Influence of multilayer textile biopolymer foam doped with titanium dioxide for sound absorption materials

摘要

Biopolymer foam was prepared by the reaction of bio-monomer based on vegetable oilwith commercial Polymethane Polyphenyl Isocyanate (Modified Polymeric-MDI) and titaniumdioxide (TiO2). The acoustic study of biopolymer foam with 2.5% TiO2 loading was examined byimpedance tube test according to the ASTM E-1050 and laminated with three types of textile suchas polyester, cotton and single knitted jersey. It was revealed that the thicker the fabric the higherthe sound absorption coefficient (α) at low frequency level. The higher the number of layers orthickness of the fabric, the sound absorption through the fabric increases at low frequency but afterthe maximum it remains almost unaltered. Three layer of cotton fabric gives maximum αapproximately equal to 0.578 which is 1.472mm thickness at low frequency level of 1000-2000Hzand single knitted jersey gives maximum α at 3th layer. Meanwhile , the α of biopolymer foam with2.5% TiO2 loading laminated with polyester fabric approximately equal to 1 at lower frequencylevel of 1000-2000Hz with lower thickness that is 0.668mm. Polyester fabric with lowest thicknessshows better α at lower frequency level due to the structure of the fabric. The relationships amongthe fiber properties such as fiber density, fiber diameter, fibrous material layer were considered as afactor that influences the sound absorption property.