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Novel aspects of micro-thermal analysis of polymer blends

Published online by Cambridge University Press:  02 July 2020

M. Conroy ,
H. M. Pollock ,
A. Hammiche ,
G. Mills ,
J.M.R. Weaver ,
M. Reading  and
D. M. Price
M. Conroy
Affiliation:
School of Physics and Chemistry, Lancaster University, Lancaster, LAI 4YB, UK
H. M. Pollock
Affiliation:
School of Physics and Chemistry, Lancaster University, Lancaster, LAI 4YB, UK
A. Hammiche
Affiliation:
School of Physics and Chemistry, Lancaster University, Lancaster, LAI 4YB, UK
G. Mills
Affiliation:
Department of Electronics and Electrical Engineering, GlasgowG12 8LT
J.M.R. Weaver
Affiliation:
Department of Electronics and Electrical Engineering, GlasgowG12 8LT
M. Reading
Affiliation:
IPTME, Loughborough University, LoughboroughLE11 3TU
D. M. Price
Affiliation:
IPTME, Loughborough University, LoughboroughLE11 3TU
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Extract

In “ac” scanning thermal microscopy, an “active” thermal probe is used also as a heater, so as to inject evanescent temperature waves into a sample and to allow sub-surface imaging of polymers and other materials [1]. The sub-surface detail detected corresponds to variations in heat capacity or thermal conductivity. By suitably choosing the temperature modulation frequency, and hence the penetration depth of the wave, we control the depth of material below the sample surface that is contributing to the image.

Micro-Thermal Analysis [2, 3] builds upon this technique, in order to add spatial resolution to two well-established methods of chemical fingerprinting, DTA and DMA. In both cases, a temperature ramp is used to subject the sample to “events” such as a glass transition or melting. The chief advantages of using the active thermal probe to provide the temperature ramp as well as the modulation, without the use of a heating stage, are: (a) the data are obtained from localised regions chosen from a previously-obtained thermal image, (b) apart from these regions, the rest of the sample is preserved in its original unheated state.

Type
Scanned Probe Microscopy: Much More Than Just Beautiful Images
Information
Microscopy and Microanalysis , Volume 5 , Issue S2: Proceedings: Microscopy & Microanalysis '99, Microscopy Society of America 57th Annual Meeting, Microbeam Analysis Society 33rd Annual Meeting, Portland, Oregon August 1-5, 1999 , August 1999 , pp. 980 - 981
Copyright
Copyright © Microscopy Society of America

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References

1. “Scanning thermal microscopy: sub-surface imaging, thermal mapping of polymer blends, localised calorimetry', Hammiche, A, Pollock, H M, Hourston, D J, Reading, M and Song, M, J Vac Sci Technol B14 (1996) 1486–1491.CrossRefGoogle Scholar

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5. “Generic scanned-probe microscope sensing by combining micromachining and electron beam lithography”, Zhou, H, Midha, A, Mills, G, Thorns, S, Murad, S K and Weaver, J M R, J Vac Sci Technol B16, 54–58 (1998)CrossRefGoogle Scholar