF， the tensile， flexural， and impact strengths of the composites with TEOS⁃treated SF were improved by 20.3 %， 11 %， and 35.7 %， respectively. The orientation angle of the fibers has a great influence on the mechanical strength of PP/SF composites. The smaller the angle between the orientation direction of SF and the direction of the applied stress， the more can the SF exert their reinforcing effect， and the higher are the tensile， flexural and impact strengths.

Key words: wheat straw, polypropylene, solution gel modification, orientation angle, mechanical strength

CLC Number:

TQ325.1⁺4

RUAN Fangtao, WU Hao, ZHU Jinwei, SU Yongsheng, CHEN Zhuolin, WANG Guofeng, WANG Hongjie. Effect of TEOS modification and long straw fiber orientation on properties of PP/SF composites[J]. China Plastics, 2024, 38(2): 14-19.

Figures/Tables 10

Fig.1. Schematic diagram of TEOS approach to the treatment of straw fibers

Fig.2. Photo of the samples

Fig.3. PP/SF composites

Fig.4. FTIR spectra of the samples

Fig.5. Contact angles of SF surfaces

Fig.6. SEM images of the SF

Fig.7. Impact fractional morphology of the PP/SF composites

Fig.8. Effect of TEOS treatment on mechanical properties of the PP/SF composites

Fig.9. Effect of orientation angle on tensile strength of the PP/SF composites

Fig.10. Effect of orientation angle on the bending strength and impact strength of PP/SF composites

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