Synthesis and characterization of polyamides X 18
| Autor: | Cuiming Yuan, Deyue Yan, Xiaowen Cui, Weihua Li, Giuseppe Di Silvestro |
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| Rok vydání: | 2005 |
| Předmět: |
Condensation polymer
Polymers and Plastics Chemistry Size-exclusion chromatography General Chemistry Degree of polymerization Surfaces Coatings and Films chemistry.chemical_compound symbols.namesake Diamine Amide Polyamide Polymer chemistry Materials Chemistry symbols Thermal stability Raman spectroscopy |
| Zdroj: | Journal of Applied Polymer Science. 98:1565-1571 |
| ISSN: | 1097-4628 0021-8995 |
| Popis: | Step heating melt polycondensation was adopted in the preparation of polyamides based on 1,16-octadecane diacid and α,ω(CH2)2n diamines (n = 1–6). The structure was confirmed by various spectroscopic techniques (IR, Raman, 1H-NMR, and 13C-NMR). High molecular masses were obtained only in the presence of an excess of diamine and when the diamine possessed low volatility. The molecular masses were between (0.94 and 2.1) × 104 Da for all polyamides under consideration. An excellent correlation between size exclusion chromatography and 1H-NMR data was demonstrated in the measurement of the degree of polymerization. The melting temperatures of the polyamides decreased from polyamide 12 18 to polyamide 2 18 as the amide density along the molecular chain declined. No significant variation was observed in the glass-transition and decomposition temperatures of the polyamides that were obtained. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 1565–1571, 2005 |
| Databáze: | OpenAIRE |
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