For homogeneous nucleation, the crystal nucleus
is formed continuously by folded chain, resulting in crystals of great size.
Cold crystallization process makes the form of crystal nucleus
become easier, and the more crystal nucleus
is, the more crystal of PLLA is, resulting in the increasing of melting enthalpy.
2]O nucleation will induce the crystal nucleus to grow slowly and form bigger crystals.
At this point, pH of gel does not significantly influence the formation rate of crystal nucleus.
4] with highest concentration will react rapidly in the gel and the formation rate of crystal nucleus will be much greater, and vice versa.
Effectively it acts as a catalyst, clamping on to calcium carbonate particles to kickstart crystal formation and then dropping off when the crystal nucleus
is sufficiently large to grow under its own steam.
With increasing the PNA content, PNA provides crystal nucleus acting as heterogeneous nucleation and induces the crystallization, which contributes to the crystallization of PA6 in higher temperature.
The heterogeneous nucleation role of nucleating agents initiates more crystal nucleus and more molecular chains aligning into the lattices, which could be confirmed in the following POM observation in Fig.
The nucleating agent provides the molecular chains more crystal nucleus.
With the increase of isothermal crystallization temperature, the nucleation free energy increased, which made it difficult to form crystal nucleus and then led to the decrease of crystallization rate.
2] particles played the role of facilitating the crystallization of MC nylon-6 matrix mainly via accelerating the generation of crystal nucleus.
where [Kappa] is the Boltzman constant and W* is the change in free energy to form a crystal nucleus
of critical size.