Revealing phase-specific properties of elastomeric blends and their molecular structure at the nanoscale by AFM

Fernandes, João Paulo Cosas; Federico, Carlos Eloy; Basterra-Beroiz, Beatriz; Weydert, Marc; Quintana, Robert

doi:10.1016/j.polymer.2022.125229

Cited by 8 publications

(8 citation statements)

References 34 publications

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“…In multiphase systems, it is expected to find differences in the local phase stiffness. The research of Klat et al [ 10,11 ] in NR/SBR blends and Cosas Fernandes et al [ 15,16 ] in NR/BR blends show it very clearly through nanomechanical mappings determined by AFM measurements at high frequency (from 1 kHz up to 1.6 MHz).…”

Section: Theorymentioning

confidence: 99%

“…By varying the amount of sulfur and accelerator, it is possible to adjust the concentration and type of crosslinks with important consequences on the physical properties of the cured material. [12][13][14][15][16] Over the last few years, our research group has been investigating the morphological and physical properties of NR/SBR compounds blended by the solution technique. Vulcanized blends prepared using a conventional (CV) cure system with a ratio A/S of 0.75/2.25 [8,9,[17][18][19][20] , and with a semi-EV formulation with a ratio A/S of 1.5/1.5 [21] were analyzed by means of several experimental techniques.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic mechanical properties in natural rubber/styrene‐butadiene rubber blends: The local strain behavior in the glass transition region

Marzocca

Mansilla

2023

Polymer Engineering & Sci

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A study of the local strains developed in vulcanized blends of natural rubber (NR) and styrene butadiene rubber (SBR), prepared by solution mixing, is presented. A semi‐EV system based on sulfur and accelerator was used for curing unfilled compounds at 160°C and 170°C. Samples were characterized by dynamic mechanical properties between −80°C and 20°C. Special interest was placed on the glass transition region of the vulcanized immiscible blends, where the NR and SBR phases are rubbery and glassy respectively. From the study of loss modulus, this research demonstrates how the local strain in the NR phase changes as a function of the amount of SBR in the blend. Assuming a coalescence behavior of the SBR glassy phase above a certain concentration, differences in the local stiffness of each phase in the glass transition regime were found. While in the glassy SBR phase the stiffness slightly varies with the NR/SBR content, a notorious increase was obtained in the rubbery NR phase at higher SBR content. The local strain on the NR phase of the blends shows a slight decrease for the samples vulcanized at 170°C compared with those vulcanized at 160°C.

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Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic mechanical properties in natural rubber/styrene‐butadiene rubber blends: The local strain behavior in the glass transition region

Marzocca

Mansilla

2023

Polymer Engineering & Sci

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“…4 Detailed scientific investigation of the preparation of nanocomposites, varying the nanocellulose morphology (CNCs/MFCs), surface chemistry and volume fraction can be found in the literature, showing a significant reinforcement over the neat matrix, while keeping extensibility in the range of the unfilled elastomer. 2,[5][6][7] In general, the homogeneous dispersion of the additives and fillers, [8][9][10][11][12][13] their orientation, 5,14,15 and the developed interfaces [16][17][18][19][20][21][22] play a key role in the mechanical properties of the composites and can range from a few microns down to tens of nanometers, requiring high lateral resolution characterization techniques.…”

Section: Introductionmentioning

confidence: 99%

“…In general, the homogeneous dispersion of the additives and fillers, 8–13 their orientation, 5,14,15 and the developed interfaces 16–22 play a key role in the mechanical properties of the composites and can range from a few microns down to tens of nanometers, requiring high lateral resolution characterization techniques.…”

Section: Introductionmentioning

confidence: 99%

Cellulose nanocrystals as nucleating agents for the strain induced crystallization in natural rubber

et al. 2022

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Ultrathin Film Hydrogels with Controlled Swelling and Viscoelastic Properties Deposited by Nanosecond Pulsed Plasma Induced‐Polymerization

Sans,

Azevedo Gonçalves,

Quintana

2023

Adv Materials Inter

Self Cite

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Development of ultrathin film (utf) hydrogels for cutting‐edge biomedical applications (i.e. artificial skins) is receiving increasing attention. Nonetheless, achieving accurate control on the structure and thickness of utf‐hydrogels becomes extremely complex when assessed through conventional techniques. In this work, an atmospheric‐pressure plasma‐assisted deposition technique is reported, showing great thickness accuracy and versatility, to design utf‐hydrogels with customized properties. For the first time, specific and independent control on the generation and nature of cross‐links by only changing the plasma exposure frequency (fPE) during the synthesis process are reported. Thus, utf‐hydrogels are successfully prepared with tuned swelling ratios and viscoelastic properties (ranging from 150 to 20 kPa). Moreover, a thickness accuracy of 9 nm is reported, permitting the accurate synthesis of utf‐hydrogels below 150 nm. Exhaustive structural and topographical analyses allow elucidating the effects of the fPE on the cross‐link generation mechanism, discarding any undesired effect on the thickness accuracy. To support the structural results obtained, quartz‐crystal microbalance with dissipation (QCM‐D) coupled with spectroscopic ellipsometry are put in the spotlight as an efficient and viable alternative for the characterization of the resulting properties of ultrathin film soft materials, including the presence of a hydrated layer at the interface.

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Revealing phase-specific properties of elastomeric blends and their molecular structure at the nanoscale by AFM

Cited by 8 publications

References 34 publications

Dynamic mechanical properties in natural rubber/styrene‐butadiene rubber blends: The local strain behavior in the glass transition region

Dynamic mechanical properties in natural rubber/styrene‐butadiene rubber blends: The local strain behavior in the glass transition region

Cellulose nanocrystals as nucleating agents for the strain induced crystallization in natural rubber

Ultrathin Film Hydrogels with Controlled Swelling and Viscoelastic Properties Deposited by Nanosecond Pulsed Plasma Induced‐Polymerization

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