3D printing of polybutadiene rubber cured by photo-induced thiol-ene chemistry: A proof of concept

Bragaglia, Mario; Lamastra, Francesca Romana; Cherubini, Valeria; Nanni, Francesca

doi:10.3144/expresspolymlett.2020.47

Cited by 16 publications

(14 citation statements)

References 27 publications

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“…Further, the difference between the maximum and minimum torques (MH � ML ¼ DM) is related to the crosslink density, which is inversely related to the rubber swelling (in a suitable solvent). 31 The slopes of the rheological curves indicate that the modified soybean oils accelerate the vulcanization/curing reaction. E-SBR/BR/ONAF and E-SBR/BR/OEST have similar MH and DM values but significantly different optimum curing times (t 90 ; 9.9 and 7.3 min, respectively), indicating that the soybean oil has an advantage when compared with the petrochemical oil.…”

Section: Rheological Parameters and Swellingmentioning

confidence: 99%

Chemically modified soybean oils as plasticizers for silica-filled e-SBR/Br compounds for tire tread applications

Lovison

Freitas

Forte

2021

Journal of Elastomers & Plastics

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Silica-filled styrene butadiene rubber (SBR)/butadiene rubber (BR) compounds plasticized with mineral oils are mainly used to produce green tire treads. Previous works have demonstrated that the partial replacement of naphthenic oil (ONAF) by bio-based oils can provide processing and performance improvements for rubber compounds, along with environmental benefits. In this study, two modified soybean oils (esterified, OEST or esterified and epoxidized, OEPX) were investigated with the aim of evaluating the complete replacement of ONAF and determining whether the chemical properties of the oils affect the performance of silica-filled E-SBR/BR compounds, using the compound with ONAF as a reference. The physical properties, curing characteristics, morphology, and dynamic mechanical behavior were evaluated. The use of the modified soybean oils decreased the optimal cure time while increasing the crosslink density and the abrasive wear resistance. Further, the compounds with both modified soybean oils showed a good balance of mechanical properties. The modified soybean oils decreased the glass transition temperature of the rubber compounds, thus acting as true plasticizers. At 0°C, the tan δ value of E-SBR/BR/OEPX increased relative to that of E-SBR/BR/ONAF, whereas at 60°C, the values of the compounds with both modified soybean oils showed slight increases. The tan δ values reveal that compared with E-SBR/BR/ONAF, E-SBR/BR/OEPX has better wet grip and a similar rolling resistance, whereas E-SBR/BR/OEST has a higher rolling resistance. Thus, both modified soybean oils can fully replace ONAF and appear to be extremely attractive plasticizers for use in silica-filled E-SBR/BR compounds employed as green tire treads for passenger cars.

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Section: Rheological Parameters and Swellingmentioning

confidence: 99%

Chemically modified soybean oils as plasticizers for silica-filled e-SBR/Br compounds for tire tread applications

Lovison

Freitas

Forte

2021

Journal of Elastomers & Plastics

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“…[128][129][130][131] Although in industry cross-linked rubber is produced mainly by the vulcanization process, the ability to adjust the structure of cross-links with thiol-X reactions to more specific applications is largely investigated in the literature. [132][133][134][135][136][137] The most commonly employed thiols to photo-cross-link are shown in Figure 9. Schlögl and coworkers employed thiol-ene reactions to photocross-link liquid isoprene rubber to obtain precise structures by 3D printing.…”

Section: Rubber Modifications Via Thiol-x Reactionsmentioning

confidence: 99%

Enzymatic and Chemical Approaches for Post‐Polymerization Modifications of Diene Rubbers: Current state and Perspectives

Soares

Steinbüchel

2021

Macromolecular Bioscience

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Diene rubbers are polymeric materials which present elastic properties and have double bonds in the macromolecular backbone after the polymerization process. Post-polymerization modifications of rubbers can be conducted by enzymatic or chemical methods. Enzymes are environmentally friendly catalysts and with the increasing demand for rubber waste management, biodegradation and biomodifications have become hot topics of research. Some rubbers are renewable materials and are a source of organic molecules, and biodegradation can be conducted to obtain either oligomers or monomers. On the other hand, chemical modifications of rubbers by click-chemistry are important strategies for the creation and combination of new materials. In a way to expand the scope of uses to other non-traditional applications, several and effective modifications can be conducted with diene rubbers. Two groups of efficient tools, enzymatic, and chemical modifications in diene rubbers, are summarized in this review. By analyzing stereochemical and reactivity aspects, the authors also point to some applications perspectives for biodegradation products and to rational modifications of diene rubbers by combining both methodologies.

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“…However, traditional fabrication of silicone rubber costs a large amount of energy and time with nonnegligible environmental pollution and low accuracy, 32 which has severely restricted its further applications. Among different kinds of new developed processing methods for rubber, light curing three-dimensional (3D) printing 33 and the subtractive method through laser pyrolysis 34 etc. promise rubber new functions, low-cost, and fast fabrication speed, as well as high manufacturing accuracy.…”

Section: Introductionmentioning

confidence: 99%

3D Printable Silicone Rubber for Long-Lasting and Weather-Resistant Wearable Devices

Wang

Chen

et al. 2022

ACS Appl. Polym. Mater.

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Flexible wearable devices based on gels are attracting widespread attentions. However, the stability and fatigue resistance of gels always conflict with their stretchability and conductivity, which severely limit their practical applications. Herein, we propose a flexible gel wearable device based on two networks of thiol−ene and acrylate, exhibiting marvelous flexibility, sensitivity, weather resistance, as well as stability. We use silicone rubber as a cross-linking monomer, and the addition of PC solution containing lithium trifluoride domains the conductivity of the cross-linked polymer. The unique − Si−O− chain of silicone rubber plays a key role in the excellent stability and weather resistance of the silicone rubber, who still maintains good conductivity after exposing outdoors for one month. In addition, our rubber works well within a very large temperature range (−50 °C -120 °C), which greatly extends the potential applications of gel-based wearable devices. Most significantly, our silicone rubber is 3D printable, which drastically shorten the fabrication time for high-precision complex 3D structures to further enhance the sensitivity of wearable devices. The present study provides the feasibility of making durable and weather-resistant wearable devices working in harsh environment.

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3D printing of polybutadiene rubber cured by photo-induced thiol-ene chemistry: A proof of concept

Cited by 16 publications

References 27 publications

Chemically modified soybean oils as plasticizers for silica-filled e-SBR/Br compounds for tire tread applications

Chemically modified soybean oils as plasticizers for silica-filled e-SBR/Br compounds for tire tread applications

Enzymatic and Chemical Approaches for Post‐Polymerization Modifications of Diene Rubbers: Current state and Perspectives

3D Printable Silicone Rubber for Long-Lasting and Weather-Resistant Wearable Devices

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