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Your search keyword '"Muñoz Guerra, Sebastián"' showing total 17 results
Start Over Author "Muñoz Guerra, Sebastián" Journal macromolecular chemistry and physics
17 results on '"Muñoz Guerra, Sebastián"'

16. Polycondensation of L-Lysine Diketopiperazine with Tartaric Acid - Evidence on the Formation of Cyclic Oligomers

Author

Majó, Maria Antònia, Bou, Jordi J., Herranz, Concepción, and Muñoz-Guerra, Sebastián

Abstract

Summary: Reaction of active esters of O-protected D-and L-tartaric acid with L-lysine 2,5-diketopiperazine afforded optically active low molecular weight compounds with Tg ≈ 130 °C. 13C NMR results indicated that the condensation product consisted of cyclic oligomers made from 1 to 6 repeating units. Mass spectrometric analysis by MALDI-TOF ascertained such interpretation and suggested a revision of previous work reporting on polymerization of 2,5-diketopiperazines.MALDI-TOF profile of cKT-LL.

Published
2006
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17. On the Phase B of Comb-Like Poly(α-alkyl-β-<SC>L</SC>-aspartate)s: A Simulation of the Solubility of Small Penetrants

Author

Zanuy, David, Alemán, Carlos, López-Carrasquero, Francisco, Báez, María Eugenia, García-Alvarez, Montserrat, Laso, Manuel, and Muñoz-Guerra, Sebastián

Abstract

The structure and thermal properties of the phase B of poly(α-alkyl-β-L-aspartate)s, abbreviated PAALA-n (n being the number of carbon atoms in the linear alkyl side chain), with n = 14 and 16 were determined using X-ray diffraction and DSC methods, respectively. These data together with those previously reported by us for the dodecyl derivative were used to perform Monte Carlo simulations of these comb-like polymers. The results allowed to predict the solubility of different gases in the phase B of PAALA-n. The variation of both the unoccupied space and the excess chemical potential with the size of the penetrant were computed. An attractive interaction between the polymer matrix and the penetrants was found when small gases were considered. The results have been compared with those recently obtained for crystalline poly(α-alkyl-β-L-aspartate)s bearing short linear alkyl side chains.

Published
2001
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