In situ monitoring by DSC and modeling of curing of vinyl polysiloxanes in layered silicate nanocomposites

Vasilakos, Sozon; Tarantili, P. A.

doi:10.1007/s10973-016-5821-z

Cited by 16 publications

(12 citation statements)

References 28 publications

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“…The tensile strength increased by 27% after heating at 100°C, and the elongation at break increased by 7% at 100°C and by 20% at 150°C. There are many literature reports of secondary cross‐linking reactions occurring after PDMS has been cross‐linked by addition reactions 24,25 . It is assumed that such a secondary cross‐linking reaction improved the physical properties of the PDMS nanosheets after the heat resistance test.…”

Section: Resultsmentioning

confidence: 99%

Preparation and characterization of highly elongated polydimethylsiloxane nanosheets

Mihara

Takeoka

2022

Polymers for Advanced Techs

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Polydimethylsiloxane (PDMS) is a biocompatible polymer that exhibits high flexibility and heat resistance. PDMS can be rapidly cross‐linked at low temperatures by a platinum‐catalyzed addition reaction and is used to create nanostructures owing to its high formability. In this study, free‐standing PDMS thin films (PDMS nanosheets) were fabricated and characterized. PDMS nanosheets, about 90–2500 nm thick, were prepared using a microgravure coater. The mechanical properties of the PDMS nanosheets depended on the amount of cross‐linker added in preparation. For example, a 93‐nm‐thick PDMS nanosheet showed high flexibility with elongation at break of 338% and Young's modulus of 0.46 MPa. The adhesion strength of the PDMS nanosheets was also dependent on the amount of cross‐linker, and the lesser the cross‐linker, the higher the adhesion strength. The PDMS nanosheets showed no change in physical properties when annealed at 150°C. Flexible, adhesive, and heat‐resistant PDMS nanosheets were demonstrated as a substrate for skin‐contact strain sensors and showed resistance changes of 20%–30% in response to skin stretching.

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Section: Resultsmentioning

confidence: 99%

Preparation and characterization of highly elongated polydimethylsiloxane nanosheets

Mihara

Takeoka

2022

Polymers for Advanced Techs

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“…7). A single exothermic peak was shown in DSC thermograms for each sample demonstrated the single-step reaction kinetics for silicone rubber that depicted no change in curing mechanism in presence of HNTs in silicone matrix [50]. Meanwhile, the result depicted that incorporation of tubular clay in silicone rubber matrix strongly affected the curing process of system.…”

Section: State Of Cure Of Sr/hnt Nanocompositesmentioning

confidence: 85%

Well-cured silicone/halloysite nanotubes nanocomposite coatings

Karami

Jazani

Navarchian

et al. 2019

Progress in Organic Coatings

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Silicone elastomer coatings are known for their softness and high elongation properties, but not for faithful service over time because of their inadequate adhesion, thermal, and mechanical properties.Addition of nanofillers to silicone would be the solution to such long-standing shortcomings, but yet there is a little guarantee of success because of silicone crosslinking being significantly hindered by filler incorporation. In this work, well-cured 3D silicone networks are formed by epoxide curing in the presence of pristine and silane-functionalized halloysite nanotubes (HNTs). Nanofillers are incorporated into silicone at different loadings and the curing potential of the resulting nanocomposite coatings are evaluated by dimensionless indexes of T* and ∆H* calculated from nonisothermal differential scanning calorimetry. Regardless of the content and surface chemistry of the HNTs, silicone nanocomposite was outstandingly cured by peroxide thanks to reactive surface of nanofillers. Overall, ∆H* value of ≈ 2 was indicative of a two-fold rise in the amount of heat released in silicone nanocomposites whatever heating rate. Moreover, T* values obtained were almost lower than the one, a signature of an unhindered curing.The excellence of facilitated crosslinking brought about by the use of HNTs was featured by an improved polymer-filler interaction, which is responsible for coating applications.

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“…The influence of the tested additives on the vulcanization process of CR was also studied using the DSC analysis. This method is commonly used to investigate the curing process of polymers 15,[33][34][35] and allows for the determination of the temperature and the enthalpy of vulcanization. The results are given in Table 5.…”

Section: Thermal Evaluation Of Cr Vulcanization and Thermal Stabilimentioning

confidence: 99%

CR composites with improved processing safety crosslinked via Heck's reaction

Dziemidkiewicz

Maciejewska

2020

J of Applied Polymer Sci

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The aim of this study was to optimize the composition of the chloroprene rubber (CR) composites crosslinked via the Heck-type reaction to ensure their safe processing at elevated temperature. The developed curing system consisting of iron (III) acetylacetonate (Fe(acac)) and triethanolamine (TEOA) demonstrates high activity and more eco-friendly composition in comparison with metal oxide system, commercially used for CR crosslinking. However, the high activity of Fe(acac)/TEOA system results in a short scorch time, which is the greatest disadvantage regarding the safe processing of CR rubber and thus, must be improved. Therefore, CR compounds with Fe(acac) in the presence of different additives were studied. The longest scorch times (t 02) were observed for rubber compounds with urotropine (U), N-cyclohexyl-2-benzothiazole sulfenamide (CBS) or salicylic acid. Moreover, vulcanizates containing these additives exhibited higher tensile strengths and elongation at breaks compared to CR crosslinked with Fe(acac)/TEOA system.

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In situ monitoring by DSC and modeling of curing of vinyl polysiloxanes in layered silicate nanocomposites

Cited by 16 publications

References 28 publications

Preparation and characterization of highly elongated polydimethylsiloxane nanosheets

Preparation and characterization of highly elongated polydimethylsiloxane nanosheets

Well-cured silicone/halloysite nanotubes nanocomposite coatings

CR composites with improved processing safety crosslinked via Heck's reaction

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