Stress relaxation of elastomers

Salem, Nabil; Watts, D.C.; Combe, E.C.

doi:10.1016/s0109-5641(87)80059-3

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…In case of vinyl polysiloxane impressions after 1 and 24 hours, deviation of the casts from the master model could be due to continued polymerization shrinkage and after 14 days there is slight expansion because putty material is more viscous form of elastomers which shows slightly greater stress relaxation than fluid materials. 4 Studies have also shown that there are stresses generated by retrieval of multiple pours from a stiff-putty system. 5 Tray adhesive was not in as close proximity to the surface of the abutment as in a custom tray.…”

Section: Discussionmentioning

confidence: 99%

Evaluation and Comparison of Dimensional Accuracy of Newly Introduced Elastomeric Impression Material using 3D Laser Scanners: An in vitro Study

Pandita

Jain

Yadav

et al. 2013

The Journal of Contemporary Dental Practice

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Section: Discussionmentioning

confidence: 99%

Evaluation and Comparison of Dimensional Accuracy of Newly Introduced Elastomeric Impression Material using 3D Laser Scanners: An in vitro Study

Pandita

Jain

Yadav

et al. 2013

The Journal of Contemporary Dental Practice

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“…11 However, previous literature mentioned a contradictory relationship between stress relaxation and recoverability (i.e., high stress relaxation leads to bad elasticity). 12 Therefore, it still remains a challenge to balance good stress relaxation and recoverability. In addition, low T g is necessary for CVF to work in a low-temperature environment (i.e., −20 to 80 °C9 ), as the glass transition temperature (T g ) determines the minimum working temperature.…”

Section: Introductionmentioning

confidence: 99%

“…In order to prevent fatigue-induced cracking and delamination during repeated folding and unfolding, it is crucial to ensure both high stretching ability and recoverability in the functional layers . However, previous literature mentioned a contradictory relationship between stress relaxation and recoverability (i.e., high stress relaxation leads to bad elasticity) . Therefore, it still remains a challenge to balance good stress relaxation and recoverability.…”

Section: Introductionmentioning

confidence: 99%

Clear Viscoelastic Film Based on Low-Hard-Segment Silicone Polyurea Elastomers for Flexible Display Applications

Qin,

Wang,

Xia

2024

ACS Appl. Polym. Mater.

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A clear viscoelastic film (CVF) plays a critical role in bonding different components in a display module. The recent flexible display application calls for a CVF with balanced viscoelasticity by integrating many combined material properties, such as high optical clarity, high adhesion, low glass transition temperature, low elastic modulus, and high recovery performance. In particular, a low glass transition temperature (T g ) is essential to achieve flexibility over a wide range of temperatures (i.e., −20 to 80 °C). Silicone polymers are an important class of elastomers with T g below −100 °C and are expected to exhibit unique properties as CVF candidates in flexible display applications. In this report, silicone polyurea (SPU) elastomers with low hard segments were fi r s t s y n t h e s i z e d u s i n g α , ω -b i s ( a m i n o p r o p y l ) p o l y -(dimethylsiloxanes) and different diisocyanates. Interestingly, these silicone polyurea elastomers exhibited good elasticity despite a small quantity of bidentate hydrogen bonds. SPU CVF was then prepared by blending tackifier that hydrolytic condensation products of monofunctional silane (M) and tetrafunctional silane (Q) (MQ resin) at different ratios to adjust the viscoelastic properties. Specifically, blending an equal weight of methyl MQ resin could simultaneously achieve an optimum balance of high clarity (transmittance above 94%, haze lower than 1%), low elastic modulus (30 kPa at room temperature), low working temperature limit (T g approximately −20 °C), decent peel adhesion (6.9 N/25 mm), good stress relaxation (71.43%), and high recovery (80%) at large strain (500 and 1000%). Moreover, the optimal sample could withstand 200 000 successive folding−unfolding tests without any cracking or delamination. The results revealed that the SPU-based viscoelastomers could function as CVFs for flexible display applications.

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“…Notably, recovery is defined as a restoring force of materials that depends on the change in entropy, which in turn relies on their molecular structure and length in accordance with the thermodynamics of rubber elasticity [14]. The term "relaxation" signifies that the stress applied in a system is relaxed through molecular motions, which in turn implies that the elongation of polymer chains or networks with low-crosslinking density (or percolation networks) vary with increasing entropy (i.e., less stress relaxation leads to higher elasticity) [15]. Thus, there is a tradeoff relationship between recovery and relaxation; therefore, achieving a highly optimized performance of PSAs with appropriate recovery and relaxation using conventional methods is a challenge.…”

Section: Introductionmentioning

confidence: 99%

Stretchable and recoverable acrylate-based pressure sensitive adhesives with high adhesion performance, optical clarity, and metal corrosion resistance

Lee

Park

Myung

et al. 2021

Chemical Engineering Journal

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In the era of the Internet of Things, digital displays play a critical role in human-machine interfaces. In particular, displays applied to contemporary devices such as flexible smart watches and foldable/rollable electronics underline the need for pertinent materials and device technologies to fulfill their designed functions. However, despite the technical advancements of electronic components such as stretchable/flexible electrodes and flexible backplanes, their proper assembly remains a challenge. Herein, we report the compositional effect of acrylic acid (AA) on the physical properties of as-synthesized pressure sensitive adhesives (PSAs), especially on their adhesion performance in terms of wettability and peel adhesion. Accordingly, an empirical criterion for intimate wetting is proposed based on the storage modulus of the PSAs. In this study, the PSA with the best adhesion performance was evaluated for its viscoelastic properties and suitability for specific applications. The results demonstrated the strain-dependent conformational recovery of the adhesive; the implementation of the prestrain strategy enables rapid strain reversibility at 25% of the total strain. Furthermore, the AA-incorporated PSAs exhibited remarkable metal corrosion resistance as well as high optical clarity. Thus, this fundamental study of stretchable PSAs can provide useful guidance for the development of advanced PSAs that can be used in a wide range of applications involving display devices.

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Stress relaxation of elastomers

Cited by 6 publications

References 4 publications

Evaluation and Comparison of Dimensional Accuracy of Newly Introduced Elastomeric Impression Material using 3D Laser Scanners: An in vitro Study

Evaluation and Comparison of Dimensional Accuracy of Newly Introduced Elastomeric Impression Material using 3D Laser Scanners: An in vitro Study

Clear Viscoelastic Film Based on Low-Hard-Segment Silicone Polyurea Elastomers for Flexible Display Applications

Stretchable and recoverable acrylate-based pressure sensitive adhesives with high adhesion performance, optical clarity, and metal corrosion resistance

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