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Comparison of surface mechanical properties among linear and star polystyrenes: Surface softening and stiffening at different temperatures.

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Title: Comparison of surface mechanical properties among linear and star polystyrenes: Surface softening and stiffening at different temperatures.
Authors: Karim, Taskin B.1, McKenna, Gregory B.1 greg.mckenna@ttu.edu
Source: Polymer. Oct2013, Vol. 54 Issue 21, p5928-5935. 8p.
Subjects: Mechanical properties of polymers, Comparative studies, Surfaces (Technology), Polystyrene, Softening agents, Glass transition temperature, Alpha-methylstyrol, Atomic force microscopy
Abstract: In a previous study, we reported both surface softening and stiffening for poly(α-methylstyrene) (PαMS) over a temperature range from room temperature to 21 °C above the glass transition temperature (T g) using the spontaneous particle embedment technique. In the present study, we have explored the surface mechanical responses of a linear polystyrene (PS), a 3-arm star PS, and an 8-arm star PS emphasizing the range of temperature from T g −10 °C to T g +10 °C, similar to that in which the prior study had shown a transition from surface softening (increased mobility) to stiffening (decreased mobility). We used atomic force microscopy for particle embedment depth estimation and the isochronal form of the Lee and Radok (LR) model for surface compliance determination. We observed both surface softening and stiffening for the linear PS and 3-arm star PS for the studied temperature range. However, surface softening was observed at all temperatures in this study for the 8-arm star PS. The surface compliance results for the different PS molecular architectures are compared with those for the linear PαMS from the previous study. [ABSTRACT FROM AUTHOR]
Copyright of Polymer is the property of Elsevier B.V. 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.)
Database: Engineering Source
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DbLabel: Engineering Source
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  Data: In a previous study, we reported both surface softening and stiffening for poly(α-methylstyrene) (PαMS) over a temperature range from room temperature to 21 °C above the glass transition temperature (T g) using the spontaneous particle embedment technique. In the present study, we have explored the surface mechanical responses of a linear polystyrene (PS), a 3-arm star PS, and an 8-arm star PS emphasizing the range of temperature from T g −10 °C to T g +10 °C, similar to that in which the prior study had shown a transition from surface softening (increased mobility) to stiffening (decreased mobility). We used atomic force microscopy for particle embedment depth estimation and the isochronal form of the Lee and Radok (LR) model for surface compliance determination. We observed both surface softening and stiffening for the linear PS and 3-arm star PS for the studied temperature range. However, surface softening was observed at all temperatures in this study for the 8-arm star PS. The surface compliance results for the different PS molecular architectures are compared with those for the linear PαMS from the previous study. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Polymer is the property of Elsevier B.V. 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: 10.1016/j.polymer.2013.07.067
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      – Code: eng
        Text: English
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        PageCount: 8
        StartPage: 5928
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        Type: general
      – SubjectFull: Comparative studies
        Type: general
      – SubjectFull: Surfaces (Technology)
        Type: general
      – SubjectFull: Polystyrene
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      – SubjectFull: Softening agents
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      – SubjectFull: Glass transition temperature
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      – SubjectFull: Alpha-methylstyrol
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      – SubjectFull: Atomic force microscopy
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      – TitleFull: Comparison of surface mechanical properties among linear and star polystyrenes: Surface softening and stiffening at different temperatures.
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              Text: Oct2013
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