Thermal degradation of polypropylene (Record no. 54072)
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| 000 -LEADER | |
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| fixed length control field | 02047nam a2200193Ia 4500 |
| 003 - CONTROL NUMBER IDENTIFIER | |
| control field | MX-MdCICY |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20250625162440.0 |
| 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-19967 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 250602s9999 xx |||||s2 |||| ||und|d |
| 245 10 - TITLE STATEMENT | |
| Title | Thermal degradation of polypropylene |
| 490 0# - SERIES STATEMENT | |
| Volume/sequential designation | Journal of Polymer Science, 56(164), p.485-499, 1962 |
| 520 3# - SUMMARY, ETC. | |
| Summary, etc. | The molecular weight distributions of polypropylene samples subjected to various degrees of thermal degradation were experimentally determined and compared with those expected theoretically for random scission of the polymer chains. The comparison demonstrated that the chain breakage is predominately random and also indicates that current methods of determining molecular weight distributions are adequate for use in evaluating hypothesized degradation mechanisms. In terms of the free radical depolymerization theory, intermolecular transfer of the radical is the dominant process. A curve relating the degree of degradation to the intrinsic viscosity was obtained from calculations based upon a random degradation. With this curve, intrinsic viscosities measured as a function of degradation time could be used to obtain the time dependence of the degree of degradation. The observed degradation rates could not be described by a simple process in which the rate of bond rupture was proportional to the number of bonds present. Neither a similar process involving two bond types nor a dependence of the free radical diffusion rate upon the degree of degradation was by itself a satisfactory basis for interpreting the kinetics. The activation energy estimated for the polypropylene degradation at 250-300°C. was not significantly different from that determined by volatilization measurements at higher temperatures. |
| 700 12 - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Davis, T. E. |
| 700 12 - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Tobias, R. L. |
| 700 12 - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Peterli, E. B. |
| 856 40 - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | <a href="https://drive.google.com/file/d/1kzp5IHlHLeQnoeXQxQ1anb7fiw0yky3-/view?usp=drivesdk">https://drive.google.com/file/d/1kzp5IHlHLeQnoeXQxQ1anb7fiw0yky3-/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-19967 | 25.06.2025 | 25.06.2025 | Documentos solicitados |