The synthesis and characterization of supramolecular elastomers based on linear carboxyl-terminated polydimethylsiloxane oligomers

Yang, Lin; Lin, Yaling; Wang, Lianshi; Zhang, Anqiang

doi:10.1039/c3py01005h

Cited by 54 publications

(52 citation statements)

References 24 publications

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“…Synthesis of ESESi. The ESESi elastomer was synthesized via a two-step process shown in Scheme 2, which is similar to the reaction in our previous work [28][29][30] and Leibler's report. 31,32 In the rst step, EPDMS x -COOH 2 (x ¼ 1/9, 1/11, or 1/15) and DETA were added at room temperature in a thermostated reactor tted with a Dean-Stark trap, a stirring system, and a nitrogen inlet, with a [-NH 2 ]/[-COOH] molar ratio of 2.2/1.…”

Section: Preparation Of Esesimentioning

confidence: 98%

Absorptive supramolecular elastomer wound dressing based on polydimethylsiloxane–(polyethylene glycol)–polydimethylsiloxane copolymer: preparation and characterization

et al. 2016

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Polydimethylsiloxanes (PDMS) are soft materials with high elasticity and excellent biocompatibility, giving them high potential for widespread applications as biomaterials. However, the application of PDMS to wound dressing is limited due to its shortcomings, particularly its non-absorptive and poor adhesive properties. This work addresses these limitations in two ways: first, a hydrophilic and biocompatible polyethylene glycol (PEG) block was introduced to the PDMS main chain to obtain carboxyl acid terminated PDMS-b-PEG-b-PDMS copolymers (EPMDS-COOH 2 ); second, EPMDS-COOH 2 polymers were reacted with diethylenetriamine and urea via a two-stage route to obtain a novel supramolecular elastomer (ESESi) based on multiple hydrogen bond association. Compared with the supramolecular elastomer based on simple PDMS (SESi), the hydrophilicity, water-absorption rate, adhesive ability and rate of water vapor permeation were significantly improved, enhancing the properties of ESESi films for application to wound dressing. After fully evaluating the bio-compatibilities of ESESi films, a fullthickness dermal wound model was chosen to estimate the healing performance, and traditional vaseline gauze, SESi film and commercialized Tegaderm™ film were chosen as controls. The results confirmed that the ESESi polymer could promote the healing of a skin wound to some extent, mainly due to its improved absorption and adhesive properties.

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Section: Preparation Of Esesimentioning

confidence: 98%

Absorptive supramolecular elastomer wound dressing based on polydimethylsiloxane–(polyethylene glycol)–polydimethylsiloxane copolymer: preparation and characterization

et al. 2016

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“…19 An SESi was synthesized via a three-step synthesis process, as presented in Scheme 2; this was similar to the route reported by Leibler et al 16 Briefly, PDMS-COOH 2 reacted with UDETA in step 1 to introduce imidazolidone groups and were then reacted with DETA in step 2 to introduce secondary amines and increase the molecular weight. In step 3, 1,1-dialkyl urea was formed as a result of the reaction between amine and urea.…”

Section: Synthesis Proceduresmentioning

confidence: 99%

“…In our previous study, we found that with bifunctional carboxyl-terminated polydimethylsiloxane (PDMS-COOH 2 ), we successfully obtained SESis that exhibited rubberlike properties at room temperature. 18,19 Compared with the use of a mixture of mono-, di-, and tri-acids, the use of bifunctional linear oligomers is a more controllable synthesis route; it could help us to study the reaction mechanism and crosslinking structure in this system. We also studied the relationship between the mechanical, rheological, and self-healing properties of this material and the polydimethylsiloxane (PDMS) chain length in detail; this provided us with guidance for adjusting the properties of the SESis.…”

Section: Introductionmentioning

confidence: 99%

Crosslinking mechanism of supramolecular elastomers based on linear bifunctional polydimethylsiloxane oligomers

You

Zhang

Lin

2016

J of Applied Polymer Sci

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Supramolecular elastomers (SESis) were synthesized via a simplified synthesis route on the basis of a linear bifunctional polydimethylsiloxane. Compared with previous synthesis methods, the structure of the product was much clearer. The 1 H-NMR titration results show that the hydrogen-bond associations in SESis were relatively weak. During 1 H-NMR reaction monitoring, the viscosity analysis of SESis and the model reactions demonstrated a previously neglected covalent crosslinking reaction not only during the reaction process but also during the postprocess; this led to a hybrid network, that is, covalent crosslinking and hydrogen association, in SESis. This finding explained the poor solubility of the SESis, and it provides us with an important way to controllably synthesize this material and adjust its properties.

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“…At room temperature, this material is noncrystallizable. In further research [45], Zhang studied the reaction mechanism of this system, which testified to the performance of the elastomers with different composition. The results showed that the rheological, mechanical, and self-healing properties can be adjusted by altering the PDMS chain length.…”

Section: 6mentioning

confidence: 99%

Supramolecular network-based self-healing polymer materials

Deng

You

Zhang

2015

Recent Advances in Smart Self-Healing Polymers and Composites

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The synthesis and characterization of supramolecular elastomers based on linear carboxyl-terminated polydimethylsiloxane oligomers

Abstract: Supramolecular elastomers obtained through a two-step reaction of linear carboxyl-terminated polydimethylsiloxane oligomers (PDMS–COOH2) with diethylenetriamine (DETA) and urea show reasonable hysteresis and acceptable self-healing properties.

Cited by 54 publications

References 24 publications

Absorptive supramolecular elastomer wound dressing based on polydimethylsiloxane–(polyethylene glycol)–polydimethylsiloxane copolymer: preparation and characterization

Absorptive supramolecular elastomer wound dressing based on polydimethylsiloxane–(polyethylene glycol)–polydimethylsiloxane copolymer: preparation and characterization

Crosslinking mechanism of supramolecular elastomers based on linear bifunctional polydimethylsiloxane oligomers

Supramolecular network-based self-healing polymer materials

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