Isothermal Crystallization Behavior of Poly(L-lactide)in Poly(L-lactide)-block-Poly(ethylene glycol)Diblock Copolymers (Record no. 43264)

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control field MX-MdCICY
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control field 20250625124730.0
040 ## - CATALOGING SOURCE
Transcribing agency CICY
090 ## - LOCALLY ASSIGNED LC-TYPE CALL NUMBER (OCLC); LOCAL CALL NUMBER (RLIN)
Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) B-9004
008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION
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245 10 - TITLE STATEMENT
Title Isothermal Crystallization Behavior of Poly(L-lactide)in Poly(L-lactide)-block-Poly(ethylene glycol)Diblock Copolymers
490 0# - SERIES STATEMENT
Volume/sequential designation Journal of Polymer Science: Part B: Polymer Physics, 44(17), p.2438-2448, 2006
520 3# - SUMMARY, ETC.
Summary, etc. The crystal unit-cell structures and the isothermal crystallization kinetics of poly(L-lactide)in biodegradable poly(L-lactide)-block-methoxy poly(ethylene glycol)(PLLA-b-MePEG)diblock copolymers have been analyzed by wide-angle X-ray diffraction and differential scanning calorimetry. In particular, the effects due to the presence of MePEG that is chemically connected to PLLA as well as the PLLA crystallization temperature TC are examined. Though we observe no variation of both the PLLA and MePEG crystal unit-cell structures with the block ratio between PLLA and MePEG and TC, the isothermal crystallization kinetics of PLLA is greatly influenced by the presence of MePEG that is connected to it. In particular, the equilibrium melting temperature of PLLA, Tm,PLLA o , significantly decreases in the diblock copolymers. When the TC is high so that the crystallization is controlled by nucleation, because of the decreasing Tm,PLLA o and thereafter the nucleation density with decreasing PLLA molecular weight, the crystallinity of PLLA also decreases with a decrease in the PLLA molecular weight. While, for the lower crystallization temperature regime controlled by the growth mechanism, the crystallizability of PLLA in copolymers is greater than that of pure PLLA. This suggests that the activation energy for the PLLA segment diffusing to the crystallization site decreases in the diblocks.
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element BLOCK COPOLYMERS
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element CRYSTALLIZATION
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element POLY(L-LACTIDE)
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Huang, C.I.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Tsai, S.H.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Chen, C.M.
856 40 - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier <a href="https://drive.google.com/file/d/1QYTuF1Y1umx4kDHmPNlILLjPlabjDB1X/view?usp=drivesdk">https://drive.google.com/file/d/1QYTuF1Y1umx4kDHmPNlILLjPlabjDB1X/view?usp=drivesdk</a>
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Source of classification or shelving scheme Clasificación local
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  Clasificación local     Ref1 CICY CICY Documento préstamo interbibliotecario 25.06.2025   B-9004 25.06.2025 25.06.2025 Documentos solicitados