Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (10): 24-30.doi: 10.13475/j.fzxb.20210804907

• Fiber Materials • Previous Articles     Next Articles

Acoustic properties of palm fiber felt/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) hot-pressed composites

ZHANG Yi1(), SHAO Lifeng1, YANG Bin1, GAO Jinxia2, YU Chongwen3   

  1. 1. Zhejiang Industry Polytechnic College, Shaoxing, Zhejiang 312000, China
    2. Shaoxing Touzhen Textile Co., Ltd., Shaoxing, Zhejiang 312000, China
    3. College of Textiles, Donghua University, Shanghai 201620, China
  • Received:2021-08-10 Revised:2022-03-26 Online:2022-10-15 Published:2022-10-28

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Abstract:

In order to supplement the decreased production of jute-based acoustic composite materials for automobile interior, sound absorption properties of palm fiber felts/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) composites were studied. Following Johnson-Allard acoustic absorption model, the effects of different palm fiber felts/PHBV mass ratio, palm fiber surface density, palm fiber linear density, palm fiber gradient structure and porous pulverized coal ash aggregate on acoustic absorption were analyzed, inparalell to the investigation into the tensile properties, thermal stability properties, infrared spectrum and cross section of SEM morphology. The results show that the best mass ratio of palm fiber felt to PHBV for acoustic performance was 40∶60, the linear density of palm fiber was 14.5 dtex and the gradient structure of palm fiber mat was 143.3/102.5 g/m2. The average was the highest (0.53) for frequencies between 200 and 1 600 Hz. The addition of 5% porous coal ash ceramsite could increase the acoustic composite materials to 0.66, which has the potential to partially replace jute for the making acoustic composite materials.

Key words: palm fiber felt, composite material, gradient structure, acoustic composite materials, flow resistance

CLC Number: 

  • TS102.221

Tab.1

Impact of mass ratio of palm fiber felts and PHBV on acoustic absorption coefficient"

质量比 不同频率下复合材料的吸声系数 吸声系数
平均值
125 Hz 250 Hz 375 Hz 500 Hz 600 Hz 800 Hz 1 000 Hz 1 200 Hz 1 500 Hz 1 600 Hz
30∶70 0.09 0.15 0.19 0.26 0.34 0.43 0.48 0.52 0.55 0.57 0.36
40∶60 0.19 0.24 0.35 0.51 0.65 0.69 0.72 0.74 0.78 0.81 0.57
50∶50 0.15 0.21 0.27 0.40 0.51 0.59 0.61 0.66 0.71 0.73 0.48
60∶40 0.13 0.19 0.23 0.34 0.45 0.55 0.60 0.63 0.68 0.71 0.45

Tab.2

Impact of density of palm fiber felts on acoustic absorption coefficient"

面密度/
(g·m-2)		 不同频率下复合材料的吸声系数 吸声系数
平均值
125 Hz 250 Hz 375 Hz 500 Hz 600 Hz 800 Hz 1 000 Hz 1 200 Hz 1 500 Hz 1 600 Hz
102.5 0.11 0.10 0.13 0.15 0.20 0.26 0.39 0.45 0.56 0.60 0.28
143.3 0.12 0.11 0.16 0.23 0.33 0.45 0.51 0.59 0.63 0.68 0.38
206.2 0.11 0.09 0.12 0.16 0.19 0.24 0.35 0.42 0.46 0.51 0.26

Tab.3

Impact of liner density of palm fiber on acoustic absorption coefficient"

线密度/
dtex		 不同频率下复合材料的吸声系数 吸声系数
平均值
125 Hz 250 Hz 375 Hz 500 Hz 600 Hz 800 Hz 1 000 Hz 1 200 Hz 1 500 Hz 1 600 Hz
14.5 0.12 0.11 0.22 0.29 0.37 0.49 0.54 0.60 0.68 0.70 0.41
15.8 0.11 0.09 0.18 0.24 0.29 0.38 0.47 0.52 0.57 0.63 0.35
16.5 0.09 0.08 0.15 0.18 0.23 0.28 0.35 0.41 0.45 0.52 0.27

Tab.4

Impact of gradient structures of palm fiber felt on acoustic absorption coefficient"

梯度结构
(g·m-2)		 不同频率下复合材料的吸声系数 吸声系数
平均值
125 Hz 250 Hz 375 Hz 500 Hz 600 Hz 800 Hz 1 000 Hz 1 200 Hz 1 500 Hz 1 600 Hz
102.5/143.3 0.05 0.13 0.24 0.31 0.37 0.42 0.47 0.52 0.57 0.64 0.37
122.9/122.9 0.06 0.15 0.29 0.35 0.43 0.49 0.54 0.59 0.63 0.74 0.43
143.3/102.5 0.09 0.19 0.35 0.46 0.55 0.61 0.68 0.73 0.77 0.83 0.53

Tab.5

Impact of mixing fly ash aggregates on acoustic absorption coefficient"

质量分
数/%		 不同频率下复合材料的吸声系数 吸声系数
平均值
125 Hz 250 Hz 375 Hz 500 Hz 600 Hz 800 Hz 1 000 Hz 1 200 Hz 1 500 Hz 1 600 Hz
0 0.09 0.19 0.35 0.46 0.55 0.61 0.68 0.73 0.77 0.83 0.53
5 0.14 0.27 0.47 0.60 0.69 0.82 0.86 0.89 0.92 0.93 0.66
10 0.13 0.24 0.43 0.57 0.66 0.71 0.74 0.78 0.81 0.86 0.59

Fig.1

SEM images of palm fiber (a) and palm fiber felts/PHBV composites (b)"

Fig.2

Infrared spectrum of palm fiber felts/PHBV composites"

Fig.3

TG(a) and DTG(b) curves of palm fiber felt/PHBV acoustic absorption composites"

Fig.4

Stress-strain curve of palm fiber felts/PHBV acoustic absorption composites"

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