Modification and applications of renewable biomass materials

doi:10.19491/j.issn.1001-9278.2022.12.007

Abstract

Abstract:

To reduce environmental pollution and improve the utilization rate of corn straw， the modified corn straw/epoxy resin biomass composites were prepared by using palm acyl chloride⁃modified corn straw as a filler and epoxy resin （EP） as a matrix resin. FTIR and XPS were used to characterize the structure of the straw before and after modification， the electronic universal testing machine was used to analyze the mechanical properties of the composites， and the SEM was used to analyze the micro morphology of the composites. The results show that there is a new C=O characteristic stretching vibration peak at 1 754 cm^-1 in the FTIR spectrum； In XPS energy spectrum， the contents of C1 （C=C， C—C） and C2 （C—O） decreased from 47.85 % and 40.24 % to 41.30 % and 30.64 %， respectively， and the contents of C3 （C=O） and C4 （C—O—C） increased from 9.12 % and 2.79 % to 20.56 % and 7.20 %， respectively. This indicates that the hydrophobicity of modified corn straw was enhanced and its compatibility with epoxy resin was improved. According to the analysis of mechanical properties， the tensile properties of epoxy resin composites increased by 100.3 % and 157.77 % compared with pure epoxy resin. Their bending strength increased at first and then tended to decrease. Compared to pure epoxy resin， the composites presented a maximum increase in impact strength by 16.8 % and 70.53 % when 10 wt % unmodified straw and 15 wt % modified straw were incorporated， respectively.

Key words: corn straw, palmitoyl chloride, epoxy resin, biomass material, mechanical property

CLC Number:

TQ 323.5

JIANG Siyu, LOU Chunhua, ZHOU Yongli. Modification and applications of renewable biomass materials[J]. China Plastics, 2022, 36(12): 44-49.

Figures/Tables 9

Fig.1. Infrared spectra of corn stalk before and after being modified

Fig.2. XPS spectra of corn stalk before and after being modified

Fig.3. Reaction mechanism diagram of modified corn straw

Fig.4. SEM photos of the impact section of epoxy resin and composite materials

Fig.5. Tensile stress⁃strain curve of epoxy resin matrix composites

玉米秸秆含量/%	未改性玉米秸秆/MPa	改性玉米秸秆/MPa
0	11.20	11.20
5	19.99	21.77
10	22.43	28.87
15	19.76	22.81
20	18.20	21.77

Tab.1. Tensile strength of epoxy matrix composites with different contents

Fig.6. Bending curve of epoxy resin matrix composites

玉米秸秆含量/%	未改性玉米秸秆/MPa	改性玉米秸秆/MPa
0	1.94	1.94
5	1.87	2.64
10	2.36	2.74
15	2.27	2.42
20	2.21	2.32

Tab.2. Bending strength of epoxy resin matrix composites with different content

Fig.7. Columnar chart of impact strength of epoxy resin matrix composites

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