New insights on the crystallization and melting of cyclic PCL chains on the basis of a modified Thomson–Gibbs equation

Su, Hsuan-Han; Chen, Hsin‐Lung; Díaz, Angélica; Casas, María Teresa; Puiggalı́, Jordi; Hoskins, Jessica N.; Grayson, Scott M.; Pérez, Ricardo; Müller, Alejandro J.

doi:10.1016/j.polymer.2012.11.066

Cited by 83 publications

(167 citation statements)

References 87 publications

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“…The most important findings of Su et al [47] were that the morphology of C-PCL and L-PCL single crystals was similar [59], but that there were differences in the degree of truncation and in the average lamellar thickness. Figure 1 presents selected TEM micrographs and electron diffraction patterns of linear and cyclic 5.1 kg/mol PCLs [47].…”

Section: Single Crystals Obtained From Solutionmentioning

confidence: 93%

“…Then, a bis-functional cyclization reaction is performed by Cu(I)-catalyzed azide-alkyne cycloaddition, leading to the cyclic polymer (C-PCL in Scheme 1) (more details are given in [47,48]). Normally, the chemical structure of the resulting linking unit (a triazole ring in this case) is different from the polymer repeating unit, although it is possible in some cases (e.g., for poly(tetrahydrofuran) cyclic materials), to transform the linking unit into a group identical to the repeating unit (see [40]).…”

Section: Types Of Cyclic Polymersmentioning

confidence: 99%

“…One of the advantages of crystallization from dilute solution is the minimal molecular diffusion hindrance and the lack of isothermal thickening during crystallization. Su et al [47] studied, for the first time, single crystals obtained from solutions of cyclic PCL samples and their linear counterparts.…”

Section: Types Of Cyclic Polymersmentioning

confidence: 99%

“…Su et al [47] prepared single crystals of linear and cyclic PCL samples by isothermal crystallization in dilute n-hexanol and N,N-dimethylacetamide solutions at temperatures of 40 C and 26 C, respectively. The samples were obtained by ring-closure techniques (see Scheme 1).…”

Section: Single Crystals Obtained From Solutionmentioning

confidence: 99%

“…Figure 1 presents selected TEM micrographs and electron diffraction patterns of linear and cyclic 5.1 kg/mol PCLs [47]. Figure 1a, c shows TEM micrographs in which the distorted hexagonal-shaped morphology of the lamellar crystals is observed.…”

Section: Single Crystals Obtained From Solutionmentioning

confidence: 99%

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Crystallization of Cyclic Polymers

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The effect of chain topology (ring versus linear polymer chains) on polymer crystallization is reviewed. Recent advances in ring closure and ring expansion synthetic techniques have made available a range of well-characterized samples with higher levels of purity than available decades ago. Cyclic molecules are fascinating because the structural difference between them and linear chains is relatively small, yet their behavior can be completely different from that of their linear analogs of identical chain length. The effect of having no chain ends can dramatically change the polymer coil conformation and diffusion rate, as well as the chain entanglement density in the melt. These changes are reflected in different nucleation and crystallization kinetics for cyclic and linear polymeric chains. However, the results published so far seem to be dependent on the type of polymer employed. Therefore, a careful look at the literature and evidence reported for each group of materials has been assembled and compared. The possible reasons for some of the contradictions in the evidence are also discussed.

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Section: Single Crystals Obtained From Solutionmentioning

confidence: 93%

Section: Types Of Cyclic Polymersmentioning

confidence: 99%

Section: Types Of Cyclic Polymersmentioning

confidence: 99%

Section: Single Crystals Obtained From Solutionmentioning

confidence: 99%

Section: Single Crystals Obtained From Solutionmentioning

confidence: 99%

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Polymer Crystallization

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Müller

2022

Macromolecular Engineering

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This article presents a brief summary of the basic concepts of polymer crystallization. This is a topic of great academic and practical interest. Polymer crystallization determines the properties of all semicrystalline polymeric materials, which constitute approximately 75% of all plastics commercially produced. Hence, understanding the nucleation, crystallization, and morphology of polymers is fundamental to tailoring their properties for specific applications. This brief review first introduces the way polymer chains crystallize and how they self‐assemble from solution and from the melt, highlighting their morphological complexity. Then, we discuss primary nucleation, flow‐induced nucleation, self‐nucleation, and crystal growth, with particular emphasis on kinetics and the existing theories to model nucleation, growth, and overall crystallization.

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New insights on the crystallization and melting of cyclic PCL chains on the basis of a modified Thomson–Gibbs equation

Cited by 83 publications

References 87 publications

Crystallization of Cyclic Polymers

Crystallization of Cyclic Polymers

Isothermal Crystallization Kinetics of Polymers

Polymer Crystallization

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