Reactive Functionally Terminated Polyorganosiloxanes

Pang, Yuanyuan; Koh, J. Justin; Liu, Yupeng; He, Chaobin

doi:10.1002/9783527823499.ch2

Cited by 4 publications

(3 citation statements)

References 221 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, toughness is enhanced 6.4 times merely by increasing the stretching speeds from 2 to 70 min –1 . The elongation at break is more than 9000% at a 70 min –1 stretching speed, which is 52 times larger than that of the commercial PDMS elastomer (Sylgard 184) and has surpassed the most reported PDMS-based elastomers. ,− At the initial stage of stretching, a sharp increment in engineering stress (stage I) can be observed, which corresponds to the elastic deformation. The slope then becomes gentler and a maximum appears (stage II).…”

Section: Resultsmentioning

confidence: 99%

Speed-Induced Extensibility Elastomers with Good Resilience and High Toughness

et al. 2021

Self Cite

View full text Add to dashboard Cite

The relationship between elongation at break of a material and stretching speed has always been known to be an inversed one. In this work, however, thermoplastic elastomers based on two thermodynamically immiscible components, poly(dimethylsiloxane) (PDMS) and poly(propylene glycol) (PPG), exhibit speed-induced extensibility (SIE). This leads to significant enhancement in Young’s modulus, strength, and elongation at break with increased stretching speed. As such, the system is capable of achieving elongation at break of more than 9000% at a 70 min–1 stretching speed and excellent notch resistance such that the strain and the fracture energy of the notched specimen can reach up to ∼2000% and ∼53,600 J/m2, respectively, surpassing the most reported PDMS-based elastomers. The toughness is also enhanced by 6.4 times merely by increasing the stretching speeds from 2 to 70 min–1. In addition, the microphase re-separation of PDMS and PPG, together with entropy elasticity of polymer chains, endows the elastomer with a good elastic recovery of ∼98%. Last, the incorporation of a reversible hydrogen bond also allows the elastomers with autonomous self-healing ability (efficiency ∼ 95%). This work opens up the possibility for developing highly stretchable and resilient materials, which can be applied in areas such as artificial muscles.

show abstract

Section: Resultsmentioning

confidence: 99%

Speed-Induced Extensibility Elastomers with Good Resilience and High Toughness

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…PDMS has a Si-O-Si bond angle of 140° 59 exhibiting a certain orientation in space and has a glass transition temperature of -123 °C 60 Other remarkable properties of the membrane include: gas permeability making it transparent to visible and UV light 57 , relative environmental friendliness (it does not bio-accumulate), lowcost and non-toxicity [60][61][62] . These properties, amongst others, gives PDMS advantages over other polymeric membranes, making it the most commonly used polymer among the polyorganosiloxanes 57,63 . These desirable features facilitate using it for biological mimic functions, such as human skin.…”

Section: Poly(dimethylsiloxane) (Pdms)mentioning

confidence: 99%

Poly(dimethylsiloxane): A Sustainable Human Skin Alternative for Transdermal Drug Delivery Prediction

Sabo

Waters

2021

Journal of Pharmaceutical Sciences

View full text Add to dashboard Cite

“…Polydimethylsiloxane (PDMS) is one of the widely used electron-drawing materials for TENG devices due to its high triboelectrification ability, intrinsic hydrophobic characteristics, flexibility, and good thermal stability. ,− However, the nature of the siloxane bonds and the low interchain interactions that contributed to the unique physicochemical properties of PDMS also result in some significant shortcomings of the material, i.e., low strength, low fracture energy (less than 100 J/m 2 ), and microcracks when subjected to external stress . These drawbacks limit the applicability of PDMS, especially as a multifunctional elastomer.…”

Section: Introductionmentioning

confidence: 99%

Super Tough and Self-Healable Poly(dimethylsiloxane) Elastomer via Hydrogen Bonding Association and Its Applications as Triboelectric Nanogenerators

Chen

Koh

Liu

et al. 2020

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

Poly(dimethylsiloxane) (PDMS) as one of the electron-drawing materials has been widely used in triboelectric nanogenerators (TENG), which is expected to generate electron through friction and required to endure dynamic loads. However, the nature of the siloxane bond and the low interchain interaction between the methyl side groups result in low fracture energy in PDMS elastomers. Here, a strategy that combined the advantages of the dynamic of hierarchical hydrogen bonding and phase-separation-like structure was adopted to improve the toughness of PDMS elastomers. By varying both stronger and weaker hydrogen bonding within the PDMS network, a series of super tough (up to 24,000 J/m2), notch-insensitive, transparent, and autonomous self-healable elastomers were achieved. In addition, a hydrophilic polymeric material (PDMAS-U10) was synthesized as the conductive layer. A transparent TENG was fabricated by sandwiching the PDMAS-U10 between two pieces of the PDMS elastomer. Despite its hydrophilic nature, PDMAS-U10 exhibit strong adhesion interaction with hydrophobic PDMS elastomers. As such, a tough (16,500 J/m2), self-healable (efficiency ∼97%), and transparent triboelectric nanogenerator was constructed. A self-powered system employing the TENG is also demonstrated in this work.

show abstract

Reactive Functionally Terminated Polyorganosiloxanes

Cited by 4 publications

References 221 publications

Speed-Induced Extensibility Elastomers with Good Resilience and High Toughness

Speed-Induced Extensibility Elastomers with Good Resilience and High Toughness

Poly(dimethylsiloxane): A Sustainable Human Skin Alternative for Transdermal Drug Delivery Prediction

Super Tough and Self-Healable Poly(dimethylsiloxane) Elastomer via Hydrogen Bonding Association and Its Applications as Triboelectric Nanogenerators

Contact Info

Product

Resources

About