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Polymers 2018, 10(6), 577; https://doi.org/10.3390/polym10060577

Precise Synthesis, Properties, and Structures of Cyclic Poly(ε-caprolactone)s

1,†
,
1,†
,
2,* and 1,*
1
Department of Chemistry, Division of Advanced Materials Science, and Polymer Research Institute, Pohang University of Science and Technology, Pohang 37673, Korea
2
Department of Microbiology and Dongguk Medical Institute, Dongguk University College of Medicine, Gyeongju 38066, Korea
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 1 May 2018 / Revised: 18 May 2018 / Accepted: 22 May 2018 / Published: 23 May 2018
(This article belongs to the Special Issue Cyclic Polymers)
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Abstract

Cyclic PCL (c-PCL) has drawn great attention from academia and industry because of its unique, unusual structure and property characteristics due to the absence of end groups in addition to the biocompatibility and biodegradability of its linear analogue. As a result of much research effort, several synthetic methods have been developed to produce c-PCLs so far. Their chain, morphology and property characteristics were investigated even though carried out on a very limited basis. This feature article reviews the research progress made in the synthesis, morphology, and properties of c-PCL; all results and their pros and cons are discussed in terms of purity and molecular weight distribution in addition to the cyclic topology effect. In addition, we attempted to synthesize a series of c-PCL products of high purity by using intramolecular azido-alkynyl click cyclization chemistry and subsequent precise and controlled separation and purification; and their thermal degradation and phase transitions were investigated in terms of the cyclic topology effect. View Full-Text
Keywords: cyclic poly(ε-caprolactone); linear poly(ε-caprolactone); precise synthesis; thermal properties; hydrolytic degradation; crystallization; morphological structure cyclic poly(ε-caprolactone); linear poly(ε-caprolactone); precise synthesis; thermal properties; hydrolytic degradation; crystallization; morphological structure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Xiang, L.; Ryu, W.; Kim, H.; Ree, M. Precise Synthesis, Properties, and Structures of Cyclic Poly(ε-caprolactone)s. Polymers 2018, 10, 577.

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