Chemical modification of polysiloxanes with polar pendant groups by co-hydrosilylation

Racleş, Carmen; Alexandru, Mihaela; Bele, Adrian; Musteata, Valentina-Elena; Cazacu, Maria; Opris, Dorina M.

doi:10.1039/c4ra06955b

Cited by 60 publications

(58 citation statements)

References 24 publications

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“…Figure b shows that the dielectric loss Tan δ of all SE‐AT is higher than that of SE (Tan δ = 3.48). An obvious increase in the dielectric loss for the polymers with polar groups also has been found in previous research . The reason was explained as the increase in ion conductivity, as shown in Figure c.…”

supporting

confidence: 81%

A Self‐Healing Dielectric Supramolecular Elastomer Functionalized with Aniline Tetramer

Liu

Yan

Zhang

2018

Macromol. Rapid Commun.

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A new design strategy to produce a supramolecular elastomer with self‐healing and dielectric properties by synthesizing an aniline tetramer (AT)‐functionalized supramolecular elastomer (SE‐AT) is demonstrated. The termination of AT in the supramolecular system not only shortens linear amide molecular chain to decrease glass transition temperature but also destroys the crystallization to achieve amorphous structure. The SE‐AT provides two kinds of noncovalent bonding including π–π stacking and the hydrogen bond, which makes the material more easily healed. The SE‐AT20% can heal mechanical properties within 24 h at room temperature without any external stimulus. The dielectric constant shows a continuous increase overall with increasing AT content. The material exhibits good electro‐mechanical properties, which is attributed to a simultaneous increase in dielectric constant and decrease in modulus. The maximum actuated strain significantly increases with the increasing AT content and the SE‐AT20% reaches 10% at 1 V µm−1. Moreover, SE‐AT exhibits the ability to regain actuated strain on the location of the mechanical damage after self‐healing.

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confidence: 81%

A Self‐Healing Dielectric Supramolecular Elastomer Functionalized with Aniline Tetramer

Liu

Yan

Zhang

2018

Macromol. Rapid Commun.

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“…The DSC thermograms for materials A , B, and C exhibit a glass transition temperature at about -50 °C. [ 14 ] This T g is much higher as compared with parent polymethylvinylsiloxane ( T g = -122 °C), [ 15 ] but still suffi ciently low to allow the use of these materials at low temperatures. Additionally, these materials are also stable in air up to 250 °C (see Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Self‐Repairable, High Permittivity Dielectric Elastomers with Large Actuation Strains at Low Electric Fields

Dünki

Nüesch

et al. 2015

Adv Funct Materials

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159

139

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A one‐step process for the synthesis of elastomers with high permittivity, excellent mechanical properties and increased electromechanical sensitivity is presented. It starts from a high molecular weight polymethylvinylsiloxane, P1, whose vinyl groups serve two functions: the introduction of polar nitrile moieties by reacting P1 with 3‐mercaptopropionitrile (1) and the introduction of cross‐links to fine tune mechanical properties by reacting P1 with 2,2′‐(ethylenedioxy)diethanethiol (2). This twofold chemical modification furnished a material, C2, with a powerful combination of properties: permittivity of up to 10.1 at 104 Hz, elastic modulus Y10% = 154 kPa, and strain at break of 260%. Actuators made of C2 show lateral actuation strains of 20.5% at an electric field as low as 10.8 V μm–1. Additionally, such actuators can self‐repair after a breakdown, which is essential for an improved device lifetime and an attractive reliability. The actuators can be operated repeatedly and reversibly at voltages below the first breakdown. Due to the low actuation voltage and the large actuation strain applications of this material in commercial products might become reality.

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“…The properties of PDMS may be tailored by adding complimentary functional groups to the polymer [5][6][7]; adding functionality to the end of the PDMS chain produces α, ω-difunctional A c c e p t e d M a n u s c r i p t species. Such polymers may be macromonomers as with suitable functionality at the chain ends they may be coupled to form higher molar mass products.…”

Section: Introductionmentioning

confidence: 99%

Linear and star architecture methacrylate-functionalised PDMS

Cheesman

Gates

Castle³

et al. 2015

Materials Today Communications

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Methacrylate-terminated poly(dimethylsiloxane)s in both linear and star architectures have been produced through a time-efficient 1 pot, 2 stage reaction which involved hydrosilylation of small molecule silanes with allyl methacrylate and subsequent equilibration of the product with octamethylcyclotetrasiloxane (D 4 ) in the presence of an acid catalyst. This synthetic route required only one work-up procedure and the products were comparable to those produced by 2 step processes typically reported in literature. All methacrylate-terminated products were approximately double the molar masses anticipated based on reagent loadings. This is thought to be due to redistribution of siloxane bonds in the presence of the platinum hydrosilylation catalyst accompanied by a loss of silicon from the reaction by evaporation of dimethylsilane. It is believed that this is the first report of such siloxane equilibration occurring at room temperature.

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Chemical modification of polysiloxanes with polar pendant groups by co-hydrosilylation

Cited by 60 publications

References 24 publications

A Self‐Healing Dielectric Supramolecular Elastomer Functionalized with Aniline Tetramer

A Self‐Healing Dielectric Supramolecular Elastomer Functionalized with Aniline Tetramer

Self‐Repairable, High Permittivity Dielectric Elastomers with Large Actuation Strains at Low Electric Fields

Linear and star architecture methacrylate-functionalised PDMS

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