Synthesis, Sequential Crystallization and Morphological Evolution of Well-Defined Star-Shaped Poly(ε-caprolactone)-b-poly(L-lactide) Block Copolymer

Well‐defined star‐shaped poly(ε‐caprolactone)‐b‐poly(L‐lactide) copolymers (PCL‐b‐PLLA) were synthesized via sequential block copolymerization, and their molecular weights and arm length ratio could be accurately controlled. Both differential scanning calorimetry and wide angle X‐ray diffraction ana...

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Published in	Macromolecular chemistry and physics Vol. 207; no. 5; pp. 554 - 562
Main Authors	Wang, Jing-Liang, Dong, Chang-Ming
Format	Journal Article
Language	English
Published	Weinheim WILEY-VCH Verlag 03.03.2006 WILEY‐VCH Verlag Wiley
Subjects	Applied sciences Crystallization Exact sciences and technology morphological evolution Organic polymers Physicochemistry of polymers Properties and characterization sequential block copolymerization sequential isothermal crystallization star-shaped PCL-b-PLLA Ring opening polymerization Lactone copolymer Lactic acid copolymer morphological evolution sequential block copolymerization sequential isothermal crystallization Experimental study Star copolymer Monodispersed polymer Melt crystallization Caprolactone copolymer Spherulites Morphology Preparation star-shaped PCL-b-PLLA Block copolymer Isothermal crystallization
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ISSN	1022-1352 1521-3935
DOI	10.1002/macp.200500546

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Abstract	Well‐defined star‐shaped poly(ε‐caprolactone)‐b‐poly(L‐lactide) copolymers (PCL‐b‐PLLA) were synthesized via sequential block copolymerization, and their molecular weights and arm length ratio could be accurately controlled. Both differential scanning calorimetry and wide angle X‐ray diffraction analysis indicated that the crystallization of both the PLLA and PCL blocks within the star‐shaped PCL‐b‐PLLA copolymer could be adjusted from the arm length of each block, and both blocks mutually influenced each other. The sequential isothermal crystallization process of both the PLLA and PCL blocks within the PCL‐b‐PLLA copolymers was directly observed with a polarized optical microscope, and the isothermal crystallization of the PCL segments was mainly templated by the existing spherulites of PLLA. Moreover, the PLLA blocks within the star‐shaped PCL‐b‐PLLA copolymer progressively changed from ordinary spherulites to banded spherulites when the arm length ratio of PCL to PLLA was increased while concentric spherulites were observed for the linear analog. Significantly, these novel spherulites with concentric or banded textures and the morphological evolution of the spherulites have been observed for the first time in the PCL‐b‐PLLA block copolymers.
AbstractList	Well‐defined star‐shaped poly(ε‐caprolactone)‐b‐poly(L‐lactide) copolymers (PCL‐b‐PLLA) were synthesized via sequential block copolymerization, and their molecular weights and arm length ratio could be accurately controlled. Both differential scanning calorimetry and wide angle X‐ray diffraction analysis indicated that the crystallization of both the PLLA and PCL blocks within the star‐shaped PCL‐b‐PLLA copolymer could be adjusted from the arm length of each block, and both blocks mutually influenced each other. The sequential isothermal crystallization process of both the PLLA and PCL blocks within the PCL‐b‐PLLA copolymers was directly observed with a polarized optical microscope, and the isothermal crystallization of the PCL segments was mainly templated by the existing spherulites of PLLA. Moreover, the PLLA blocks within the star‐shaped PCL‐b‐PLLA copolymer progressively changed from ordinary spherulites to banded spherulites when the arm length ratio of PCL to PLLA was increased while concentric spherulites were observed for the linear analog. Significantly, these novel spherulites with concentric or banded textures and the morphological evolution of the spherulites have been observed for the first time in the PCL‐b‐PLLA block copolymers. Well‐defined star‐shaped poly( ε ‐caprolactone)‐ b ‐poly( L ‐lactide) copolymers (PCL‐ b ‐PLLA) were synthesized via sequential block copolymerization, and their molecular weights and arm length ratio could be accurately controlled. Both differential scanning calorimetry and wide angle X‐ray diffraction analysis indicated that the crystallization of both the PLLA and PCL blocks within the star‐shaped PCL‐ b ‐PLLA copolymer could be adjusted from the arm length of each block, and both blocks mutually influenced each other. The sequential isothermal crystallization process of both the PLLA and PCL blocks within the PCL‐ b ‐PLLA copolymers was directly observed with a polarized optical microscope, and the isothermal crystallization of the PCL segments was mainly templated by the existing spherulites of PLLA. Moreover, the PLLA blocks within the star‐shaped PCL‐ b ‐PLLA copolymer progressively changed from ordinary spherulites to banded spherulites when the arm length ratio of PCL to PLLA was increased while concentric spherulites were observed for the linear analog. Significantly, these novel spherulites with concentric or banded textures and the morphological evolution of the spherulites have been observed for the first time in the PCL‐ b ‐PLLA block copolymers. magnified image
Author	Dong, Chang-Ming Wang, Jing-Liang
Author_xml	– sequence: 1 givenname: Jing-Liang surname: Wang fullname: Wang, Jing-Liang organization: Department of Polymer Science and Engineering, School of Chemistry and Chemical Technology, Shanghai Jiao Tong University, Shanghai 200240, P. R. China – sequence: 2 givenname: Chang-Ming surname: Dong fullname: Dong, Chang-Ming email: cmdong@sjtu.edu.cn organization: Department of Polymer Science and Engineering, School of Chemistry and Chemical Technology, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
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Keywords	Ring opening polymerization Lactone copolymer Lactic acid copolymer morphological evolution sequential block copolymerization sequential isothermal crystallization Experimental study Star copolymer Monodispersed polymer Melt crystallization Caprolactone copolymer Spherulites Morphology Preparation star-shaped PCL-b-PLLA Block copolymer Isothermal crystallization
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Snippet	Well‐defined star‐shaped poly(ε‐caprolactone)‐b‐poly(L‐lactide) copolymers (PCL‐b‐PLLA) were synthesized via sequential block copolymerization, and their... Well‐defined star‐shaped poly( ε ‐caprolactone)‐ b ‐poly( L ‐lactide) copolymers (PCL‐ b ‐PLLA) were synthesized via sequential block copolymerization, and...
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StartPage	554
SubjectTerms	Applied sciences Crystallization Exact sciences and technology morphological evolution Organic polymers Physicochemistry of polymers Properties and characterization sequential block copolymerization sequential isothermal crystallization star-shaped PCL-b-PLLA
Title	Synthesis, Sequential Crystallization and Morphological Evolution of Well-Defined Star-Shaped Poly(ε-caprolactone)-b-poly(L-lactide) Block Copolymer
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