Localizing the cross-links distribution in elastomeric composites by tailoring the morphology of the curing activator

Mostoni, S; Milana, Paola; Marano, Claudia; Conzatti, Lucia; Mauri, Michele; D’Arienzo, Massimiliano; Credico, Barbara Di; Simonutti, Roberto; Stagnaro, Paola; Scotti, Roberto

doi:10.1016/j.compscitech.2022.109780

Cited by 6 publications

(4 citation statements)

References 55 publications

(51 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Figure i, the decay is faster in the nanocomposite, indicating a reduction in the local mobility of the polymer chains in the presence of the NCs. The Gaussian contribution associated with a fully rigid fraction extracted by bimodal fitting quantitatively demonstrate an increased rigid fraction from 59 ± 1% to 66 ± 1% in the nanocomposite, which is a typical consequence of the decrease of polymer chain motions due to attractive interactions with the NCs . Here, it is a further indication of the strong affinity between the NCs and the polymer matrix, which contributes to avoiding aggregation and obtaining a homogeneous dispersion.…”

mentioning

confidence: 85%

“…The Gaussian contribution associated with a fully rigid fraction extracted by bimodal fitting quantitatively demonstrate an increased rigid fraction from 59 ± 1% to 66 ± 1% in the nanocomposite, which is a typical consequence of the decrease of polymer chain motions due to attractive interactions with the NCs. 77 Here, it is a further indication of the strong affinity between the NCs and the polymer matrix, which contributes to avoiding aggregation and obtaining a homogeneous dispersion. To further investigate the possible roles of the polymerization initiators or UV light in the NC evolution process, we monitored the structural and optical properties of native NCs dispersed in the monomer mixture without initiators or UV illumination over time.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Ultrafast and Radiation-Hard Lead Halide Perovskite Nanocomposite Scintillators

Erroi,

Mecca,

Zaffalon

et al. 2023

ACS Energy Lett.

Self Cite

View full text Add to dashboard Cite

The use of scintillators for the detection of ionizing radiation is a critical aspect in many fields, including medicine, nuclear monitoring, and homeland security. Recently, lead halide perovskite nanocrystals (LHP-NCs) have emerged as promising scintillator materials. However, the difficulty of affordably upscaling synthesis to the multigram level and embedding NCs in optical-grade nanocomposites without compromising their optical properties still limits their widespread use. In addition, fundamental aspects of the scintillation mechanisms are not fully understood, leaving the scientific community without suitable fabrication protocols and rational guidelines for the full exploitation of their potential. In this work, we realize large polyacrylate nanocomposite scintillators based on CsPbBr3 NCs, which are synthesized via a novel room temperature, low waste turbo-emulsification approach, followed by their in situ transformation during the mass polymerization process. The interaction between NCs and polymer chains strengthens the scintillator structure, homogenizes the particle size distribution and passivates NC defects, resulting in nanocomposite prototypes with luminescence efficiency >90%, exceptional radiation hardness, 4800 ph/MeV scintillation yield even at low NC loading, and ultrafast response time, with over 30% of scintillation occurring in the first 80 ps, promising for fast-time applications in precision medicine and high-energy physics. Ultrafast radioluminescence and optical spectroscopy experiments using pulsed synchrotron light further disambiguate the origin of the scintillation kinetics as the result of charged-exciton and multiexciton recombination formed under ionizing excitation. This highlights the role of nonradiative Auger decay, whose potential impact on fast timing applications we anticipate via a kinetic model.

show abstract

mentioning

confidence: 85%

mentioning

confidence: 99%

Ultrafast and Radiation-Hard Lead Halide Perovskite Nanocomposite Scintillators

Erroi,

Mecca,

Zaffalon

et al. 2023

ACS Energy Lett.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, compared to the conventionally used powdered ZnO, this approach was able to reduce the total amount of zinc and also to increase the curing efficiency and dynamic mechanical properties of isoprene rubber (IR) nanocomposites used as a classical industrial vulcanization model reaction. [13,15] Based on this background, the current work aimed to investigate the influence of the filler morphology used to obtain Zn@SiO 2 on the distribution of zinc active sites in the rubber composites and the resulting curing efficiency, as well as their mechanical properties. For this purpose, the functionalized Zn@SiO 2 nanoparticles were arranged in new micrometer-sized units, so-called supraparticles, [16] by exploiting a different drying procedure, i.e., by replacing the classical oven treatment with a spray-drying approach.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assembly of Zinc‐Single‐Site‐Containing Silica Nanoparticles to Supraparticle Powders with Destructibility to Serve as Filler and Vulcanization Activator in Rubbers

Wenderoth,

Milana,

Zimmermann

et al. 2024

Part & Part Syst Charact

Self Cite

View full text Add to dashboard Cite

The vulcanization process is widely used in industry for tire manufacturing. Therefore, zinc oxide is commonly utilized as an activator material, but unreacted zinc oxide remains in the final products and can be released into the environment with a significant impact. To reduce the amount of required zinc and to prevent leaching from tire material, zinc single site‐containing silica fillers are interesting candidates. In these materials, zinc sites are anchored on the surface of silica nanoparticles through their complexation with functionalized aminosilanes. Based on these, a novel powder sample is prepared via spray‐drying. The obtained supraparticles allow for a homogeneous distribution of the filler nanoparticles in the rubber matrix via their disintegration during the incorporation process. All synthesis steps are carried out in ethanol and water, respectively, at very mild temperatures to account for sustainability demands. As core of this study, the role of zinc ions and their amino‐complexation in nanoparticle dispersion stability and in supraparticle formation during spray‐drying is elucidated. Additionally, the superior performance of supraparticles as activator in rubber vulcanization is demonstrated. These show a higher curing efficiency, leading to lower curing time (−70%), higher torque values (+15%), and improved dynamic mechanical properties compared to the conventional ZnO activator.

show abstract