Creep and stress relaxation behavior of functionalized microcrystalline cellulose/epoxy composites

Neves, Roberta Motta; Ornaghi, Heitor Luiz; Alves, Fillip Cortat; Zattera, Ademir J.; Tom, Milanta; Lal, Hiran Mayookh; Uthaman, Arya; Thomas, Sabu

doi:10.1007/s10570-022-05020-8

Cited by 8 publications

(10 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the addition of MCC, chain mobility is restricted by the presence of a filler, therefore leading to a lower creep strain. Similar behavior was observed 20 when comparing the creep behavior of epoxy resins reinforced with untreated and silane treated MCC at a 5 wt% content. As for the role of water in a DGEBA network, it is agreed that plasticization occurs by water that solvates the polar sites in the epoxy network 29 .…”

Section: Resultssupporting

confidence: 80%

“…This could be due to the sliding of the particles onto the amorphous portions of the polymeric chains when submitted to stress. 20 As the filler content is increased, the creep strain decreases proportionally, probably due to aggregation of the MCC particles-as seen in the micrographs in Figure 1.…”

Section: Creep/recoverymentioning

confidence: 90%

“…In this case, it is possible that stiff particles such as MCC can limit the molecular motions of epoxy chains, increasing the storage modulus especially in the rubbery region, as also observed elsewhere. 20 Table 2 summarizes the results from the storage modulus curves for dry and saturated samples. The storage modulus in the glassy region reduced for neat epoxy but increased by 53% for the MCC 10.0 wt% composite.…”

Section: Dynamic Mechanical Analysismentioning

confidence: 99%

“…20 A polymer's viscoelastic response is dependent on the temperature and on the applied stresses. 20 As such, changes in the creep behavior could help evaluate the effect of particles or moisture in the molecular motions of amorphous chain segments. This is a gap in the literature that could potentially be addressed in our work.…”

Section: Introductionmentioning

confidence: 99%

“…Creep tests have been recently done in untreated and silane treated MCC/epoxy composites. The creep behavior of the MCC/epoxy composites at 5 wt% reinforcement was evaluated, and reports found that MCC improved the integrity of the composites regardless of treatment 20 . A polymer's viscoelastic response is dependent on the temperature and on the applied stresses 20 .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Impact of water absorption on the creep performance of epoxy/microcrystalline cellulose composites

Lavoratti,

Bianchi,

Cruz

et al. 2024

J of Applied Polymer Sci

View full text Add to dashboard Cite

Recently, considerable effort has been made to study cellulose/epoxy composites. However, there is a gap when it comes to understanding the post‐conditioning anomalous effect of moisture uptake on their mechanical and dynamic‐mechanical properties, and on their creep behavior. In this work, up to 10.0 wt% microcrystalline cellulose (MCC) was incorporated into epoxy resin by simple mixing and sonication. Epoxy/MCC composites were fabricated by casting in rubber silicone molds, and rectangular and dog‐bone test specimens were produced. The moisture uptake, dynamic mechanical, chemical, tensile, and creep behavior were evaluated. The incorporation of MCC increased the water diffusion coefficient. The changes in storage modulus and glass transition temperature, combined with Fourier‐transform infrared spectroscopy analysis, evidenced that water sorption in epoxies causes both plasticization and additional resin crosslinking, although the latter is prevented by the addition of MCC. The creep strain of the composites increased by 60% after conditioning, indicating that plasticization induced by water sorption plays an important role in the long‐term properties of the composites.

show abstract

Section: Resultssupporting

confidence: 80%

Section: Creep/recoverymentioning

confidence: 90%

Section: Dynamic Mechanical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations