Hello every one,
I have seen somewhere that there is a critical size for ceramic additive particles (specifically BG) for making composite with semicrystalline polymer (specifically PCL). Above that size, the polymer's crystallinity increases and below that size, the polymer's crystallinity decreases. Is there any reference describing or proving this phenomenon?
Dear Majid Sohrabian, not only size that affect the crystallization kinetics, also shape and concentration (sometimes refered as saturation):
https://www.researchgate.net/publication/258806171_On_the_Effect_of_Particle_Size_Shape_Concentration_and_Aggregation_on_the_Flow-Induced_Crystallization_of_Polymers
The fourth parameter include any imposed work/stress on the system: flow, mixing, pressure.
- For many systems, submicron to low micrometer scales (e.g., 0.1–5 µm) are often ideal for nucleation. This ensures adequate surface area and compatibility with the polymer matrix.
- Nanoparticles (
The critical particle size of additives for the crystallization of semi-crystalline polymers depends on several factors, including the polymer's crystallization kinetics, the interfacial interactions between the additive and the polymer matrix, and the type of crystallization (homogeneous or heterogeneous nucleation).
Yes, there are studies indicating that the size of bioactive glass (BG) particles incorporated into polycaprolactone (PCL) matrices can influence the crystallinity of the polymer. Specifically, the effect varies with particle size:
- Larger Particles (>45 µm): Incorporation of larger BG particles has been associated with an increase in PCL crystallinity. This enhancement is attributed to the particles acting as nucleating agents, promoting the formation of crystalline regions within the polymer matrix.SpringerLink
- Smaller Particles (
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