Isothermal crystallization kinetics of isotactic polypropylene with inorganic fullerene-like WS2 nanoparticles

Isothermal Crystallization Kinetics of Novel Isotactic Polypropylene/MoS2 Inorganic Nanotube Nanocomposites

“…Five strong peaks at 2θ of 14º, 16.7º, 18.5º and 21.7º corresponding to (110), (040), (130) and (111) planes can be seen in the corresponding to the (300)-plane of the trigonal structure was observed [24]. Similar behaviour was observed for other iPP nanocomposites containing quasi-spherical inorganic fullerene-like WS 2 nanoparticles [20].…”

“…Similar behaviour was observed for iPP nanocomposites incorporating nucleating agents [31][32][33], nano-sized fillers (e.g. IF-WS 2 [20] or MWCNT [19,34]) and different types of fibers where transcrystallization takes place [35,36]. In particular, Marco et al [34] have also observed a progressive decrease in the fold surface free energy associated with the isothermal crystallization of iPP in iPP/MWCNT nanocomposites up to a nanotube concentration of 1%.…”

“…2 can also be rewritten as follows: [18]. In our case, the increase in the n exponent with increasing the INT-MoS 2 content can be attributed to a change from the instantaneous nucleation to sporadic nucleation with three-dimensional crystal growth [19] or increasing of the dimension of the crystal growth from two-dimensional to three-dimensional crystal growth assuming that the nucleation is homogenous [20].…”

Isothermal crystallization and melting behavior of polypropylene with lanthanum complex of cyclodextrin derivative as a β‐nucleating agent

“…However, the value of n reported in the literatures doesn't always match the Avrami equation and shows noninteger, which is caused by some characteristics of polymers, such as secondary crystallization process, mixed nucleation modes, and the change in material density. 34 Besides, some experimental factors, such as an error introduced in the determination of zero point of crystallization and the melting residence time can lead to noninteger values of n . 34, 35 In the current work, a value of n of 2.59 ± 0.23 obtained for pure iPP over the crystallization temperature range, was in agreement with Refs.…”

“…34 Besides, some experimental factors, such as an error introduced in the determination of zero point of crystallization and the melting residence time can lead to noninteger values of n . 34, 35 In the current work, a value of n of 2.59 ± 0.23 obtained for pure iPP over the crystallization temperature range, was in agreement with Refs. 21 and 34 and the obtained value of n attributed to a homogenous nucleation with two‐dimensional growth.…”