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Comparison of performance differences of different plant fiber/PBS composite materials

Comparison of performance differences of different plant fiber/PBS composite materials

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  • Time of issue:2021-10-28
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(Summary description)100mesh, 120mesh sieve for use; Cellulose: prepared by the nitrate ethanol method; Holocellulose: prepared by the sodium chlorite method; Lignin: prepared by the hypochlorite method

Comparison of performance differences of different plant fiber/PBS composite materials

(Summary description)100mesh, 120mesh sieve for use; Cellulose: prepared by the nitrate ethanol method; Holocellulose: prepared by the sodium chlorite method; Lignin: prepared by the hypochlorite method

  • Categories:Trade News
  • Author:
  • Origin:
  • Time of issue:2021-10-28
  • Views:0
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100mesh, 120mesh sieve for use; Cellulose: prepared by the nitrate ethanol method; Holocellulose: prepared by the sodium chlorite method; Lignin: prepared by the hypochlorite method.

14 Preparation of composite materials. The plant fiber and the main components of plant fiber (cellulose, holocellulose, lignin) and PBS are mixed in a SK-160 double-roll open mixer (Shanghai Qicai Hydraulic Machinery Co., Ltd.) according to a certain mass ratio. ) Mix at 110°C for 10 minutes and then hot press to form a standard sample for tensile test.

1.3 Composite material performance test 1.3.1 XRD test: Use the D/Max-3c X-ray diffractometer produced by Rigalcu, Japan to test the crystallinity of cellulose and hemicellulose and composite materials.

2 Mechanical properties test: The mechanical properties of the composite material are in accordance with GB/T1040.3-2006, using the XWW-10A universal tensile testing machine produced by Chengde Jinjian Testing Instrument Co., Ltd., and the sample is stretched at a speed of 5mm/min. Load until the sample breaks, test 5 parallel samples of each type, and take the average value.

1.3.3 Thermogravimetric analysis: TGAQ500 thermogravimetric analyzer (TA company in the United States) is used to test, the test gas is nitrogen, the test temperature is 30°C~600°C, the program temperature rise rate is 10°C/min, and the test quality is 4 Contact angle test: using Shanghai Solon Technology SL200A/B/D series contact angle measuring instrument, using distilled water as the medium, the composite material sample fund project: Ministry of Science and Technology "863" project sub-project (2011AA100503) Western Province Education Department Industry Chemical Education Research Project (2010C01); National key of polymer materials engineering. After adding plant fiber, the contact angle of composite material is lower than that of pure PBS. With the increase of plant fiber addition, the contact angle of composite material continues to decrease. Among them, the contact angle of the bamboo fiber composite material is the largest, and the contact angle of the wheat straw fiber is the smallest. The strong polarity of cellulose and hemicellulose and the phenolic hydroxyl structure of the lignin molecule make the plant fiber have strong hydrophilicity. Therefore, when it is blended with hydrophobic PBS, the composite material is due to hydrophilicity. The addition of plant fiber increases its own hydrophilicity. On the other hand, due to the poor compatibility between the fiber and the matrix, the two are not in close contact, so the surface of the composite material and internal voids increase, and the hydrophilicity of the composite material is corresponding It is also enhanced, and as the plant fiber content increases, the hydrophilicity of the composite material also increases. The difference in the degree of hydrophilicity of different plant fiber/PBS composites depends on the difference in plant fiber properties. From Fig.6(a) and Fig.6(b), it can be seen that the cellulose and hemocellulose composite materials of bamboo fiber with good crystallinity are relatively weak in hydrophilicity, and the cellulose and heald of wheat fiber with poor crystallinity Cellulose composite materials are relatively hydrophilic. This is because the crystallinity is large, cellulose and holocellulose have fewer exposed hydroxyl groups, weak water absorption, good compatibility with PBS resin, close internal links of the composite material, few voids, and low hydrophilicity of the composite material. Fig.6(c) describes the hydrophilicity of different plant fiber lignin/PBS composite materials. The wheat straw fiber lignin composite materials generally show better hydrophilicity, and the bamboo fiber lignin composite materials are hydrophilic. Relatively weak, this difference is determined by the lignophenol hydroxyl group. The greater the phenolic hydroxyl group content, the stronger the hydrophilicity. In summary, the hydrophilicity of cellulose, holocellulose, and lignin directly determines the hydrophilicity of the fiber. The relatively high hydrophobicity of bamboo fiber cellulose, holocellulose, and lignin and the large The aspect ratio (bamboo fiber 133, rice straw fiber 114, wheat fiber 102) makes the internal bond of bamboo fiber tight, which directly leads to the relatively weak hydrophilicity of the composite material.

3 Conclusion As the plant fiber particles decrease, the mechanical properties of the composite material increase. As the amount of plant fiber increases, the tensile strength of the composite material first increases and then decreases, and the elongation at break gradually decreases.

Among    bamboo fiber, rice straw fiber, and wheat straw fiber, the bamboo fiber/PBS composite has the best mechanical properties, best thermal stability and good hydrophobic properties, followed by rice straw fiber, and wheat straw fiber is the worst.

The performance difference of plant fiber/PBS composite material depends on the difference of plant fiber performance. The higher the crystallinity of cellulose and holocellulose, the better the performance of cellulose and holocellulose/PBS composite material. Plant fiber/PBS composite material The better the performance.

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