Investigation of Effective Parameters on Self-Nucleation Phenomenon in Semi-Crystalline Polymers
The crystallinity of semi-crystalline polymers is affected by both nucleation and growth processes, and the nucleation phase controls the kinetics of crystallization. In general, there are two types of homogeneous and heterogeneous nucleation. Self-nucleation or memory effect is a type of homogeneou...
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| Published in: | Baspārish (Tihrān. Online) Vol. 12; no. 2; pp. 50 - 58 |
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| Main Authors: | , , , , |
| Format: | Journal Article |
| Language: | Persian |
| Published: |
Iran Polymer & Petrochemical Institute
01-08-2022
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | The crystallinity of semi-crystalline polymers is affected by both nucleation and growth processes, and the nucleation phase controls the kinetics of crystallization. In general, there are two types of homogeneous and heterogeneous nucleation. Self-nucleation or memory effect is a type of homogeneous nucleation. This phenomenon occurs when the crystal nuclei of the remaining polymer due to insufficient melting temperature or melting time in the next cooling stage lead to the acceleration of nucleation. Despite many researches on self-nucleation, the exact concept and the factors affecting self-nucleation still need to be studied. In this article, after introducing the phenomenon of self-nucleation and its phenomenology, measurement and the method of determining the domains of self-nucleation are introduced. Then, the factors affecting self-nucleation such as molecular mass, topology, and the structural constraints are discussed. Molecular mass and topology affect the stability of the nuclei and the memory effect by means of constraints resulting from the polymer entanglements. The confinements in polymer/nano-particle system and block copolymers caused by reduction of chain diffusion. In these systems, tethering of the chains to the surface of the nanoparticles or the constraint implemented by the two-ended covalent bonds led to the disappearance of the self-nucleation domain (domain 2) and hampering of memory effect. |
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| ISSN: | 2252-0449 2538-5445 |
| DOI: | 10.22063/basparesh.2021.2959.1572 |