New Insights in the Synthesis of High-Molecular-Weight Aromatic Polyamides-Improved Synthesis of Rod-like PPTA
By employing a variation of the polyamidation method using in situ silylated diamines and acid chlorides, it was possible to obtain a rod-type polyamide: poly(<i>p</i>-phenylene terephthalamide) (PPTA, a polymer used in the high-value-added material Kevlar), with a molecular weight much...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | International Journal of Molecular Sciences |
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| Online Access: | https://www.mdpi.com/1422-0067/24/3/2734 |
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| author | Guiomar Hernández Sergio Ferrero Helmut Reinecke Camino Bartolomé Jesús M. Martinez-Ilarduya Cristina Álvarez Ángel E. Lozano |
| author_facet | Guiomar Hernández Sergio Ferrero Helmut Reinecke Camino Bartolomé Jesús M. Martinez-Ilarduya Cristina Álvarez Ángel E. Lozano |
| author_sort | Guiomar Hernández |
| collection | DOAJ |
| description | By employing a variation of the polyamidation method using in situ silylated diamines and acid chlorides, it was possible to obtain a rod-type polyamide: poly(<i>p</i>-phenylene terephthalamide) (PPTA, a polymer used in the high-value-added material Kevlar), with a molecular weight much higher than that obtained with the classical and industrial polyamidation method. The optimization of the method has consisted of using, together with the silylating agent, a mixture of pyridine and a high-pKa tertiary amine. The research was complemented by a combination of nuclear magnetic resonance and molecular simulation studies, which determined that the improvements in molecular weight derive mainly from the formation of silylamide groups in the growing polymer. |
| first_indexed | 2024-03-11T09:40:48Z |
| format | Article |
| id | doaj.art-597683b648ed429ea82bbf2474270045 |
| institution | Directory Open Access Journal |
| issn | 1661-6596 1422-0067 |
| language | English |
| last_indexed | 2024-03-11T09:40:48Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | International Journal of Molecular Sciences |
| spelling | doaj.art-597683b648ed429ea82bbf24742700452023-11-16T17:01:32ZengMDPI AGInternational Journal of Molecular Sciences1661-65961422-00672023-02-01243273410.3390/ijms24032734New Insights in the Synthesis of High-Molecular-Weight Aromatic Polyamides-Improved Synthesis of Rod-like PPTAGuiomar Hernández0Sergio Ferrero1Helmut Reinecke2Camino Bartolomé3Jesús M. Martinez-Ilarduya4Cristina Álvarez5Ángel E. Lozano6Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC, E-28006 Madrid, SpainIU CINQUIMA, Universidad de Valladolid, E-47011 Valladolid, SpainInstituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC, E-28006 Madrid, SpainIU CINQUIMA, Universidad de Valladolid, E-47011 Valladolid, SpainIU CINQUIMA, Universidad de Valladolid, E-47011 Valladolid, SpainInstituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC, E-28006 Madrid, SpainInstituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC, E-28006 Madrid, SpainBy employing a variation of the polyamidation method using in situ silylated diamines and acid chlorides, it was possible to obtain a rod-type polyamide: poly(<i>p</i>-phenylene terephthalamide) (PPTA, a polymer used in the high-value-added material Kevlar), with a molecular weight much higher than that obtained with the classical and industrial polyamidation method. The optimization of the method has consisted of using, together with the silylating agent, a mixture of pyridine and a high-pKa tertiary amine. The research was complemented by a combination of nuclear magnetic resonance and molecular simulation studies, which determined that the improvements in molecular weight derive mainly from the formation of silylamide groups in the growing polymer.https://www.mdpi.com/1422-0067/24/3/2734polyamidationin situ silylationpoly(<i>p</i>-phenylene terephthalamide) (PPTA)KevlarNMRDFT molecular simulation |
| spellingShingle | Guiomar Hernández Sergio Ferrero Helmut Reinecke Camino Bartolomé Jesús M. Martinez-Ilarduya Cristina Álvarez Ángel E. Lozano New Insights in the Synthesis of High-Molecular-Weight Aromatic Polyamides-Improved Synthesis of Rod-like PPTA International Journal of Molecular Sciences polyamidation in situ silylation poly(<i>p</i>-phenylene terephthalamide) (PPTA) Kevlar NMR DFT molecular simulation |
| title | New Insights in the Synthesis of High-Molecular-Weight Aromatic Polyamides-Improved Synthesis of Rod-like PPTA |
| title_full | New Insights in the Synthesis of High-Molecular-Weight Aromatic Polyamides-Improved Synthesis of Rod-like PPTA |
| title_fullStr | New Insights in the Synthesis of High-Molecular-Weight Aromatic Polyamides-Improved Synthesis of Rod-like PPTA |
| title_full_unstemmed | New Insights in the Synthesis of High-Molecular-Weight Aromatic Polyamides-Improved Synthesis of Rod-like PPTA |
| title_short | New Insights in the Synthesis of High-Molecular-Weight Aromatic Polyamides-Improved Synthesis of Rod-like PPTA |
| title_sort | new insights in the synthesis of high molecular weight aromatic polyamides improved synthesis of rod like ppta |
| topic | polyamidation in situ silylation poly(<i>p</i>-phenylene terephthalamide) (PPTA) Kevlar NMR DFT molecular simulation |
| url | https://www.mdpi.com/1422-0067/24/3/2734 |
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