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Unusual Surface MechanicalProperties of Poly(α-methylstyrene):Surface Softening and Stiffening at Different Temperatures.

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Title: Unusual Surface MechanicalProperties of Poly(α-methylstyrene):Surface Softening and Stiffening at Different Temperatures.
Authors: Karim, Taskin B.1, McKenna, Gregory B.1
Source: Macromolecules. Dec2012, Vol. 45 Issue 24, p9697-9706. 10p.
Subjects: Styrene, Mechanical behavior of materials, Surface chemistry, Temperature effect, Atomic force microscopy, Viscoelasticity
Abstract: We report results from experiments based on the spontaneousparticleembedment technique to determine the surface compliance of poly(α-methylstyrene)(PαMS) for temperatures from room temperature to Tg+ 21 °C. Both submicrometer and nanometer diameterparticles were investigated. Atomic force microscopy (AFM) measurementswere used for the particle embedment determination, and the Lee andRadok (LR) model was applied to calculate the surface shear compliancesusing the embedment depth of the particles for the temperatures ofinterest. The adhesion force between the particles and the PαMSwas used as the driving force for the embedment in the LR model calculation.Results were compared with macroscopic viscoelastic data for PαMSobtained from the literature and with new data from the present study.We observed surface softening for the PαMS in the temperaturerange from room temperature to Tg–21 °C. This was followed by a crossover to a surface mechanicalresponse that was stiffer than the macroscopic material for temperaturesfrom Tg– 18 °C to Tg+ 21 °C. These novel findings were observedfor both 199 and 60 nm diameter silica particles. [ABSTRACT FROM AUTHOR]
Copyright of Macromolecules is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Unusual Surface MechanicalProperties of Poly(α-methylstyrene):Surface Softening and Stiffening at Different Temperatures.
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  Data: <searchLink fieldCode="JN" term="%22Macromolecules%22">Macromolecules</searchLink>. Dec2012, Vol. 45 Issue 24, p9697-9706. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Styrene%22">Styrene</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+chemistry%22">Surface chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+effect%22">Temperature effect</searchLink><br /><searchLink fieldCode="DE" term="%22Atomic+force+microscopy%22">Atomic force microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Viscoelasticity%22">Viscoelasticity</searchLink>
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  Data: We report results from experiments based on the spontaneousparticleembedment technique to determine the surface compliance of poly(α-methylstyrene)(PαMS) for temperatures from room temperature to Tg+ 21 °C. Both submicrometer and nanometer diameterparticles were investigated. Atomic force microscopy (AFM) measurementswere used for the particle embedment determination, and the Lee andRadok (LR) model was applied to calculate the surface shear compliancesusing the embedment depth of the particles for the temperatures ofinterest. The adhesion force between the particles and the PαMSwas used as the driving force for the embedment in the LR model calculation.Results were compared with macroscopic viscoelastic data for PαMSobtained from the literature and with new data from the present study.We observed surface softening for the PαMS in the temperaturerange from room temperature to Tg–21 °C. This was followed by a crossover to a surface mechanicalresponse that was stiffer than the macroscopic material for temperaturesfrom Tg– 18 °C to Tg+ 21 °C. These novel findings were observedfor both 199 and 60 nm diameter silica particles. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Macromolecules is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1021/ma302192b
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      – Code: eng
        Text: English
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        PageCount: 10
        StartPage: 9697
    Subjects:
      – SubjectFull: Styrene
        Type: general
      – SubjectFull: Mechanical behavior of materials
        Type: general
      – SubjectFull: Surface chemistry
        Type: general
      – SubjectFull: Temperature effect
        Type: general
      – SubjectFull: Atomic force microscopy
        Type: general
      – SubjectFull: Viscoelasticity
        Type: general
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      – TitleFull: Unusual Surface MechanicalProperties of Poly(α-methylstyrene):Surface Softening and Stiffening at Different Temperatures.
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              Text: Dec2012
              Type: published
              Y: 2012
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