Abstract
Composite materials were prepared by the hot pressing method using poplar seed fibers and polycaprolactone (PCL) as the raw materials to solve the problems related to the recycling of waste fibers. The effects of mass fraction of poplar seed fibers, the volume density, and thickness on the sound absorption performance of the resulting composite materials were studied. The sound absorption coefficient curves of the composite material were obtained by the acoustic impedance transfer function method. The sound absorption coefficient of the composite material that was prepared under the optimal process conditions was higher than 0.7, and the effective sound absorption frequency band was wide. According to the box counting dimension method, which is based on the fractal theory, the fractal dimensions of the composite materials were calculated while using the Matlab program. The relationships between the fractal dimensions and the volume densities, mass fractions of poplar seed fibers, and thicknesses of the composite materials were also analyzed. Subsequently, the quantitative relationship between the fractal dimension and the sound absorption property parameters of the composite material was established in order to provide a theoretical basis for the design of the sound absorption composite material.
Highlights
Strengthening greening construction has become a widespread concern with the enhancement of people's awareness of ecological environment protection
Composite materials with mass fractions of poplar seed fibers of 25, 35, 45, 55, and 65% were prepared under technological conditions that consist of a volume density of 0.102 g/cm3 and a material thickness of 10 mm
Composite materials were prepared using poplar seed fibers and PCL as raw materials by the hot-pressing method to solve the problems related to the recycling of waste fibers
Summary
Strengthening greening construction has become a widespread concern with the enhancement of people's awareness of ecological environment protection. Ahmad et al [14] prepared the kenaf/bamboo fiber reinforced epoxy hybrid composite by the manual lamination method, and improved the sound absorption performance of the composite by introducing an air gap. It shows that increasing the porosity of the composite material is of great help in the improvement of the sound absorption capability of the material. Through experiments, that poplar seed fibers had low density, high hollowness, regular structure, plasticity, easy molding, easy curling, and winding together to form a large number of interconnected pores, which was expected to be more widely and deeply applied in the field of sound absorption field. The relationship between fractal dimension and average sound absorption coefficient, fractal dimension, and resonance sound absorption frequency was quantitatively described by the box counting method
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