Abd Wahab, Hanani (2023) Optimization of acoustic performance of ultraviolet irradiated bio-epoxy foam composites using design of experiments method. Doctoral thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

The demand for eco-friendly products and comprehensive environmental knowledge is rising rapidly. Another factor to consider is the end-user application of the synthesis materials and designs. As a result, one strategy for its use is to noise, which is now considered to be an environmental pollution that negatively impacts public health. This study aimed to investigate the potential of polymer foam composites as sound absorptive materials, with three (3) objectives. Firstly, bio-epoxy (B) and synthetic epoxy (E) monomers were used to produce polymer foam composites with varying wood fiber filler loadings. Secondly, the morphological, stability, viscoelastic, and acoustical properties of PU foam composites upon ultra-violet (UV) irradiation exposure were investigated. Thirdly, the effects of various input factors on the sound absorption performance of polyurethane foam composites were studied using a combination of factorial and Taguchi design experiments. The effects of UV irradiation on the morphological, stability, viscoelastic, and acoustical properties of PU foams made with bio-epoxy and synthetic epoxy were also investigated. The results showed that both bio-epoxy (B) and synthetic epoxy (E) PU foams experienced changes in their properties upon UV irradiation exposure, with bio-epoxy (B) demonstrating higher stability under UV irradiation. The results showed that the filler loading had the most significant impact on sound absorption coefficient (α), and synthetic epoxy (E) PU foams with higher filler loading resulted in a significant increase in sound absorption coefficient. The results indicated that the acoustic properties of PU foam composites could be improved (0.05%) by optimizing the formulation of PU foams with the best combination values. The study suggests that bio-epoxy (B) PU foams can become a good substitute for synthetic epoxy (E) PU foams as sound absorptive materials

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