{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,23]],"date-time":"2025-12-23T10:34:54Z","timestamp":1766486094859,"version":"3.37.3"},"reference-count":14,"publisher":"Wiley","license":[{"start":{"date-parts":[[2016,1,1]],"date-time":"2016-01-01T00:00:00Z","timestamp":1451606400000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["International Journal of Analytical Chemistry"],"published-print":{"date-parts":[[2016]]},"abstract":"<jats:p>Potassium<jats:italic>t<\/jats:italic>-butoxide dissolved in tetrahydrofuran effectively initiates homogeneous polymerization of propylene oxide at room temperature. Unsaturation and molar mass (<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M1\"><mml:mrow><mml:msub><mml:mrow><mml:mi>M<\/mml:mi><\/mml:mrow><mml:mrow><mml:mi>n<\/mml:mi><\/mml:mrow><\/mml:msub><\/mml:mrow><\/mml:math>) of the polymers prepared depend on the presence of additives, such as macrocyclic ligand 18-crown-6 (L) and<jats:italic>t<\/jats:italic>-butanol. Application of the ligand alone results in distinct increase of unsaturation and decrease of<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M2\"><mml:mrow><mml:msub><mml:mrow><mml:mi>M<\/mml:mi><\/mml:mrow><mml:mrow><mml:mi>n<\/mml:mi><\/mml:mrow><\/mml:msub><\/mml:mrow><\/mml:math>, whereas use of<jats:italic>t<\/jats:italic>-BuOH leads to simultaneous decrease of unsaturation and<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M3\"><mml:mrow><mml:msub><mml:mrow><mml:mi>M<\/mml:mi><\/mml:mrow><mml:mrow><mml:mi>n<\/mml:mi><\/mml:mrow><\/mml:msub><\/mml:mrow><\/mml:math>. Activation of<jats:italic>t<\/jats:italic>-BuOK\/<jats:italic>t<\/jats:italic>-BuOH system with the ligand causes further decrease of unsaturation, that is, from 12.0 to 3.5\u2009mol % for OK\/OH (1\/3) and OK\/OH\/L (1\/3\/2) systems, respectively. Unexpectedly,<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M4\"><mml:mrow><mml:msub><mml:mrow><mml:mi>M<\/mml:mi><\/mml:mrow><mml:mrow><mml:mi>n<\/mml:mi><\/mml:mrow><\/mml:msub><\/mml:mrow><\/mml:math>of the polymers obtained does not practically change (~4800). This result differs from that reported earlier for neat PO polymerization initiated potassium 1-methoxy-2-propoxide\/1-methoxy-2-propanol, in which in the presence of the same ligand<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M5\"><mml:mrow><mml:msub><mml:mrow><mml:mi>M<\/mml:mi><\/mml:mrow><mml:mrow><mml:mi>n<\/mml:mi><\/mml:mrow><\/mml:msub><\/mml:mrow><\/mml:math>increases to ~12\u2009400 for the same ratio of reagents. The mechanism of studied processes was discussed.<\/jats:p>","DOI":"10.1155\/2016\/3727062","type":"journal-article","created":{"date-parts":[[2016,7,26]],"date-time":"2016-07-26T17:01:01Z","timestamp":1469552461000},"page":"1-6","source":"Crossref","is-referenced-by-count":3,"title":["The Influence of Crown Ether and Alcohol on Unsaturation and Molar Mass of Poly(propylene oxide)s Prepared by Use of Potassium<i>t<\/i>-Butoxide: Reinvestigation of Chain Transfer Reactions"],"prefix":"10.1155","volume":"2016","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7874-0231","authenticated-orcid":true,"given":"Zbigniew","family":"Grobelny","sequence":"first","affiliation":[{"name":"Institute of Chemistry, Faculty of Mathematics, Physics and Chemistry, University of Silesia in Katowice, 40-007 Katowice, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6116-9510","authenticated-orcid":true,"given":"Andrzej","family":"Swinarew","sequence":"additional","affiliation":[{"name":"Institute of Material Science, Faculty of Computer Science and Material Science, University of Silesia in Katowice, 40-007 Katowice, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Justyna","family":"Jurek-Suliga","sequence":"additional","affiliation":[{"name":"Institute of Material Science, Faculty of Computer Science and Material Science, University of Silesia in Katowice, 40-007 Katowice, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kinga","family":"Skrzeczyna","sequence":"additional","affiliation":[{"name":"Institute of Chemistry, Faculty of Mathematics, Physics and Chemistry, University of Silesia in Katowice, 40-007 Katowice, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jadwiga","family":"Gabor","sequence":"additional","affiliation":[{"name":"Institute of Material Science, Faculty of Computer Science and Material Science, University of Silesia in Katowice, 40-007 Katowice, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marta","family":"\u0141\u0119\u017cniak","sequence":"additional","affiliation":[{"name":"Institute of Material Science, Faculty of Computer Science and Material Science, University of Silesia in Katowice, 40-007 Katowice, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","reference":[{"key":"1","doi-asserted-by":"publisher","DOI":"10.1016\/s0927-7757(01)00902-5"},{"key":"2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcis.2004.04.035"},{"key":"3","doi-asserted-by":"publisher","DOI":"10.1002\/pi.907"},{"key":"4","doi-asserted-by":"publisher","DOI":"10.1038\/32856"},{"issue":"6645","key":"5","doi-asserted-by":"crossref","first-page":"860","DOI":"10.1038\/42218","volume":"388","year":"1997","journal-title":"Nature"},{"key":"6","doi-asserted-by":"publisher","DOI":"10.1016\/j.cattod.2007.10.107"},{"key":"7","doi-asserted-by":"publisher","DOI":"10.1016\/S0926-860X(01)00910-3"},{"year":"2005","key":"8"},{"key":"9","doi-asserted-by":"publisher","DOI":"10.1002\/actp.1982.010330107"},{"key":"10","doi-asserted-by":"publisher","DOI":"10.1002\/actp.1984.010350106"},{"key":"11","first-page":"1060","volume":"39","year":"1988","journal-title":"Revista de Chimie"},{"key":"12","doi-asserted-by":"publisher","DOI":"10.1016\/0014-3057(91)90029-n"},{"year":"1963","key":"13"},{"key":"14","doi-asserted-by":"publisher","DOI":"10.1016\/j.eurpolymj.2013.06.035"}],"container-title":["International Journal of Analytical Chemistry"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/downloads.hindawi.com\/journals\/ijac\/2016\/3727062.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/downloads.hindawi.com\/journals\/ijac\/2016\/3727062.xml","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/downloads.hindawi.com\/journals\/ijac\/2016\/3727062.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2017,6,24]],"date-time":"2017-06-24T15:15:18Z","timestamp":1498317318000},"score":1,"resource":{"primary":{"URL":"http:\/\/www.hindawi.com\/journals\/ijac\/2016\/3727062\/"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2016]]},"references-count":14,"alternative-id":["3727062","3727062"],"URL":"https:\/\/doi.org\/10.1155\/2016\/3727062","relation":{},"ISSN":["1687-8760","1687-8779"],"issn-type":[{"type":"print","value":"1687-8760"},{"type":"electronic","value":"1687-8779"}],"subject":[],"published":{"date-parts":[[2016]]}}}