Morphological behaviour of poly(lactic acid)during hydrolytic degradation (Record no. 46578)

MARC details
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fixed length control field 02482nam a2200253Ia 4500
003 - CONTROL NUMBER IDENTIFIER
control field MX-MdCICY
005 - DATE AND TIME OF LATEST TRANSACTION
control field 20250625153851.0
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-12370
008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION
fixed length control field 250602s9999 xx |||||s2 |||| ||und|d
245 10 - TITLE STATEMENT
Title Morphological behaviour of poly(lactic acid)during hydrolytic degradation
490 0# - SERIES STATEMENT
Volume/sequential designation Polymer Degradation and Stability, 93(10), p.1964-1970, 2008
520 3# - SUMMARY, ETC.
Summary, etc. The hydrolytic degradation and the morphological behaviour of a packaging grade of poly(lactic acid)(PLA)were characterized by a series of techniques. During the initial degradation process (stage 1)at a temperature near the glass transition temperature (Tg), the molecular weight of PLA decreased as degradation time increased following a bulk erosion mechanism while the crystallinity increased simultaneously, but no observable weight loss occurred at stage 1. Mainly a-form PLA crystal structure was formed for the crystalline PLA with a low content of D stereo-isomers, but the material displayed a lower regularity, smaller domain size, lower melting temperatures Tm and different motional dynamics as compared to the original PLA with a similar level of crystallinity achieved by annealing. The amorphous PLA with a higher amount of D stereo-isomers also yielded the a crystalline phase as well as stereo-complex crystals at stage 1. When the molecular weight and the crystallinity reached a stable level, PLA started erosion into the degrading aqueous medium. During this stage of degradation (stage 2), the crystalline structure in PLA residues was further modified and both pH and temperature influenced the modification. The degradation at stage 2 was likely to follow a surface erosion mechanism with lactic acid as the major product of the weight loss. Besides the crystallinity effect on the degradation, temperature also played a key role in determining the rate of PLA degradation in both stages. The process was very slow at temperatures below the Tg of PLA but the rate was greatly enhanced at temperatures above the Tg.
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element POLY(LACTIC ACID)
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element HYDROLYTIC DEGRADATION
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element MORPHOLOGICAL BEHAVIOUR
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element BIODEGRADABLE POLYMER
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Zhang, X.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Espiritu, M.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Bilyk, A.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Kurniawan, L.
856 40 - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier <a href="https://drive.google.com/file/d/18R3l-UbfI0angHY_6pJf53pcUHnioHEz/view?usp=drivesdk">https://drive.google.com/file/d/18R3l-UbfI0angHY_6pJf53pcUHnioHEz/view?usp=drivesdk</a>
Public note Para ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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Source of classification or shelving scheme Clasificación local
Koha item type Documentos solicitados
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  Clasificación local     Ref1 CICY CICY Documento préstamo interbibliotecario 25.06.2025   B-12370 25.06.2025 25.06.2025 Documentos solicitados