Полимеризация олигомеров молочной кислоты в условиях микроволнового облучения
| Parent link: | Перспективы развития фундаментальных наук=Prospects of Fundamental Sciences Development: сборник научных трудов XIV Международной конференции студентов, аспирантов и молодых ученых, г. Томск, 25-28 апреля 2017 г./ Национальный исследовательский Томский политехнический университет (ТПУ) ; под ред. И. А. Курзиной, Г. А. Вороновой.— , 2017 Т. 2 : Химия.— 2017.— [С. 247-249] |
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| Summary: | Заглавие с экрана First studied the effect of the power and time for the polymerization of lactic acid oligomers (OLA) in the presence of catalysts D,L-α-alanine (α-Ala), D,L-β-alanine (β-Ala), D, L-β-phenyl-α-alanine (β-Phe-α-Ala), aminoacetic acid (Gly) and toluenesulfonic acid (TSA). It is found that the catalytic activity is studied at amino acid 280 W power varies among: β-Phe-α-Ala> Gly> α-Ala> β-Ala. A more effective catalyst is tert-butyl alcohol (t-BS.) compared with benzyl alcohol (BzS). Polymerization of OLA in the presence of TSA at a noticeable rate occurs already at 130 watts. Adding an electron-donor molecules (water, DMSO, benzyl alcohol) to TSA results in lower molecular weight PLA. It is suggested that the presence of so-called "microwave effect" when OLA polymerization in the presence of alanine and TSA, i.e at the same temperature (215 ° C) and the time at different powers (280, 360 W) OLA polymerization proceeds at different rates. |
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2017
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| Online Access: | http://earchive.tpu.ru/handle/11683/42656 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=623776 |
| Summary: | Заглавие с экрана First studied the effect of the power and time for the polymerization of lactic acid oligomers (OLA) in the presence of catalysts D,L-α-alanine (α-Ala), D,L-β-alanine (β-Ala), D, L-β-phenyl-α-alanine (β-Phe-α-Ala), aminoacetic acid (Gly) and toluenesulfonic acid (TSA). It is found that the catalytic activity is studied at amino acid 280 W power varies among: β-Phe-α-Ala> Gly> α-Ala> β-Ala. A more effective catalyst is tert-butyl alcohol (t-BS.) compared with benzyl alcohol (BzS). Polymerization of OLA in the presence of TSA at a noticeable rate occurs already at 130 watts. Adding an electron-donor molecules (water, DMSO, benzyl alcohol) to TSA results in lower molecular weight PLA. It is suggested that the presence of so-called "microwave effect" when OLA polymerization in the presence of alanine and TSA, i.e at the same temperature (215 ° C) and the time at different powers (280, 360 W) OLA polymerization proceeds at different rates. |
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