The impact of water released from boehmite nanoparticles during curing in epoxy‐based nanocomposites

Waniek, Tassilo; Braun, Ulrike; Silbernagl, Dorothee; Sturm, Heinz

doi:10.1002/app.51006

Cited by 4 publications

(2 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the residue found from TGA measurements depicts a nonlinear dependence and exhibits lower BNP amounts than formulated. However, as the BNP was not dried, some of the initial mass might be attributed to water contained in the nanoparticles, which can be, in principle, lost at high temperatures during the TGA measurements . Furthermore, some BNP might be lost during the electrospinning process from the spinning solution, where also BNP might be deposited outside the rotating collector.…”

Section: Resultsmentioning

confidence: 99%

“…However, as the BNP was not dried, some of the initial mass might be attributed to water contained in the nanoparticles, which can be, in principle, lost at high temperatures during the TGA measurements. 37 Furthermore, some BNP might be lost during the electrospinning process from the spinning solution, where also BNP might be deposited outside the rotating collector. Therefore, all estimated quantities are plotted versus the formulated BNP concentration.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Electrospun Nanocomposite Fibers of Polycarbonate- and Taurine-Modified Boehmite Nanoparticles: What Can Be Learned from Structural and Thermal Investigations?

Murillo

Szymoniak

Smales

et al. 2021

ACS Appl. Polym. Mater.

Self Cite

View full text Add to dashboard Cite

Though the reinforcing properties of inorganic particles in thermosetting nanocomposites have been exploited, the integration of nanoparticles continues to be challenging in terms of their homogeneous distribution and their manipulation, which can contribute to occupational hazards. Due to second encapsulations of nanoparticles, electrospun nanocomposite fibers containing nanoparticles might be an alternative for overcoming these issues, as the nonwoven fibers contain nanoparticles allowing for safer manipulation. Here, the morphology and the thermal properties of electrospun polycarbonate fibers containing taurinemodified boehmite nanoparticles (BNPs) are investigated by means of small-and wide-angle X-ray scattering as well as fast scanning and temperature-modulated fast scanning calorimetry for the first time. The latter techniques allow the investigation of the thermal properties of single fibers at heating rates of up to 10 4 K s −1 keeping their structure intact. An analysis of the scattering data reveals a porous structure of the fibers. The porous structure is quantified regarding the pore volume and the pore size. A constant amount of aggregation is found even for the highly BNP-loaded fibers. Thermal analysis of the fibers reveals a rigid amorphous fraction (RAF), where it is known that the RAF determines the properties of a nanocomposite to a large extent. For the fibers, the RAF amounts up to 40 wt %, which is essentially higher compared to equally formulated PC/BNP composite cast films. The RAF, in the case of fibers, is not only due to the presence of particles in the polymer but also due to the orientation effects induced by the electrospinning process.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Electrospun Nanocomposite Fibers of Polycarbonate- and Taurine-Modified Boehmite Nanoparticles: What Can Be Learned from Structural and Thermal Investigations?

Murillo

Szymoniak

Smales

et al. 2021

ACS Appl. Polym. Mater.

Self Cite

View full text Add to dashboard Cite

show abstract

The influence of water released from particles in epoxy‐based nanocomposites

Waniek,

Omar,

Szymoniak

et al. 2024

J of Applied Polymer Sci

View full text Add to dashboard Cite

Recent studies have hypothesized that the reinforcing effects of boehmite nanoparticles (BNPs) in polymer nanocomposites (PNCs) are partly related to the particles themselves and partly to the water released from the BNP during curing. In this work, PNCs made from dried BNP (dBNP) with concentrations up to 15 wt% are investigated to differentiate particle and water related effects. The observed trend of the storage modulus in dynamic mechanical thermal analysis measurements was found to be independent of the drying procedure. Stiffness maps from intermodulation atomic force microscopy showed that dBNP leads to a stiffening of the interphase surrounding the particles compared with the unaffected epoxy matrix, while a softer interphase was reported for PNCs with as received BNP. A slight decrease in the glass transition temperature was observed by broadband dielectric spectroscopy related to a lowered crosslink density due to the particles. A significantly higher decrease was reported for PNCs with BNP, attributed to water influencing the curing process. In conclusion, the stiffening of PNC with BNP is related to the particles themselves, while the release of water causes the formation of a soft interphase in the vicinity of the particles and a significant decrease in crosslink density.

show abstract

Formation of fiber composites with an epoxy matrix: state-of-the-art and future development

Uflyand

Иржак

2021

Materials and Manufacturing Processes

View full text Add to dashboard Cite

The impact of water released from boehmite nanoparticles during curing in epoxy‐based nanocomposites

Cited by 4 publications

References 43 publications

Electrospun Nanocomposite Fibers of Polycarbonate- and Taurine-Modified Boehmite Nanoparticles: What Can Be Learned from Structural and Thermal Investigations?

Electrospun Nanocomposite Fibers of Polycarbonate- and Taurine-Modified Boehmite Nanoparticles: What Can Be Learned from Structural and Thermal Investigations?

The influence of water released from particles in epoxy‐based nanocomposites

Formation of fiber composites with an epoxy matrix: state-of-the-art and future development

Contact Info

Product

Resources

About