دورية أكاديمية
Factors influencing catalytic behavior of titanium complexes bearing bisphenolate ligands toward ring-opening polymerization of L-lactide and ε-caprolactone
| العنوان: | Factors influencing catalytic behavior of titanium complexes bearing bisphenolate ligands toward ring-opening polymerization of L-lactide and ε-caprolactone |
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| المؤلفون: | M-T. Jiang, S. R. Kosuru, Y. H. Lee, W-Y. Lu, J. K. Vandavasi, Y-C. Lai, M. Y. Chiang, H-Y. Chen |
| المصدر: | eXPRESS Polymer Letters, Vol 12, Iss 2, Pp 126-135 (2018) |
| بيانات النشر: | Budapest University of Technology, 2018. |
| سنة النشر: | 2018 |
| المجموعة: | LCC:Materials of engineering and construction. Mechanics of materials LCC:Chemical technology |
| مصطلحات موضوعية: | Biodegradable polymers, polycaprolactone, ring-opening polymerization, polylactide, Materials of engineering and construction. Mechanics of materials, TA401-492, Chemical technology, TP1-1185 |
| الوصف: | A series of titanium complexes bearing substituted diphenolate ligands (RCH(phenolate)2, where R = H, CH3, o-OTs-phenyl, o-F-phenyl, o-OMe-phenyl, 2,4-OMe-phenyl) was synthesized and studied as catalysts for the ring opening polymerization of L-lactide and ε-caprolactone. Ligands were designed to probe the role of chelate effect and steric effect in the catalytic performance. From the structure of triphenolate (with one extra coordination site than diphenolate ligand) Ti complex, TriOTiOiPr2, we found no additional chelation to influence the catalytic activity of Ti complexes. It was found that bulky aryl groups in the diphenolate ligands decreased the rate of polymerization most. We conclude that steric effect is the most controlling factor in these polymerization reactions by using Ti complexes bearing diphenolate ligands as catalysts since it is responsible for the exclusion of needed space for incoming monomer by the bulky substituents on the catalyst. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1788-618X |
| Relation: | http://www.expresspolymlett.com/letolt.php?file=EPL-0008645&mi=cd; https://doaj.org/toc/1788-618X |
| DOI: | 10.3144/expresspolymlett.2018.11 |
| URL الوصول: | https://doaj.org/article/2f344eb21ad843dab52494d664b2ce21 |
| رقم الأكسشن: | edsdoj.2f344eb21ad843dab52494d664b2ce21 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 1788618X |
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| DOI: | 10.3144/expresspolymlett.2018.11 |