Isothermal and non-isothermal crystallization kinetics of polypropylene/exfoliated graphite nanocomposites

Flow-induced crystallization of polypropylene in the presence of graphene nanoplatelets and relevant mechanical properties in nanocompsoite fibres

“…This shows that PP/GnPs nanocomposite fibres at all three crystallization temperatures revealed a higher nucleation rate and high impingement between the crystals as compared to virgin PP, resulting in a large number of small spherulites and this finding was in complete agreement with crystallite size obtained from WAXD (Table 2). Similar change in morphology of crystallites of the PP matrix in the presence of exfoliated graphite [11,12] or other nucleating agents [53,54] was previously reported by other investigators. It is worth pointing out that the nucleation started around the GnPs as indicated for PP/G0.1 at 140°C in line with previous reported results by Kalaitzidou et al [10].…”

“…During the last decade, PP/graphene nanocomposites were studied extensively [2,[9][10][11][12][13][14][15][16]. These researches showed that the properties of nanocomposites, such as mechanical properties, are dependent on the state of dispersion of graphene in the matrix and loading amount of graphene.…”

Synthesis, characterization and crystallization kinetics of nanocomposites prepared by in situ polymerization of ethylene and graphene

“…Contrary to our results, the authors observed a decrease in the value of n, but this decrease was attributed to the growth of numerous spherulites at or near the rGO surface, which impinge with each other at early stages of crystallization and form a quasi-2D layer of spherulites [25]. Similarly, the nucleation effect of graphene and functionalized graphene has been reported for many other polymers, e.g., polypropylene [34,35] and polyphenylene sulfide [36]. Figure 7a-d shows the experimental and model-predicted relative crystallinity vs time.…”

Morphological, viscoelastic and mechanical characterization of polypropylene/exfoliated graphite nanocomposites

“…Previous studies [36] showed that exfoliated graphite can act as a nucleating agent to the crystallization of polypropylene and this effect only occur if the affinity between both exists. Eitan et al [37] observed the mechanism for improving the mechanical properties of the MWCNT/polycarbonate nanocomposites corresponds to the immobilization of the polymer chains at the surface of the nanofiller, and this effect is pronounced when the good dispersion is achieved.…”