A tensile test technique for the freestanding PMMA thin films

Bae, Jong-Sung; Oh, Chung-Seog; Nam, Jung Eun; Lee, J.-K.; Lee, H.-J.

doi:10.1016/j.cap.2008.08.029

Cited by 19 publications

(10 citation statements)

References 3 publications

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“…A tensile test was selected to acquire the stress−strain data to determine certain mechanical properties of the free-standing films. 73 Shown in Figures 5a and 5b are the tensile moduli with S2), and were also similar to other PSU-based films reported in the literature. 21 As P(BA-a) is introduced in the α,ω-PSU(OH) 2 series, the tensile modulus remains within error of the parent α,ω-PSU(OH) 2 but shows significant decrease in the sampleto-sample reproducibility, as observed by the increase in the tensile modulus error (Figure 5c).…”

Section: ■ Results and Discussionsupporting

confidence: 83%

“…Atomic force microscopy (AFM) of the step height from the film to the exposed glass substrate gave film thickness values between 1.5 and 7 μm (Figure S5, Tables S3 and S4) used for the normalization of the mechanical properties (see Table S2) and UV–vis absorption data. A tensile test was selected to acquire the stress–strain data to determine certain mechanical properties of the free-standing films . Shown in Figures a and b are the tensile moduli with 95% confidence intervals ( n = 3) of the PSU-rich films for the P(BA-a)-containing α,ω-PSU(OH) 2 and α,ω-PSU(OTs) 2 series, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Improved Resilience and Uniformity in Polysulfone Blends from an Accelerated Grafting Ring-Opening Polymerization Reaction with Benzoxazine

et al. 2021

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BPA-based benzoxazine monomer (BA-a) solubilized in end-group ditosylated poly(ether sulfone) [α,ω-PSU(OTs) 2 ] undergoes an accelerated grafting ring-opening polymerization (ROP) to afford unique graft copolymer hybrids with predictable thermal properties and improved uniformity and superior mechanical properties. The α,ω-PSU(OTs) 2 was synthesized from the parent α,ω-dihydroxy poly(ether sulfone) with the conversion of end-groups quantified by 1 H NMR and GPC. The two polymers were used to create two blend series with a BPA-based benzoxazine monomer (BA-a) and heated to the polybenzoxazine-based products. The grafting ROP reaction of tosylated poly(ether sulfone) with the resulting polybenzoxazine network was studied by using DSC, FT-IR, SEM, and UV−vis and indicated that tosylated end-groups accelerate BA-a polymerization and afford products that are composed of P(BA-a)-graft-PSU with excess but well-mixed PSU. The approach allows for the fabrication of free-standing films that had higher tensile modulus, greater resiliency, and less mechanical property variation compared to their α,ω-dihydroxy poly(ether sulfone) analogues. The properties of the tosylated poly(ether sulfone) blend films and the accelerated cure of included benzoxazine allowed for the preparation of thin films on millimeter-scaled metal rods where the mechanically robust films do not undergo significant melt flow when cured by inductive heating.

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Section: ■ Results and Discussionsupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Improved Resilience and Uniformity in Polysulfone Blends from an Accelerated Grafting Ring-Opening Polymerization Reaction with Benzoxazine

et al. 2021

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“…The support rings get mounted and hermetically sealed to the PMMA layer using UV-initiated glue which we tested to be process compatible (lithography, assembly), long-term (3 months and more) operations compatible (electrolyte immersion), and biocompatible. The individual support rings each with a micropatterned PMMA layer attached are released by capillary forces from the silicon when soaked in de-ionized water containing a drop of surfacetant to decrease surface tension similar to the procedure recently published by Bae group in 2009 [22]. The water temperature is cycled between 80˚C (well below the glass transition temperature of PMMA; T G > 100˚C) for 10 minutes and room-temperature to facilitate capillary release by gentle thermal expansion.…”

Section: Electron-beam-based Sub-micron-sized Poresmentioning

confidence: 99%

PMMA Polymer Membrane-Based Single Cylindrical Submicron Pores: Electrical Characterization and Investigation of Their Applicability in Resistive-Pulse Biomolecule Detection

Achenbach¹,

Hashemi²,

Moazed³

et al. 2012

AJAC

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Single cylindrical submicron pores in PMMA polymer membranes are micropatterned by electron beam lithography and integrated into all PMMA-based electrophoretic flow detector systems. Pore dimensions are 450 nm in diameter and 1 μm in length. The pores are electrically characterized in aqueous KCl electrolyte, exhibiting a stable time-independent ionic current through the pore with a noise level of less than 1% of the open-pore current. The current-voltage curves are linear and scale with electrolyte concentration. The negative surface charge of the membrane over-proportionally decreases pore conductance at low electrolyte concentrations (≤0.1 M) that are still beyond those typically applied in biological experiments. Pores do not exhibit rectification of current flowing through them, allowing for operation with either polarity. To allow for detection of yet much smaller particles, the described PMMA-based system also was successfully equipped with pores of 1.5 nm instead of 450 nm in diameter. This was achieved by introducing naturally occurring biological protein pores of α-hemolysin on a lipid bi-layer into the pre-patterned PMMA membrane of an assembled PMMA-based electrophoretic flow detector system. Characteristics of translocation events of single-stranded linear plasmid DNA molecules through the pores were recorded, and ionic current deductions during biomolecule translocation were clear and distinguished. Based on the presented submicron scale open pore ionic current transport properties, as well as the observed passage of DNA molecules through protein pores inserted into PMMA membranes, our current research proposes that all PMMA electrophoretic flow detectors exhibit an excellent potential for future use as biomedical resistive-pulse sensors, as long as pore dimensions match those of biomolecules to be detected.

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“…17 In this scenario, the use of tensile tests appears as the most straightforward approach to deeply investigate both elastic and plastic mechanical behavior of materials even at the nanoscale. 18 Since the handling of a completely freestanding polymer film with less than 300 nm is extremely difficult, most of the tensile testing devices reported in the literature rely on the presence of a water layer to support the polymer film during testing. 7,19 Nevertheless, the liquid layer can play a role in the observed polymer behavior.…”

Section: Introductionmentioning

confidence: 99%

“…However, most of them rely on an indirect estimation of the mechanical properties, which is based on the application of analytical models relying on assumptions, require a supporting substrate, and do not enable a full understanding of the mechanical behavior of specimens, including failure processes . In this scenario, the use of tensile tests appears as the most straightforward approach to deeply investigate both elastic and plastic mechanical behavior of materials even at the nanoscale . Since the handling of a completely freestanding polymer film with less than 300 nm is extremely difficult, most of the tensile testing devices reported in the literature rely on the presence of a water layer to support the polymer film during testing. , Nevertheless, the liquid layer can play a role in the observed polymer behavior …”

Section: Introductionmentioning

confidence: 99%

Highly Deformable, Ultrathin Large-Area Poly(methyl methacrylate) Films

et al. 2021

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Poly(methyl methacrylate) (PMMA) is a glassy engineering polymer that finds extensive use in a number of applications. Over the past decade, thin films of PMMA were combined with graphene or other two-dimensional materials for applications in the area of nanotechnology. However, the effect of size upon the mechanical behavior of this thermoplastic polymer has not been fully examined. In this work, we adopted a homemade nanomechanical device to assess the yielding and fracture characteristics of freestanding, ultrathin (180−280 nm) PMMA films of a loaded area as large as 0.3 mm 2 . The measured values of Young's modulus and yield strength were found to be broadly similar to those measured in the bulk, but in contrast, all specimens exhibited a quite surprisingly high strain at failure (>20%). Detailed optical examination of the specimens during tensile loading showed clear evidence of craze development which however did not lead to premature fracture. This work may pave the way for the development of glassy thermoplastic films with high ductility at ambient temperatures.

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A tensile test technique for the freestanding PMMA thin films

Cited by 19 publications

References 3 publications

Improved Resilience and Uniformity in Polysulfone Blends from an Accelerated Grafting Ring-Opening Polymerization Reaction with Benzoxazine

Improved Resilience and Uniformity in Polysulfone Blends from an Accelerated Grafting Ring-Opening Polymerization Reaction with Benzoxazine

PMMA Polymer Membrane-Based Single Cylindrical Submicron Pores: Electrical Characterization and Investigation of Their Applicability in Resistive-Pulse Biomolecule Detection

Highly Deformable, Ultrathin Large-Area Poly(methyl methacrylate) Films

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