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Comparison Of Performance Differences Between Different Plant Fibers/PBS Composites
Aug 12, 2018

100mesh, 120mesh sieve spare; cellulose: nitric acid preparation; hemicellulose: sodium chlorite method; lignin: hypochlorite method.

14 Preparation of composite materials The main components of plant fiber and plant fiber (cellulose, hemicellulose, lignin) and PBS in a certain mass ratio in SK-160 two-roller open type mixer (Shanghai Qi Cai Hydraulic Machinery Co., Ltd. The mixture was kneaded at 110 ° C for 10 min and then hot pressed to prepare a standard sample to be used for the tensile test.

1.3 Composite material performance test 1.3.1 XRD test: The crystallinity of cellulose and hemicellulose and composite materials were tested by D/Max-3c X-ray diffractometer manufactured by Rigalcu Company of Japan.

2Mechanical performance test: mechanical properties of composite materials According to GB/T1040.3-2006, XWW-10A universal tensile testing machine produced by Chengde Jinjian Testing Instrument Co., Ltd. was used to apply tensile force to the specimen at a speed of 5 mm/min. Load until the sample breaks, 5 parallel samples for each test, and take the average.

1.3.3 Thermogravimetric analysis: Tested by TGAQ500 thermogravimetric analyzer (TA company, USA), the test gas is nitrogen, the test temperature is 30 ° C ~ 600 ° C, the programmed temperature rate is 10 ° C / min, the test quality is 4 contact angle test: using Shanghai Solon Technology SL200A/B/D series contact angle measuring instrument, using distilled water as medium, composite material sample fund project: Ministry of Science and Technology "863" project sub-project (2011AA100503) Western Provincial Education Department industry Chemical research project (2010C01); the national key point 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 is decreasing. Among them, the bamboo fiber composite material has the largest contact angle, and the wheat straw fiber has the smallest contact angle. The strong polarity of cellulose and hemicellulose and the phenolic hydroxyl structure of lignin molecules make plant fibers more hydrophilic, so when blended with hydrophobic PBS, the composites are hydrophilic on the one hand. The addition of plant fiber increases the hydrophilicity of the self. On the other hand, due to the poor compatibility between the fiber and the matrix, the contact between the two is not tight, so the surface of the composite material and the internal voids increase, and the hydrophilicity of the composite material corresponds. It is also enhanced, and as the plant fiber content increases, the hydrophilicity of the composite increases. The difference in the degree of hydrophilicity of different plant fibers/PBS composites depends on the difference in plant fiber properties. It can be seen from Fig. 6(a), Fig. 6(b) that the cellulose and hemicellulose composites of bamboo fiber with good crystallinity have relatively low hydrophilicity, and the cellulose of wheat fiber with poor crystallinity is comprehensive. The hydrophilicity of the cellulose composite is relatively strong. This is because the crystallinity is large, the cellulose and hemicellulose have less exposed hydroxyl groups, and the water absorption is weak, and the compatibility with the PBS resin is good, the internal link of the composite material is tight, the voids are small, and the hydrophilicity of the composite material is small. Fig. 6(c) describes the hydrophilicity of different plant fiber lignin/PBS composites. The wheat straw fiber lignin composites generally show better hydrophilicity and the hydrophilicity of bamboo fiber lignin composites. Relatively weak, this difference is determined by the hydroxyl group of lignin, the greater the phenolic hydroxyl content, the stronger the hydrophilicity. In summary, the hydrophilicity of cellulose, hemicellulose and lignin directly determines the hydrophilicity of the fiber, the relatively high hydrophobicity of bamboo fiber cellulose, hemicellulose and lignin, and the large bamboo fiber. The aspect ratio (bamboo fiber 133, straw fiber 114, wheat fiber 102) makes the interior of the bamboo fiber tightly combined, which directly leads to the relatively weak hydrophilicity of the composite material.

3 Conclusions With the decrease of plant fiber particles, the mechanical properties of composites increase. With the increase of plant fiber content, the tensile strength of composites increases first and then decreases, and the elongation at break decreases gradually.

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

The difference in performance of plant fiber/PBS composites depends on the difference in plant fiber properties. The higher the crystallinity of cellulose and heald cellulose, the better the performance of cellulose and hemicellulose/PBS composites. Plant fiber/PBS composites The better the performance.

Hangzhou Hanford Technology Co., Ltd.

Address:Xinjie Industry Zone, Xiaoshan, Hangzhou, Zhejiang, China