MARC details
| 000 -LEADER |
|---|
| fixed length control field |
01782nam a2200313Ia 4500 |
| 003 - CONTROL NUMBER IDENTIFIER |
|---|
| control field |
MX-MdCICY |
| 005 - DATE AND TIME OF LATEST TRANSACTION |
|---|
| control field |
20250625160139.0 |
| 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-15824 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
|---|
| fixed length control field |
250602s9999 xx |||||s2 |||| ||und|d |
| 245 10 - TITLE STATEMENT |
|---|
| Title |
Dependence of the gas permeability of some polyimide isomers on their intrasegmental mobility |
| 490 0# - SERIES STATEMENT |
|---|
| Volume/sequential designation |
Journal of Membrane Science, 77(1), p.41-48, 1993 |
| 520 3# - SUMMARY, ETC. |
|---|
| Summary, etc. |
The polyimide PMDA-4,4'-ODA has a higher permeability and a lower selectivity toward H2, CO2, CH4, O2, and N2 than its isomer PMDA-3,3'-ODA. The differences in the gas permeability and selectivity are attributed to differences in the intrasegmental (rotational)mobility of PMDA-4,4'-ODA (the para-isomer)and of PMDA-3,3'-ODA (the meta-isomer). The phenyl rings in the para-isomer can rotate around their principal axis whereas such a rotation is not possible in the meta-isomer. This hypothesis is supported by dynamic mechanical analyses as well as by measurements of the CO2 diffusivity in the two isomers. Computer simulations indicate that rotation of the phenyl ring in the para-isomer is hindered by two larger rotational energy barriers of 4.0 and 2.4 kcal/mole, and two smaller ones of 1.3 kcal/mole. © 1993. |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
CARBON DIOXIDE |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
COMPUTER SIMULATION |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
DIFFUSION |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
HYDROGEN |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
MECHANICAL PERMEABILITY |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
METHANE |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
MOLECULAR STRUCTURE |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
NITROGEN |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
OXYGEN |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
POLYIMIDES |
| 700 12 - ADDED ENTRY--PERSONAL NAME |
|---|
| Personal name |
Mi, Y. |
| 700 12 - ADDED ENTRY--PERSONAL NAME |
|---|
| Personal name |
Stern, S.A. |
| 700 12 - ADDED ENTRY--PERSONAL NAME |
|---|
| Personal name |
Trohalaki, S. |
| 856 40 - ELECTRONIC LOCATION AND ACCESS |
|---|
| Uniform Resource Identifier |
<a href="https://drive.google.com/file/d/17ma_m0OSCBhVtTh5hIfsbRfyB2IjX34t/view?usp=drivesdk">https://drive.google.com/file/d/17ma_m0OSCBhVtTh5hIfsbRfyB2IjX34t/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 |
