Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (12): 42-47.doi: 10.13475/j.fzxb.20210906506

• Fiber Materials • Previous Articles     Next Articles

Structural characteristics and sound absorption performance of waste corn straw

LÜ Lihua(), LI Zhen   

  1. School of Textile and Material Engineering, Dalian Polytechnic University, Dalian, Liaoning 116034, China
  • Received:2021-09-01 Revised:2022-05-13 Online:2022-12-15 Published:2023-01-06

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Abstract:

In order to recycle effectively the waste corn straw, sound-absorbing composites with a thickness of 1.5 cm were prepared by hot pressing the waste straw pellets with length of 1.5 mm, 6 mm, and 10 mm, cotton fiber and hemp fiber as reinforcement materials, and polycaprolactone as the matrix material. The sound absorption capabilities of the composites were evaluated and compared using the acoustic impedance transfer function approach. The results demonstrate that the 1.5 mm length of waste corn straw is suitable for the creation of sound-absorbing composites because it has the best sound absorption performance, with a maximum absorption coefficient of 0.71, an average absorption coefficient of 0.50, and a noise reduction coefficient of 0.51. The oxyhexacyclic structure on the main chain in corn straw cellulose macromolecule provides the basis for repeated reflection and refraction of sound waves. The high linearity enables the hydrogen bonds and other single bonds to rotate freely, which increases the consumption of sound energy. Moreover, the low crystallinity of waste corn straw makes the sound energy easy to propagate along the molecular chain, thus converting the sound energy into the vibration dissipation of the molecular chain.

Key words: waste corn straw, sound absorption material, structural characteristic, sound absorption performance, sound absorption mechanism, polycaprolactone

CLC Number: 

  • TS102.9

Fig.1

Physical pictures of composites prepared by different reinforcement systems. (a) Waste straw composite;(b) Cotton fiber composite;(c) Hemp fiber composite"

Fig.2

Sound-absorbing coefficient curves of composites prepared by different reinforcement systems"

Tab.1

Average sound absorption coefficient and noise reduction coefficient of composite materials"

样品名称 平均吸声系数 降噪系数
1.5 mm 废弃秸秆复合材料 0.50 0.51
6 mm 废弃秸秆复合材料 0.37 0.36
10 mm 废弃秸秆复合材料 0.36 0.28
棉纤维复合材料 0.20 0.16
大麻纤维复合材料 0.26 0.24

Fig.3

Structural formula of cellulose Ⅰ"

Fig.4

β-D-glucose chair-type oxygen hexacyclic structure. (a) Ball and stick model;(b) Ball and Structural formula"

Fig.5

Structure of xylopyranose. (a)Ball and stick model;(b) Structural formula"

Fig.6

XRD patterns of waste corn straw"

Fig.7

SEM images of morphological structure of waste corn straw. (a) Apparent morphology of waste corn straw core particles(×60);(b) Hollow structure of straw core(×200);(c) Hollow structure of straw skin(×300); (d) Microstructure of inner surface of straw skin(×600);(e) Microstructure of outer surface of straw skin(×300)"

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