MARC details
| 000 -LEADER |
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| fixed length control field |
02208nam a2200253Ia 4500 |
| 003 - CONTROL NUMBER IDENTIFIER |
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| control field |
MX-MdCICY |
| 005 - DATE AND TIME OF LATEST TRANSACTION |
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| control field |
20250625160205.0 |
| 040 ## - CATALOGING SOURCE |
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| Transcribing agency |
CICY |
| 090 ## - LOCALLY ASSIGNED LC-TYPE CALL NUMBER (OCLC); LOCAL CALL NUMBER (RLIN) |
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| Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) |
B-17164 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
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| fixed length control field |
250602s9999 xx |||||s2 |||| ||und|d |
| 245 10 - TITLE STATEMENT |
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| Title |
Viscoelastic relaxations and thermal properties of bacterial poly (3-hydroxybutyrate-co-3-hydroxyvalerate)and poly (3-hydroxybutyrate-co-4-hydroxybutyrate) |
| 490 0# - SERIES STATEMENT |
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| Volume/sequential designation |
International Journal of Biological Macromolecules, 12(2), p.112-117, 1990 |
| 520 3# - SUMMARY, ETC. |
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| Summary, etc. |
3-Hydroxybutyrate-3-hydroxyvalerate (3HB-3HV)as well as 3-hydroxybutyrate-4-hydroxybutyrate (3HB-4HB)copolyesters have been investigated by differential scanning calorimetry, thermogravimetric analysis and dynamic mechanical spectroscopy, over a wide range of compositions (0-95 mol percent 3HV; 0-82 mol percent 4HB). Both series of isolated copolyesters are partially crystalline at all compositions. Quenched samples show a glass transition that decreases linearly with increasing co-monomer molar fraction, more markedly when the co-monomer is 4HB. Above Tg, all copolyesters, rich in 3HB units, show a cold crystallization phenomenon followed by melting, while at the other end crystallization on heating is observed only in 3HB-3HV copolymers. The viscoelastic spectrum, strongly affected by thermal history, shows two relaxation regions; the glass transition, whose location depends on copolymer type and composition, and a secondary dispersion region at low temperatures (?130?80°C). The latter results from a water-related relaxation analogous to that of P(3HB)and, in 3HB-4HB copolymers, from another overlapping absorption peak centred at ?130°C, attributed to local motion of the methylene groups in the linear 4HB units. |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
POLY(3-HYDROXYBUTYRATE-3-HYDROXYVALERATE) |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
POLY(3-HYDROXYBUTYRATE-4-HYDROXYBUTYRATE) |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
BIOPOLYMERS |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
VISCOELASTICITY |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
THERMAL PROPERTIES |
| 700 12 - ADDED ENTRY--PERSONAL NAME |
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| Personal name |
Scandola, M. |
| 700 12 - ADDED ENTRY--PERSONAL NAME |
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| Personal name |
Ceccorulli, G. |
| 700 12 - ADDED ENTRY--PERSONAL NAME |
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| Personal name |
Doi, Y. |
| 856 40 - ELECTRONIC LOCATION AND ACCESS |
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| Uniform Resource Identifier |
<a href="https://drive.google.com/file/d/1R7-jScBophMcQYVtdhOAvfQW4DAhcebe/view?usp=drivesdk">https://drive.google.com/file/d/1R7-jScBophMcQYVtdhOAvfQW4DAhcebe/view?usp=drivesdk</a> |
| Public note |
Para ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) |
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| Source of classification or shelving scheme |
Clasificación local |
| Koha item type |
Documentos solicitados |
