Dependence of rheological behaviors of polymeric composites on the morphological structure of carbonaceous nanoparticles

Abstract

Carbonaceous nanoparticles (CNPs), including carbon black, carbon nanotubes, and graphene nanopiece, were selected as nanoadditives for investigating the rheological behavior dependence of their polymer-based composites on morphological and interfacial structure. Polypropylene (PP) was adopted as matrix and a series of contents of CNPs were used for sample compounding. With identical concentration, the morphological structure of CNPs was emphasized as the dominant effect affecting the shear viscosity and the compressibility of PP/CNPs melts. The viscosity dependence on the CNPs contents and physical structure, such as particle size, aspect ratio, and specific area, was fully discussed in this work. The newly-introduced inner voids, induced around the interface region between matrix and CNPs during physical mixing, were contributive to the rheological deviation, which was further reflected from the melt compressibility.

Dynamically Cross-Linked Tannin as a Reinforcement of Polypropylene and UV Protection Properties

“…A similar trend is also observed in storage modulus (Figure 4b). At low ω, PP/TH composites show a significant increase of G′, which is common in filled polymer system [42,43,44]. This suggests that the presence of cross-linked tannin in the matrix reinforces the internal network structure, enhancing the storage modulus and reduce the deformation degree under a low ω.…”

“…However, PP/TH composites present a more solid-like response than PP at low frequency because of the reinforcement of TH in the PP matrix. Unlike tannin-based epoxy resin that behaves like a plasticizer in a PVC matrix [26], cross-linked TH in a PP matrix behaves more like an organic filled PP, for instance, silica reinforced PP [44] and plate-like carbonaceous particles reinforced PP [42].…”

A one‐step method to manufacture biodegradable poly (butylene adipate‐co‐terephthalate) bead foam parts

“…The elasticity of PBAT‐PLA had little change compared with neat PBAT in the same test condition. Complex viscosity ( η * ) can reflect the strength of the melt to some extent 41,42 . As shown in Figure 3B, PBAT and PBAT‐PLA both presented the classical shear thinning behavior with an increase of shear rate.…”

“…However, the complex viscosity of PBAT‐PLA was about 1% higher than that of PBAT all the time, which indicated the addition of the PLA may slightly enhance the melt strength of the blend system. Fortunately, the high melt strength is beneficial for cell growth and cell structure support during the foaming process to some extent 42 …”

One-pot ball-milling preparation of graphene/carbon black aqueous inks for highly conductive and flexible printed electronics

“…When the mass ratio of GSs increases slightly, the effective volume fraction increases significantly, as the GSs hinder the flow of CB particles during shearing, causing an increase in viscosity. In addition, the inks produce a three-stage flow curve: when the shear rate is less than 0.1 s −1 (region I), the viscosity of G/C-0 decreases slower than that of the CB/ GSs composite inks, which may be because large CB aggregates can resist small external deformation, while the added graphene is sensitive to external deformation [39]. At intermediate shear rates, the viscosity of G/C-0 declines more rapidly than the viscosity of the CB/GSs composite conductive inks (region II).…”