Aging of silicone pressure-sensitive adhesives

Antosik, Adrian Krzysztof; Bednarczyk, Paulina; Czech, Zbigniew

doi:10.1007/s00289-017-2083-2

Cited by 41 publications

(25 citation statements)

References 21 publications

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“…This is exhibited in every formulation and throughout the interior of the samples, although the extent of discoloration is more pronounced in the modified specimen. The clear-to-yellow discoloration phenomenon of silicones is known to be caused by platinum–complex interactions and does not affect material performance [ 79 , 80 , 81 , 82 ]. Interestingly, all samples produce an obvious yellowing at 80 °C if they haven’t already been discolored.…”

Section: Resultsmentioning

confidence: 99%

Long-Term Thermal Aging of Modified Sylgard 184 Formulations

et al. 2021

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Primarily used as an encapsulant and soft adhesive, Sylgard 184 is an engineered, high-performance silicone polymer that has applications spanning microfluidics, microelectromechanical systems, mechanobiology, and protecting electronic and non-electronic devices and equipment. Despite its ubiquity, there are improvements to be considered, namely, decreasing its gel point at room temperature, understanding volatile gas products upon aging, and determining how material properties change over its lifespan. In this work, these aspects were investigated by incorporating well-defined compounds (the Ashby–Karstedt catalyst and tetrakis (dimethylsiloxy) silane) into Sylgard 184 to make modified formulations. As a result of these additions, the curing time at room temperature was accelerated, which allowed for Sylgard 184 to be useful within a much shorter time frame. Additionally, long-term thermal accelerated aging was performed on Sylgard 184 and its modifications in order to create predictive lifetime models for its volatile gas generation and material properties.

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Section: Resultsmentioning

confidence: 99%

Long-Term Thermal Aging of Modified Sylgard 184 Formulations

et al. 2021

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“…With increasing aging of the silicone PSA, low adhesion and tack were observed. However, aging did not affect the cohesion of the adhesive films at 20°C and 70°C [10]. 1) West Pomeranian University of Technology, Szczecin, Faculty of Chemical Technology and Engineering, Department of Chemical Organic Technology and Polymeric Materials, Pulaskiego 10, 70-322 Szczecin, Poland.…”

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confidence: 99%

Influence of storage time on the useful properties of silicone pressure-sensitive adhesives

Antosik

Mozelewska

2022

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The influence of the storage time on the useful properties (cohesion, adhesion, stickiness) of silicone pressure-sensitive tapes (Si-PSA) was investigated. Two types of silicone resins PSA 529 and PSA 590 (Momentive, USA) were used and crosslinked with bis (2,4-dichlorobenzoyl) peroxide (DClBPO). There was no significant effect of tapes long-term storage (7 years) on their properties. The tapes based on PSA 590 resin were more resistant to aging than PSA 529.

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“…An additional subset of polysiloxanes are the so-called siloxane- or silicone-resins, which are highly branched macromolecules composed of one or more primary silicone structural units, M (R 3 SiO 1/2 ), D (R 2 SiO 2/2 ), T (RSiO 3/2 ), and/or Q (SiO 4/2 ) (Scheme ). These materials are used in a broad range of applications, notably as damping agents in pressure-sensitive adhesives, − glossing or tackifying agents in cosmetic formulations, and notably, as reinforcing agents in siloxane elastomers. , While many different types of silicone-resins exist (MQ, MT, TD, T, MTQ, etc. ), we have focused our efforts specifically on characterizing vinyl-functionalized MQ-resins (named for their repeating “M” and “Q” structural units; Scheme a) incorporated into poly(dimethylsiloxane) (PDMS) elastomers.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Signatures of MQ-Resins in Silicone Elastomers

et al. 2021

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Polysiloxane elastomers have a large application space due to their versatile cross-linking chemistry and highly tunable physical and mechanical properties. One approach for improving the mechanical integrity of commercial polysiloxane “silicone” elastomers while maintaining their optical transparency is the addition of small, silicone-resin molecules to the network. However, both the poly(dimethylsiloxane) (PDMS) network and the silicone-resin particles have an amorphous structure and complex chemistry, which makes the characterization of their structural properties and segmental network dynamics difficult. Here, we report the synthesis and characterization of a series of model silicone networks modified with a specific class of silicone-resin known as MQ-resin using Raman and advanced nuclear magnetic resonance (NMR) spectroscopy methods. Raman spectroscopy was successfully used to quantify the contribution of the MQ-resin to the network, to determine the type of MQ-resin present in the network, and to investigate the completeness of the network cross-linking reaction. Solid-state and 1H double-quantum (DQ) NMR spectroscopies were used not only as a detection method for the MQ-resins but also to quantify changes in the segmental dynamics of the network as a function of MQ-resin concentration. The combination of Raman and NMR spectroscopies describes a series of samples where the MQ-resin particles and PDMS chains maintain their independent segmental dynamics up to high concentrations of MQ-resins (40–50% MQ), where the physical properties of the resin dominate the physical properties of the overall network. The results from our spectroscopic analyses are consistent with the results from macroscopic characterization techniques such as solvent uptake and mechanical testing. The spectroscopic insights into the structure–property relationships of PDMS-MQ composites presented in this study are a valuable tool not only for the synthesis and reverse engineering of future generations of commercial silicone elastomers but also for understanding the mechanisms of aging and degradation over the material lifetime.

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Aging of silicone pressure-sensitive adhesives

Cited by 41 publications

References 21 publications

Long-Term Thermal Aging of Modified Sylgard 184 Formulations

Long-Term Thermal Aging of Modified Sylgard 184 Formulations

Influence of storage time on the useful properties of silicone pressure-sensitive adhesives

Spectroscopic Signatures of MQ-Resins in Silicone Elastomers

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