Degradation mechanism of silicone glues under UV irradiation and options for designing materials with increased stability

Fischer, Hartmut; Semprimoschnig, Christopher; Mooney, C.; Rohr, Thomas; Eck, Ernst R. H. van; Verkuijlen, M.H.W.

doi:10.1016/j.polymdegradstab.2012.12.022

Cited by 42 publications

(40 citation statements)

References 22 publications

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“…These highly reactive radicals can undergo various reactions such as recombination, disproportionation, and hydrogen abstraction. It is proposed that photon absorption by unsaturated bonds formed in the material leads to further photochemical reactions and eventually to the degradation of the PDMS resin by causing several inter-and/or intramolecular rearrangements [12,13]. Consequently, improved UV stability might be accomplished by limiting the formation of uncontrolled species, which bring important degradations.…”

Section: Introductionmentioning

confidence: 99%

Polydimethylsiloxane/Additive Systems for Thermal and Ultraviolet Stability in Geostationary Environment

Planes¹,

Coz²,

Soum³

et al. 2016

Journal of Spacecraft and Rockets

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The development of radiation resistant materials is an ongoing challenge for space industry. High-energy irradiation (ultraviolet, electrons, neutrons, protons) induce damage to materials and electronic components in spaceships. Silicone resins are often used and play a key role as coatings and adhesive materials for satellites. Polydimethylsiloxanes show material exhaustion after long-term exposure to ultraviolet irradiation. Consequently, solutions are required to increase their thermo-and photostability under solar irradiation. Three different families of additives, namely ultraviolet absorbers, hindered amine light stabilizers, and a carbazole derivative are investigated. Those ultraviolet stabilizers were mixed with polydimethylsiloxane, then a cross-linking process was run by hydrosilylation. When ultraviolet absorbers could not be used due to a miscibility problem, addition of 0.5 wt % of bis (2,2,6,6-tetramethylpiperidin-4-yl)decanedioate (hindered amine light stabilizer 1) was shown to increase the thermal stability, measured by thermogravimetric analysis, from 360 to 395°C (Td 5%). Using visible near-infrared spectroscopy and after 450 equivalent solar hours of ultraviolet irradiation, an average increase of 2.6% in the ultraviolet stability was also obtained in the wavelength range from 250 to 400 nm. A polydimethylsiloxane/ dibromocarbazole 1.0 wt% did not improve the ultraviolet stability but exhibited a strong increase (about 100°C) of the degradation temperature of the polydimethylsiloxane.

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Section: Introductionmentioning

confidence: 99%

Polydimethylsiloxane/Additive Systems for Thermal and Ultraviolet Stability in Geostationary Environment

Planes¹,

Coz²,

Soum³

et al. 2016

Journal of Spacecraft and Rockets

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show abstract

“…Organic vehicle, such as resin or silicone, is a common option, but is known notoriously for its poor physical/chemical stability. Especially, the long‐term repeatable UV‐laser write‐in process would cause slight shrinkage, visible colouration, coupled with an increase in brittleness . Alternatively, inorganic glass appears to be an optimizing candidate, which has been proven effective for high‐power LED/LD applications .…”

Section: Resultsmentioning

confidence: 99%

A Photostimulated BaSi₂O₅:Eu²⁺,Nd³⁺ Phosphor‐in‐Glass for Erasable‐Rewritable Optical Storage Medium

Lin

Huang

et al. 2019

Laser & Photonics Reviews

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Up‐to‐date optical storage technology calls for large memory capacity, expanded storage dimension, rewritable capability, low cost, and high energy efficiency, which poses stringent requirements on the storage medium. In this study, a novel BaSi2O5:Eu2+,Nd3+ photostimulated luminescence (PSL) phosphor is developed and then made into phosphor‐in‐glass (PiG) storage medium. Upon ultraviolet light irradiation (write‐in), the generated electrons are captured by the traps, which can be further released by thermal or near‐infrared laser stimulation (read‐out). An insightful investigation is carried out to establish the relationship between trap properties and PSL performance. Demonstration application confirmed the intensity‐multiplexing optical information (including the designed bar code, quick response (QR) code, graphic patterns, and binary data) encoding/decoding. Remarkably, BaSi2O5:Eu2+,Nd3+ PSL PiG show excellent erasable‐rewritable capability thanking to the admirable anti‐ultraviolet property in glass host, as well as good optical data retention ability owing to the spatially isolated deep traps. Hopefully, the present work can push forward the research progress of PSL material and its practical application in optical storage.

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“…Ultraclear™ PU is an example of a UV-resistant PU that absorbs completely in the UV range. PDMS is also known to degrade under UV radiation without protective additives [50,51].…”

Section: Optical Claritymentioning

confidence: 99%

Characterization and Neutral Atom Beam Surface Modification of a Clear Castable Polyurethane for Biomicrofluidic Applications

et al. 2019

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Polyurethanes (PU) are a broad class of polymers that offer good solvent compatibility and a wide range of properties that can be used to generate microfluidic layers. Here, we report the first characterization of a commercially available Shore 80D polyurethane (Ultraclear™ 480N) for biomicrofluidic applications. Studies included comparing optical clarity with Polydimethylsiloxane (PDMS) and using high-fidelity replica molding to produce solid PU structures from the millimeter to nanometer scales. Additionally, we report the first use of NanoAccel™ treatment in Accelerated Neutral Atom Beam (ANAB) mode to permanently roughen the surface of PU and improve the adhesion of breast cancer cells (MDA-MB-231) on PU. Surface energy measurements using Owens-Wendt equations indicate an increase in polar and total surface energy due to ANAB treatment. Fourier-transform infrared (FTIR) spectroscopy in attenuated total reflectance (ATR) mode was used to demonstrate that the treatment does not introduce any new types of functional groups on the surface of Ultraclear™ PU. Finally, applicability in rapid prototyping for biomicrofluidics was demonstrated by utilizing a 3D-printing-based replica molding strategy to create PU microfluidic layers. These layers were sealed to polystyrene (PS) bases to produce PU-PS microfluidic chips. Ultraclear™ PU can serve as a clear and castable alternative to PDMS in biomicrofluidic studies.

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Degradation mechanism of silicone glues under UV irradiation and options for designing materials with increased stability

Cited by 42 publications

References 22 publications

Polydimethylsiloxane/Additive Systems for Thermal and Ultraviolet Stability in Geostationary Environment

Polydimethylsiloxane/Additive Systems for Thermal and Ultraviolet Stability in Geostationary Environment

A Photostimulated BaSi₂O₅:Eu²⁺,Nd³⁺ Phosphor‐in‐Glass for Erasable‐Rewritable Optical Storage Medium

Characterization and Neutral Atom Beam Surface Modification of a Clear Castable Polyurethane for Biomicrofluidic Applications

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Degradation mechanism of silicone glues under UV irradiation and options for designing materials with increased stability

Cited by 42 publications

References 22 publications

Polydimethylsiloxane/Additive Systems for Thermal and Ultraviolet Stability in Geostationary Environment

Polydimethylsiloxane/Additive Systems for Thermal and Ultraviolet Stability in Geostationary Environment

A Photostimulated BaSi2O5:Eu2+,Nd3+ Phosphor‐in‐Glass for Erasable‐Rewritable Optical Storage Medium

Characterization and Neutral Atom Beam Surface Modification of a Clear Castable Polyurethane for Biomicrofluidic Applications

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Product

Resources

About

A Photostimulated BaSi₂O₅:Eu²⁺,Nd³⁺ Phosphor‐in‐Glass for Erasable‐Rewritable Optical Storage Medium