Application of holographic interference technique to mechanical studies of polymeric solids

Matsuoka, Shiro; Wallder, V. T.; Beauchamp, H. L.

doi:10.1002/pen.760110108

Cited by 3 publications

(1 citation statement)

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“…In this paper, we report the design, fabrication, and characterization of a high-speed optical humidity sensor that is based on nanoporous polymeric transmission gratings. The gratings are fabricated through a modified holographic, polymer-dispersed liquid crystal (H-PDLC) system [32,33]. This technique involves holographic interference patterning upon a traditional photopolymer mixed with a non-reactive solvent, making possible the rapid fabrication of transmission gratings of varying dimensions.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous polymeric transmission gratings for high-speed humidity sensing

Shi¹,

Hsiao²,

Huang³

2007

Nanotechnology

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Nanoporous polymeric transmission gratings are demonstrated to be an excellent platform for high-speed optical humidity sensing. The grating structures were fabricated with a modified holographic, polymer-dispersed liquid crystal (H-PDLC) system. The sensing mechanism was based on changes in the relative transmission associated with the adsorption and desorption of water vapour by nanopores. The spectral changes due to varying humidity levels were measured by a spectrometer and compared with the calculated results based on the coupled wave theory. When the relative humidity (RH) changed from 40% to 95%, the relative transmission at 475 nm increased from 6.3% to 46.6% and that at 702 nm increased from 4% to 64%; these results indicate the sensor's high sensitivity. In addition, the sensor demonstrated excellent reversibility and reproducibility over a large RH range (from 20% to 100% RH). Moreover, the response time of the sensor was measured to be less than 350 ms, making it suitable for many high-speed humidity-sensing applications.

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Section: Introductionmentioning

confidence: 99%

Nanoporous polymeric transmission gratings for high-speed humidity sensing

Shi¹,

Hsiao²,

Huang³

2007

Nanotechnology

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Structural interpretation of nonlinear viscoelasticity in polymeric solids

Matsuoka¹,

Bair²,

Aloisio³

1974

J. polym. sci., C Polym. symp.

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The mechanical relaxation time in a glassy polymer depends on the magnitude of strain. The stress relaxation modulus of a styrene acrylonitrile and polybutadiene composite system (ABS) was measured at strains ranging from 0.005 to 0.10. The relaxation time was observed to shorten by up to four orders of magnitude. In addition, a decrease in the elastic contribution to the modulus was observed. These two aspects of nonlinear viscoelasticity are interpreted in terms of the excess entropy and enthalpy associated with dilatation under strain, a crucial factor for ductile behavior and the formation of crazes. Up to 0.9 cal/g of the excess enthalpy associated with the stress‐induced dilatation is obtained from the differential scanning calorimetry study. As a corollary, brittle behavior following annealing is explained by the fact that it would take a greater magnitude of strain to regain a critical amount of excess enthalpy by the stress induced dilatation.

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