Dynamic mechanical and ultrasonic properties of polyurea

Jing Qiao; Alireza V. Amirkhizi; Kristin Schaaf; Sia Nemat-Nasser; Gaohui Wu

doi:10.1016/j.mechmat.2011.06.012

Dynamic mechanical and ultrasonic properties of polyurea

Jing Qiao^*
, Alireza V. Amirkhizi
, Kristin Schaaf
, Sia Nemat-Nasser
, Gaohui Wu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

109 Scopus citations

Abstract

Dynamic mechanical analysis (DMA) and ultrasonic measurements were carried out to study the temperature and frequency dependences of viscoelastic properties of polyurea. Master curves of Young's storage and loss moduli were developed from the DMA data. Relaxation spectra were subsequently calculated by means of two approximate models, and the apparent activation energy of molecular rearrangements was also determined based on the temperature dependence of the time-temperature shift factor. Velocity and attenuation of longitudinal and shear ultrasonic waves in polyurea were measured in the 0.5-2 MHz frequency range between -60 and 30 °C temperatures. The complex longitudinal and shear moduli were computed from these measurements. Combining these results provided an estimate of the complex bulk and Young's moduli at high frequencies. The results of the DMA and temperature and frequency shifted ultrasonic measurements are compared and similarities and deviations are discussed.

Original language	English
Pages (from-to)	598-607
Number of pages	10
Journal	Mechanics of Materials
Volume	43
Issue number	10
DOIs	https://doi.org/10.1016/j.mechmat.2011.06.012
State	Published - Oct 2011
Externally published	Yes

Keywords

Mechanical properties
Polyurea
Time-temperature superposition

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10.1016/j.mechmat.2011.06.012

Cite this

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title = "Dynamic mechanical and ultrasonic properties of polyurea",

abstract = "Dynamic mechanical analysis (DMA) and ultrasonic measurements were carried out to study the temperature and frequency dependences of viscoelastic properties of polyurea. Master curves of Young's storage and loss moduli were developed from the DMA data. Relaxation spectra were subsequently calculated by means of two approximate models, and the apparent activation energy of molecular rearrangements was also determined based on the temperature dependence of the time-temperature shift factor. Velocity and attenuation of longitudinal and shear ultrasonic waves in polyurea were measured in the 0.5-2 MHz frequency range between -60 and 30 °C temperatures. The complex longitudinal and shear moduli were computed from these measurements. Combining these results provided an estimate of the complex bulk and Young's moduli at high frequencies. The results of the DMA and temperature and frequency shifted ultrasonic measurements are compared and similarities and deviations are discussed.",

keywords = "Mechanical properties, Polyurea, Time-temperature superposition",

author = "Jing Qiao and Amirkhizi, \{Alireza V.\} and Kristin Schaaf and Sia Nemat-Nasser and Gaohui Wu",

year = "2011",

month = oct,

doi = "10.1016/j.mechmat.2011.06.012",

language = "英语",

volume = "43",

pages = "598--607",

journal = "Mechanics of Materials",

issn = "0167-6636",

publisher = "Elsevier B.V.",

number = "10",

}

TY - JOUR

T1 - Dynamic mechanical and ultrasonic properties of polyurea

AU - Qiao, Jing

AU - Amirkhizi, Alireza V.

AU - Schaaf, Kristin

AU - Nemat-Nasser, Sia

AU - Wu, Gaohui

PY - 2011/10

Y1 - 2011/10

N2 - Dynamic mechanical analysis (DMA) and ultrasonic measurements were carried out to study the temperature and frequency dependences of viscoelastic properties of polyurea. Master curves of Young's storage and loss moduli were developed from the DMA data. Relaxation spectra were subsequently calculated by means of two approximate models, and the apparent activation energy of molecular rearrangements was also determined based on the temperature dependence of the time-temperature shift factor. Velocity and attenuation of longitudinal and shear ultrasonic waves in polyurea were measured in the 0.5-2 MHz frequency range between -60 and 30 °C temperatures. The complex longitudinal and shear moduli were computed from these measurements. Combining these results provided an estimate of the complex bulk and Young's moduli at high frequencies. The results of the DMA and temperature and frequency shifted ultrasonic measurements are compared and similarities and deviations are discussed.

AB - Dynamic mechanical analysis (DMA) and ultrasonic measurements were carried out to study the temperature and frequency dependences of viscoelastic properties of polyurea. Master curves of Young's storage and loss moduli were developed from the DMA data. Relaxation spectra were subsequently calculated by means of two approximate models, and the apparent activation energy of molecular rearrangements was also determined based on the temperature dependence of the time-temperature shift factor. Velocity and attenuation of longitudinal and shear ultrasonic waves in polyurea were measured in the 0.5-2 MHz frequency range between -60 and 30 °C temperatures. The complex longitudinal and shear moduli were computed from these measurements. Combining these results provided an estimate of the complex bulk and Young's moduli at high frequencies. The results of the DMA and temperature and frequency shifted ultrasonic measurements are compared and similarities and deviations are discussed.

KW - Mechanical properties

KW - Polyurea

KW - Time-temperature superposition

UR - https://www.scopus.com/pages/publications/80051581650

U2 - 10.1016/j.mechmat.2011.06.012

DO - 10.1016/j.mechmat.2011.06.012

M3 - 文章

AN - SCOPUS:80051581650

SN - 0167-6636

VL - 43

SP - 598

EP - 607

JO - Mechanics of Materials

JF - Mechanics of Materials

IS - 10

ER -

Dynamic mechanical and ultrasonic properties of polyurea

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Keywords

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