Preparation and acoustic properties of a tung oleic acid‐based polyurethane foam and its stratified structure

2020 ◽  
Vol 31 (12) ◽  
pp. 3020-3031
Author(s):  
Yangjie Ji ◽  
Shuming Chen
Keyword(s):  
Oleic Acid ◽  
Polyurethane Foam ◽  
Acoustic Properties ◽  
Stratified Structure

Assessment of the Acoustic Properties in Octavo Bands for Selected Polyurethane Materials

2016 ◽  
Vol 246 ◽  
pp. 7-10
Author(s):  
Tomasz Małysa ◽  
Krzysztof Nowacki ◽  
Teresa Lis
Keyword(s):  
Polyurethane Foam ◽  
Sound Absorption ◽  
Acoustic Properties ◽  
Frequency Range ◽  
Absorption Coefficients ◽  
Impedance Tube

The article presents the acoustic properties of selected polyurethane materials. The study involved a porous polyurethane foam primary and secondary, for whom assigned the value of sound absorption coefficients in the frequency range of 100 – 1250 Hz. The study was conducted in impedance tube Kundt.

scholarly journals Synthesis and Acoustic Study of a New Tung Oil-Based Polyurethane Composite Foam with the Addition of Miscanthus Lutarioriparius

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1144 ◽  
Author(s):  
Yangjie Ji ◽  
Shuming Chen ◽  
Yabing Cheng
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Foam ◽  
Transmission Loss ◽  
Polyurethane Foams ◽  
Acoustic Properties ◽  
Composite Foam ◽  
Tung Oil ◽  
Acoustic Performance ◽  
Miscanthus Lutarioriparius ◽  
Polyurethane Composite

Polyurethane foam is commonly used in the automobile industry due to its favorable acoustic performances. In this study, a new tung oil-based polyurethane composite foam (TOPUF) was prepared by a one-step method. Different forms and contents of miscanthus lutarioriparius (ML) were used in TOPUF for improving acoustic performance. Polyurethane foams were characterized by means of Fourier transform infrared and SEM. The acoustic properties and mechanical properties of TOPUF, obtained with ML, were determined and compared with pure petroleum-based polyurethane foam. The results illustrate that the modification of TOPUF with the ML has a positive effect on the acoustic and mechanical properties in comparison to the unmodified foam. TOPUF obtained with ML powders has better acoustic performance than that obtained with ML strips. The optimum acoustic performance is achieved at the filler content of 0.3 wt%. The average sound absorption coefficient and transmission loss can reach 0.518, and 19.05 dB, respectively.

scholarly journals In situ immobilization of commercial lipase in rigid polyurethane foam and application in the esterification of geraniol and oleic acid

2017 ◽  
Vol 8 (4) ◽  
pp. 57
Author(s):  
Ilizandra Aparecida Fernandes ◽  
Juliana Da Silva Zanatta ◽  
Diane Rigo ◽  
Nádia Ligianara Dewes Nyari ◽  
Jamile Zeni ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Polyurethane Foam ◽  
Rigid Polyurethane Foam ◽  
In Situ Immobilization ◽  
Commercial Lipase

A magnetic super lattice

1987 ◽  
Vol 45 ◽  
pp. 360-361 ◽  
Author(s):  
M.D. Bentzon ◽  
J. v. Wonterghem ◽  
A. Thölén
Keyword(s):  
Thermal Decomposition ◽  
Oleic Acid ◽  
Magnetic Fluid ◽  
Magnetic Particles ◽  
Carbon Film ◽  
Thick Layer ◽  
Amorphous Iron ◽  
Super Lattice ◽  
Carrier Liquid ◽  
Median Diameter

We report on the oxidation of a magnetic fluid. The oxidation results in magnetic super lattice crystals. The “atoms” are hematite (α-Fe2O3) particles with a diameter ø = 6.9 nm and they are covered with a 1-2 nm thick layer of surfactant molecules.Magnetic fluids are homogeneous suspensions of small magnetic particles in a carrier liquid. To prevent agglomeration, the particles are coated with surfactant molecules. The magnetic fluid studied in this work was produced by thermal decomposition of Fe(CO)5 in Declin (carrier liquid) in the presence of oleic acid (surfactant). The magnetic particles consist of an amorphous iron-carbon alloy. For TEM investigation a droplet of the fluid was added to benzine and a carbon film on a copper net was immersed. When exposed to air the sample starts burning. The oxidation and electron irradiation transform the magnetic particles into hematite (α-Fe2O3) particles with a median diameter ø = 6.9 nm.

Acoustic Properties of Artifical Larnyx Speech

1988 ◽  
Vol 16 ◽  
pp. 31-39
Author(s):  
Bethann Moffet ◽  
Rebekah Pindzola
Keyword(s):  
Acoustic Properties

Intestinal Absorption of Iodine131-Labeled Triolein and Oleic Acid in Normal Subjects and in Steatorrhea

1958 ◽  
Vol 34 (5) ◽  
pp. 901-909 ◽  
Author(s):  
Ervin Kaplan ◽  
Bernard D. Edidin ◽  
Robert C. Fruin ◽  
Lyle A. Baker
Keyword(s):  
Oleic Acid ◽  
Intestinal Absorption ◽  
Normal Subjects
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