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Issue 14, 2017, Issue in Progress
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Thermomechanical analysis of picograms of polymers using a suspended microchannel cantilever

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Abstract

Microchannel cantilevers are an emerging platform for physical characterization of materials at the picogram level. Here we report on detecting multiple thermal transitions in picogram amounts of two well-known polymers, semicrystalline poly(L-lactide) (PLA) and amorphous poly(methylmethacrylate) (PMMA), using this platform. The polymer samples, when loaded inside the cantilever, affect its resonance frequency due to changes in its total mass and stiffness. When taken through a thermal cycle, the resonance response of the cantilever further changes due to multiple thermal transitions of the samples. Continuous monitoring of the resonance frequency provides information about β-transition (Tβ), glass transition (Tg), crystallization (Tc), and melting (Tm) of the confined polymer samples. The measured Tg, Tc, and Tm for PLA were ∼60, 78, and 154 °C, respectively, while the Tg and Tβ for PMMA were 48 and 100 °C, respectively. These results are in an agreement with the data obtained from differential scanning calorimetry (DSC). Because of its high sensitivity, this technique is capable of detecting the weaker β-transitions that cannot be observed with conventional DSC.

Graphical abstract: Thermomechanical analysis of picograms of polymers using a suspended microchannel cantilever

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Supplementary files

Article information


Submitted
19 Oct 2016
Accepted
17 Jan 2017
First published
24 Jan 2017

This article is Open Access

RSC Adv., 2017,7, 8415-8420
Article type
Paper

Thermomechanical analysis of picograms of polymers using a suspended microchannel cantilever

S. A. Manzoor Bukhari, M. F. Khan, A. Goswami, R. McGee and T. Thundat, RSC Adv., 2017, 7, 8415
DOI: 10.1039/C6RA25455A

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