Structure and distribution of cross-links in boron-modified phenol-formaldehyde resins designed for soft magnetic composites: a multiple-quantum 11B-11B MAS NMR correlation spectroscopy study
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F15%3A00446681" target="_blank" >RIV/61389013:_____/15:00446681 - isvavai.cz</a>
Výsledek na webu
<a href="http://dx.doi.org/10.1021/acs.macromol.5b01037" target="_blank" >http://dx.doi.org/10.1021/acs.macromol.5b01037</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.macromol.5b01037" target="_blank" >10.1021/acs.macromol.5b01037</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Structure and distribution of cross-links in boron-modified phenol-formaldehyde resins designed for soft magnetic composites: a multiple-quantum 11B-11B MAS NMR correlation spectroscopy study
Popis výsledku v původním jazyce
Despite the extensive use of boron-modified phenol?formaldehyde polymers as insulating materials in soft magnetic composites (SMCs), the structure and arrangement of the inorganic cross-linking units in these systems have not been fully elucidated. To clarify the structure, configuration, and distribution of the boron cross-links in these materials, phenol?formaldehyde resins modified by boric acid were synthesized and characterized using advanced multiple-quantum 11B?11B MAS NMR correlation techniquescombined with the quantum chemical geometry optimizations and the subsequent 11B NMR chemical shielding calculations. The analyses of the resulting spectra revealed a well-evolved (high-density) phenol?formaldehyde polymer network additionally strengthened by nitrogen and boron cross-links. The boron-based cross-links were attributed to monoester (ca. 10%) and diester (ca. 90%) complexes (six-membered spirocyclic borate anions) with strictly tetrahedral coordination (BIV). During the the
Název v anglickém jazyce
Structure and distribution of cross-links in boron-modified phenol-formaldehyde resins designed for soft magnetic composites: a multiple-quantum 11B-11B MAS NMR correlation spectroscopy study
Popis výsledku anglicky
Despite the extensive use of boron-modified phenol?formaldehyde polymers as insulating materials in soft magnetic composites (SMCs), the structure and arrangement of the inorganic cross-linking units in these systems have not been fully elucidated. To clarify the structure, configuration, and distribution of the boron cross-links in these materials, phenol?formaldehyde resins modified by boric acid were synthesized and characterized using advanced multiple-quantum 11B?11B MAS NMR correlation techniquescombined with the quantum chemical geometry optimizations and the subsequent 11B NMR chemical shielding calculations. The analyses of the resulting spectra revealed a well-evolved (high-density) phenol?formaldehyde polymer network additionally strengthened by nitrogen and boron cross-links. The boron-based cross-links were attributed to monoester (ca. 10%) and diester (ca. 90%) complexes (six-membered spirocyclic borate anions) with strictly tetrahedral coordination (BIV). During the the
Klasifikace
Druh
J<sub>x</sub> - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
CEP obor
CD - Makromolekulární chemie
OECD FORD obor
—
Návaznosti výsledku
Projekt
<a href="/cs/project/LD14010" target="_blank" >LD14010: Anorganicko-organické hybridy s kontrolovaně řízenou strukturou</a><br>
Návaznosti
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2015
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Macromolecules
ISSN
0024-9297
e-ISSN
—
Svazek periodika
48
Číslo periodika v rámci svazku
14
Stát vydavatele periodika
US - Spojené státy americké
Počet stran výsledku
8
Strana od-do
4874-4881
Kód UT WoS článku
000358823300011
EID výsledku v databázi Scopus
2-s2.0-84937825477