Effect of isocyanate molecular structures in fabricating flexible polyurethane foams on sound absorption behavior

2016 ◽  
Vol 53 ◽  
pp. 156-164 ◽  
Author(s):  
Giwook Sung ◽  
Seok Kyuong Kim ◽  
Ji Wan Kim ◽  
Jung Hyeun Kim
Keyword(s):  
Sound Absorption ◽  
Polyurethane Foams ◽  
Molecular Structures ◽  
Flexible Polyurethane

scholarly journals The Effects of Various Additive Components on the Sound Absorption Performances of Polyurethane Foams

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Shuming Chen ◽  
Yang Jiang ◽  
Jing Chen ◽  
Dengfeng Wang
Keyword(s):  
Absorption Coefficient ◽  
Sound Absorption ◽  
Transmission Loss ◽  
Polyurethane Foams ◽  
Acoustic Properties ◽  
Acoustic Absorption ◽  
Absorption Properties ◽  
Maximum Enhancement ◽  
Flexible Polyurethane ◽  
Pu Foams

Flexible polyurethane (PU) foams comprising various additive components were synthesized to improve their acoustic performances. The purpose of this study was to investigate the effects of various additive components of the PU foams on the resultant sound absorption, which was characterized by the impedance tube technique to obtain the incident sound absorption coefficient and transmission loss. The maximum enhancement in the acoustic properties of the foams was obtained by adding fluorine-dichloroethane (141b) and triethanolamine. The results showed that the acoustic absorption properties of the PU foams were improved by adding 141b and triethanolamine and depended on the amount of the water, 141b, and triethanolamine.

scholarly journals Nitrogen/phosphorus synergistic flame retardant-filled flexible polyurethane foams: microstructure, compressive stress, sound absorption, and combustion resistance

RSC Advances ◽  
2019 ◽  
Vol 9 (37) ◽  
pp. 21192-21201 ◽  
Author(s):  
Ting-Ting Li ◽  
Mengfan Xing ◽  
Hongyang Wang ◽  
Shih-Yu Huang ◽  
Chengeng Fu ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Polyurethane Foam ◽  
Sound Absorption ◽  
Heat Insulation ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foam ◽  
Flexible Polyurethane Foam ◽  
Synergistic Flame Retardant ◽  
Flexible Polyurethane ◽  
Nitrogen Phosphorus

Compared with a rigid polyurethane foam, a flexible polyurethane foam (FPUF) has more diversified applications including filtration, sound absorption, vibration-proofing, decoration, packaging, and heat insulation.

Sound absorption performance of flexible polyurethane/silicon dioxide perforated coating composites

2021 ◽  
pp. 004051752110155
Author(s):  
Min Peng ◽  
Xiaoming Zhao ◽  
Weibin Li
Keyword(s):  
Silicon Dioxide ◽  
Sound Absorption ◽  
Woven Fabric ◽  
Perforation Rate ◽  
Cavity Depth ◽  
Resonant Frequencies ◽  
The Matrix ◽  
Absorption Performance ◽  
Traditional Sense ◽  
Flexible Polyurethane

Perforated materials in the traditional sense are rigid, usually dense, costly and inflexible. For this study, polyester/cotton blended woven fabric as the base fabric, nano-SiO2 (silicon dioxide) as the functional particles and PU (polyurethane) as the matrix were selected. Accordingly, flexible PU/SiO2 perforated coating composites with different process parameters were developed. The influence of the nano-SiO2 content, perforation diameter, perforation rate, number of fiber felt layers and cavity depth on the sound absorption coefficient were investigated. The resonant frequencies of materials with different cavity depths were evaluated by both theoretical calculation and experimental method. It was found that the flexible perforated composite has good sound absorption and mechanical properties, and has great potential for applications requiring soft and lightweight sound absorption materials.

Sign in / Sign up

Export Citation Format

Share Document