Effect of alkali⁃treated coir⁃geotextile on the tensile properties of epoxy resin⁃based materials

doi:10.19491/j.issn.1001-9278.2024.04.005

Abstract

Abstract:

To evaluate the effect of alkali treatment of coir⁃geotextile on the tensile properties of epoxy⁃based materials， two types of alkali solutions， NaOH and NaHCO₃， were used for pretreating the coir⁃geotextile and the effects of alkali solution concentration and treatment time on the surface morphology of the coir⁃geotextile was investigated. The coir⁃geotextile with epoxy resin as a substrate was prepared. The results indicated that after the coir⁃geotextile was treated with 5 % NaOH solution for 6h and 10 % NaHCO₃ solution for 96~168 h， the tensile enhancement effect on the epoxy⁃based materials presented good consistency， resulting in a maximum value. Based on the analysis of microstructure and FTIR， the surface contour of the coir fiber gradually showed more explicit characteristics with an increase in the treatment time with alkali solutions. Beyond the appropriate treatment time， the coir fiber showed a rougher surface， accompanied by a more apparent large⁃area corrosion phenomenon. The surface of coir fiber treated with 10 % NaHCO₃ solution for 96~168 h is similar to that with 5 % NaOH solution for 6h. The treatment with an NaHCO₃ solution did not damage the cellulose structure of the fiber surface and also did not increase the surface roughness of the fiber significantly.

Key words: coir?geotextile, epoxy resin, alkali treatment, tensile property

CLC Number:

TQ323.5

ZHANG Qingsong, LI Liangyong, CAO Weiqiang, CHENG Yanwen, PENG Tianxiang, WANG Juntong, LI Houyang. Effect of alkali⁃treated coir⁃geotextile on the tensile properties of epoxy resin⁃based materials[J]. China Plastics, 2024, 38(4): 26-31.

Figures/Tables 9

Fig.1. Preparation flow chart

样品	处理时间/h
样品	0.5	1	2	6	12	24	96	168
未处理	4.08
5 % NaOH	5.19	5.62	6.14	10.6	7.42	6.14	5.43	3.42
10 % NaOH	7.21	4.35	2.46	2.7	2.7	2.2	1.95	1.73
10 %NaHCO₃	4.12	4.15	4.18	4.21	4.32	4.48	7.86	10.57

Tab.1. Tensile strength of coir⁃geotextile reinforced epoxy resin

Fig.2. Tensile force versus elongation of epoxy resin⁃based materials made of alkali⁃treated coir⁃geotextile

Fig.3. Microscopic⁃morphology of untreated coir fiber

Fig.4. Micro⁃morphology of coir fibers treated with 5 %NaOHsolutions after various treatment duration

Fig.5. Micro⁃morphology of coir fibers treated with 10 % NaOHsolutions after various treatment duration

Fig.6. Micro⁃morphology of coir fibers treated with 10 % NaHCO3 solutions after various treatment duration

Fig.7. FTIR of the coir fiber

Fig.8. Tensile failure result

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