The formation of polyethylene terephthalate by ester interchange. III. The kinetics of the redistribution reaction (Record no. 54473)
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| fixed length control field | 01880nam a2200169Ia 4500 |
| 003 - CONTROL NUMBER IDENTIFIER | |
| control field | MX-MdCICY |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20250625162447.0 |
| 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-20377 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 250602s9999 xx |||||s2 |||| ||und|d |
| 245 10 - TITLE STATEMENT | |
| Title | The formation of polyethylene terephthalate by ester interchange. III. The kinetics of the redistribution reaction |
| 490 0# - SERIES STATEMENT | |
| Volume/sequential designation | Die Makromolekulare Chemie: MacroMolecular Chemistry and Physics, 38(1), p.138-146, 1960 |
| 520 3# - SUMMARY, ETC. | |
| Summary, etc. | The so-called redistribution reaction between end-groups and chain bonds cannot be studied by the usual functional group analysis. A novel method for direct kinetic investigation of this reaction is presented and applied to a known low-polymeric polyethylene terephthalate free from monomer. During condensation polymerization the production of monomer is determined quantitatively through fractional vacuum sublimation. The contribution of reversible polycondensation to the monomer production is derived from the results of a previous kinetic study of the reversible polycondensation starting from the same precondensate. From the difference with the experimentally established monomer production, evaluation of the redistribution rate constant kr is possible. From the values of kr at 223 and 254°C. and activation energy of ?? 31 kcal./mole is calculated. At these temperatures kr is of the same order of magnitude as the rate constants of reversible polycondensation yet. At the normal manufacturing temperature of 280°C. redistribution proceeds considerably faster than polycondensation, thus rendering a rather quick restoration of a normal molecular size distribution if not present initially |
| 700 12 - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Challa, G. |
| 856 40 - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | <a href="https://drive.google.com/file/d/1S89g7TY7Y6GEtPSydI7rac4Vmb92ROw0/view?usp=drivesdk">https://drive.google.com/file/d/1S89g7TY7Y6GEtPSydI7rac4Vmb92ROw0/view?usp=drivesdk</a> |
| Public note | Para ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | Clasificación local |
| Koha item type | Documentos solicitados |
| Lost status | Source of classification or shelving scheme | Damaged status | Not for loan | Collection | Home library | Current library | Shelving location | Date acquired | Total checkouts | Full call number | Date last seen | Price effective from | Koha item type |
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| Clasificación local | Ref1 | CICY | CICY | Documento préstamo interbibliotecario | 25.06.2025 | B-20377 | 25.06.2025 | 25.06.2025 | Documentos solicitados |