The anisotropic thermal expansivity of oriented Perspex

Wilson, J. D.; Treloar, L. R. G.

doi:10.1088/0022-3727/5/9/317

Cited by 12 publications

(3 citation statements)

References 4 publications

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“…We emphasize the impact of the CTE anisotropy by comparing the anisotropic and isotropic CTE best-fit cases in the blue solid and dashed lines, respectively, as shown in Figure . Assuming isotropic characteristics, the CTE is estimated to be 17.30 × 10 –6 ± 1.60 × 10 –6 K –1 , which is comparable to that with a similar molecular weight, ranging from ∼55 × 10 –6 to ∼100 × 10 –6 K –1 for bulk , and thin films. ,,, The out-of-plane CTE, in-plane CTE, and CTE anisotropy of thin PMMA film are estimated to be 1.48 × 10 –6 ± 0.13 × 10 –6 K –1 , 29.90 × 10 –6 ± 2.60 × 10 –6 K –1 , and 0.050 ± 0.002, respectively. The best-fit anisotropic CTE with R 2 of ∼0.97 shows a reasonable match with the experimental data within the measurement uncertainty, while the best-fit for isotropic CTE only shows R 2 of ∼0.73.…”

Section: Resultsmentioning

confidence: 91%

“…Assuming isotropic characteristics, the CTE is estimated to be 17.30 × 10 −6 ± 1.60 × 10 −6 K −1 , which is comparable to that with a similar molecular weight, ranging from ∼55 × 10 −6 to ∼100 × 10 −6 K −1 for bulk 38,39 and thin films. 24,29,34,40 The outof-plane CTE, in-plane CTE, and CTE anisotropy of thin PMMA film are estimated to be 1.48 × 10 −6 ± 0.13 × 10 −6 K −1 , 29.90 × 10 −6 ± 2.60 × 10 −6 K −1 , and 0.050 ± 0.002, respectively.…”

Section: Resultsmentioning

confidence: 92%

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Observation of Highly Anisotropic Thermal Expansion of Polymer Films

Chaikasetsin

Jung

Kim

et al. 2023

ACS Appl. Mater. Interfaces

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While dimensional change under thermal loading dictates various device failure mechanisms in soft materials, the interplay between microstructures and thermal expansion remains underexplored. Here, we develop a novel method to directly probe the thermal expansion for nanoscale polymer films using an atomic force microscope as well as confining active thermal volume. In a model system, spin-coated poly(methyl methacrylate), we find that the in-plane thermal expansion is enhanced by 20-fold compared to that along the out-of-plane directions in confined dimensions. Our molecular dynamics simulations show that the collective motion of side groups along backbone chains uniquely drives the enhancement of thermal expansion anisotropy of polymers in the nanoscale limit. This work unveils the intimate role of the microstructure of polymer films on its thermal−mechanical interaction, paving a route to judiciously enhance the reliability in a broad range of thin-film devices.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 92%

Observation of Highly Anisotropic Thermal Expansion of Polymer Films

Chaikasetsin

Jung

Kim

et al. 2023

ACS Appl. Mater. Interfaces

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“…Swelling experiments were carried out with the thermal expansion apparatus which has been used before with composites (6,7), and which is fully described in reference (8). The apparatus was modified and adapted to measure swelling strains as described schematically in Fig.…”

Section: Methodsmentioning

confidence: 99%

Swelling and hygroelasticiiy of polymeric composites

Marom¹

1977

Polymer Engineering & Sci

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Investigated are the swelling and hygroelasticity of a unidirectional glass fiber-reinforced epoxy composite subjected to boiling water for 24 hrs. By analogy with thermoelasticity, a coefficient of hygroelasticity is defined and shown to be predictable from the coefficients of the constituent materials by Schapery's equations. A mechanism for water penetration into the composite which combines capillarity and diffusion is proposed on the basis of the results of the water take-up as a function of the composite specimen width (fiber length).

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The thermoelastic effect in glassy polymers

Gilmour

Trainor

Haward

1978

J. Polym. Sci. Polym. Phys. Ed.

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The thermoelastic effect has been measured in compression on four glassy polymers; namely, polystyrene, poly(methyl methacrylate), polycarbonate, and epoxy resin. Quantitative results have been obtained for the first time on three of these polymers. It has been shown that by paying attention to specimen geometry and instrumentation results can be obtained to a high degree of accuracy (better than ±1.5% on a given set of measurements). The polymers are shown to obey the classical Thompson equation for thermoelasticity in solids over the temperature range studied (ca. 220–350°K). By inference such materials can be expected to behave classically in general. The results have been used, as first suggested by Trainor and Haward, to obtain values for the linear thermal expansion coefficient and the values so obtained are shown to be in excellent agreement, in general, with literature values obtained by more conventional methods. Results are given for a range of stress from 5 MN m−2 to between 25 and 50 MN m−2 according to ambient temperature. The method affords a measurement of parameters, in particular, linear thermal expansion coefficient. Values of specific heat for the four plastics have been measured by differential scanning calorimetry and the results compared with published data.

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The anisotropic thermal expansivity of oriented Perspex

Cited by 12 publications

References 4 publications

Observation of Highly Anisotropic Thermal Expansion of Polymer Films

Observation of Highly Anisotropic Thermal Expansion of Polymer Films

Swelling and hygroelasticiiy of polymeric composites

The thermoelastic effect in glassy polymers

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