The Effect of Polyester Structures on the Damping Property of Polyurethane Elastomers

Polyurethane elastomers (PU) based on polyester, TDI-100 and MOCA were synthesized by two step method. The polyurethane elastomers were investigated by infrared spectroscopy (FTIR), atomic force microscope (AFM) and dynamic thermal mechanical analyses (DMA). The results show that the structure of polyester plays an important role in polyurethane damping materials. When the polyester contains more side methyl groups, the polyurethane material has high damping properties (tan δ) and wide damping zones. So the polyurethane damping property can be improved by choosing polyester with appropriate structure.

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Measurement of the loss tangent of a thin polymeric film using the atomic force microscope

Journal of Materials Research ◽

10.1557/jmr.2004.19.1.387 ◽

2004 ◽

Vol 19 (1) ◽

pp. 387-395 ◽

Cited By ~ 18

Author(s):

P.M. McGuiggan ◽

D.J. Yarusso

Keyword(s):

Atomic Force Microscope ◽

Loss Tangent ◽

Oscillation Amplitude ◽

Polymer Surface ◽

Pressure Sensitive Adhesive ◽

Force Microscopy ◽

Atomic Force ◽

Microscopy Measurement ◽

Microscope Technique ◽

Tan Δ

An atomic force microscope was used to measure the loss tangent, tan δ, of a pressure-sensitive adhesive transfer tape as a function of frequency (0.01 to 10 Hz). For the measurement, the sample was oscillated normal to the surface and the response of the cantilever resting on the polymer surface (as measured via the photodiode) was monitored. Both oscillation amplitude and phase were recorded as a function of frequency. The atomic force microscopy measurement gave the same frequency dependence of tan δ as that measured by a dynamic shear rheometer on a film 20 times thicker. The results demonstrate that the atomic force microscope technique can quantitatively measure rheological properties of soft thin polymeric films.

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Preparation and intermolecular interaction of bio-based elastomer/hindered phenol hybrid with tunable damping properties

Pure and Applied Chemistry ◽

10.1515/pac-2014-1207 ◽

2015 ◽

Vol 87 (8) ◽

pp. 767-777 ◽

Cited By ~ 4

Author(s):

Xinxin Zhou ◽

Lesi Cai ◽

Weiwei Lei ◽

He Qiao ◽

Chaohao Liu ◽

...

Keyword(s):

Intermolecular Interactions ◽

Room Temperature ◽

Damping Properties ◽

Preparation Stage ◽

Single Transition ◽

Microstructure Morphology ◽

Hindered Phenol ◽

Tan Δ ◽

Damping Materials ◽

Vulcanization Process

AbstractIn this research, crosslinked hybrids of a newly invented bio-based elastomer poly(di-isoamyl itaconate-co-isoprene) (PDII) and 3,9-bis[1,1-dimethyl-2{β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy}ethyl]-2,4,8,10-tetraoxaspiro[5,5]-undecane (AO-80) were designed and prepared by the mechanical kneading of the PDII/AO-80 hybrids at a temperature higher than the melting point of AO-80, followed by the crosslinking of PDII during the subsequent hot-pressing/vulcanization process. The microstructure, morphology, and mechanical properties of the hybrids were systematically investigated in each preparation stage by using DSC, FTIR, XRD, SEM, DMTA, and tensile testing. Part of the AO-80 molecules formed an AO-80-rich phase, but most of them dissolved in the PDII to form a very fine dispersion in amorphous form. The results of FTIR and DSC indicated that strong intermolecular interactions were formed between the PDII and the AO-80 molecules. Each PDII/AO-80 crosslinked hybrid showed a single transition with a higher glass transition temperature and significantly higher loss value (tan δ) than the neat PDII because of intermolecular interactions between the PDII and the AO-80 molecules. For instance, tan δ of PDII/AO-80 consisting of 100 phr AO-80 achieved 2.6 times as neat PDII. The PDII/AO-80 crosslinked hybrids with applicability at room temperature are potential bio-based damping materials for the future.

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Near-field infrared absorption of plasmonic semiconductor microparticles studied using atomic force microscope infrared spectroscopy

Applied Physics Letters ◽

10.1063/1.4802211 ◽

2013 ◽

Vol 102 (15) ◽

pp. 152110 ◽

Cited By ~ 22

Author(s):

Jonathan R. Felts ◽

Stephanie Law ◽

Christopher M. Roberts ◽

Viktor Podolskiy ◽

Daniel M. Wasserman ◽

...

Keyword(s):

Infrared Spectroscopy ◽

Atomic Force Microscope ◽

Infrared Absorption ◽

Near Field ◽

Atomic Force

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Improved atomic force microscope infrared spectroscopy for rapid nanometer-scale chemical identification

Nanotechnology ◽

10.1088/0957-4484/24/44/444007 ◽

2013 ◽

Vol 24 (44) ◽

pp. 444007 ◽

Cited By ~ 18

Author(s):

Hanna Cho ◽

Jonathan R Felts ◽

Min-Feng Yu ◽

Lawrence A Bergman ◽

Alexander F Vakakis ◽

...

Keyword(s):

Infrared Spectroscopy ◽

Atomic Force Microscope ◽

Nanometer Scale ◽

Chemical Identification ◽

Atomic Force

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Measuring individual carbon nanotubes and single graphene sheets using atomic force microscope infrared spectroscopy

Nanotechnology ◽

10.1088/1361-6528/aa7c23 ◽

2017 ◽

Vol 28 (35) ◽

pp. 355707 ◽

Cited By ~ 9

Author(s):

Matthew R Rosenberger ◽

Michael Cai Wang ◽

Xu Xie ◽

John A Rogers ◽

SungWoo Nam ◽

...

Keyword(s):

Carbon Nanotubes ◽

Infrared Spectroscopy ◽

Atomic Force Microscope ◽

Graphene Sheets ◽

Atomic Force

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Damping properties of para-phenylene terephthalamide pulps modified damping materials

Journal of Reinforced Plastics and Composites ◽

10.1177/0731684416673726 ◽

2016 ◽

Vol 36 (2) ◽

pp. 137-148 ◽

Cited By ~ 3

Author(s):

Baihua Yuan ◽

Meng Chen ◽

Yu Liu ◽

Shexu Zhao ◽

Heng Jiang

Keyword(s):

Mechanical Properties ◽

Loss Modulus ◽

Dynamic Mechanical Properties ◽

Vibration Damping ◽

Damping Properties ◽

Machine Direction ◽

Scanning Calorimetry ◽

Dynamic Mechanical ◽

Damping Property ◽

Damping Materials

A series of para-phenylene terephthalamide pulp modified damping materials were prepared. The dynamic mechanical properties, differential scanning calorimetry, vibration damping properties, vulcanization property, tensile strengths as well as scanning electron microscopy micrographs of the damping materials were studied theoretically and experimentally. The dynamic mechanical properties of para-phenylene terephthalamide pulp modified damping materials were also compared with aramid short-cut fiber, E-glass staple fiber and carbon fiber powder modified damping materials. The results showed that para-phenylene terephthalamide pulp modified damping materials exhibited the best damping property and highest modulus in comparison with the other types of fibers. The storage modulus ( E′), loss modulus ( E″) and tensile strength of the materials were all increased significantly with increasing pulp content, and this trend was significantly greater in machine direction rather than in cross-machine direction. The second, third and fourth modes modal loss factors (η) of the steel beams coated with para-phenylene terephthalamide pulp modified damping materials increased substantially up to a maximum, and then became stable with increasing pulp amount. The optimal η in machine direction was achieved as the mass ratio of butadiene-acrylonitrile rubber to para-phenylene terephthalamide pulp was 100:30. Excellent damping property was mainly attributed to the extremely high interfacial contact area which significantly improved the efficiency of energy dissipation of internal friction, interfacial sliding and dislocation motion between para-phenylene terephthalamide pulps and butadiene-acrylonitrile rubber chains. Since para-phenylene terephthalamide pulp modified damping materials offer a high E′, excellent vibration damping properties, broad damping temperature and frequency ranges, it is ideal for free-damping structures which are widely utilized in industrial vibration and noise control applications.

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