Polymers of carbonic acid, 4. Crystalline smectic polyurethanes derived from piperazine or 4,4′‐bipiperidine and diphenols containing aliphatic spacers
Abstract 4,4′‐Alkylenedioxydiphenols ( 3a–e ), prepared from α,ω‐dibromoalkanes and hydroquinone, were converted with phosgen to the corresponding dichloroformates 4a–e , which were reacted with piperazine, trans ‐2,5‐dimethylpiperazine or 4,4′‐bipiperidine under the conditions of interfacial conden...
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crwiley:10.1002/macp.1989.021901023 2024-06-02T08:05:11+00:00 Polymers of carbonic acid, 4. Crystalline smectic polyurethanes derived from piperazine or 4,4′‐bipiperidine and diphenols containing aliphatic spacers Kricheldorf, Hans R. Awe, Jens 1989 http://dx.doi.org/10.1002/macp.1989.021901023 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fmacp.1989.021901023 https://onlinelibrary.wiley.com/doi/pdf/10.1002/macp.1989.021901023 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Die Makromolekulare Chemie volume 190, issue 10, page 2579-2595 ISSN 0025-116X 0025-116X journal-article 1989 crwiley https://doi.org/10.1002/macp.1989.021901023 2024-05-03T12:02:02Z Abstract 4,4′‐Alkylenedioxydiphenols ( 3a–e ), prepared from α,ω‐dibromoalkanes and hydroquinone, were converted with phosgen to the corresponding dichloroformates 4a–e , which were reacted with piperazine, trans ‐2,5‐dimethylpiperazine or 4,4′‐bipiperidine under the conditions of interfacial condensation. The DSC measurements of polyurethanes derived from 2,5‐dimethylpiperazine displayed one endotherm indicating a normal melting process, whereas the polyurethanes derived from piperazine or 4,4′‐bipiperidine showed a reversible first order phase transition below the melting point. WAXS powder patterns indicate a change between two different smectic modifications. Thermomechanical analyses (penetration method) proved that also the high‐temperature smectic modification is a solid state and not a liquid‐crystalline one. Article in Journal/Newspaper Carbonic acid Wiley Online Library Die Makromolekulare Chemie 190 10 2579 2595 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract 4,4′‐Alkylenedioxydiphenols ( 3a–e ), prepared from α,ω‐dibromoalkanes and hydroquinone, were converted with phosgen to the corresponding dichloroformates 4a–e , which were reacted with piperazine, trans ‐2,5‐dimethylpiperazine or 4,4′‐bipiperidine under the conditions of interfacial condensation. The DSC measurements of polyurethanes derived from 2,5‐dimethylpiperazine displayed one endotherm indicating a normal melting process, whereas the polyurethanes derived from piperazine or 4,4′‐bipiperidine showed a reversible first order phase transition below the melting point. WAXS powder patterns indicate a change between two different smectic modifications. Thermomechanical analyses (penetration method) proved that also the high‐temperature smectic modification is a solid state and not a liquid‐crystalline one. |
format |
Article in Journal/Newspaper |
author |
Kricheldorf, Hans R. Awe, Jens |
spellingShingle |
Kricheldorf, Hans R. Awe, Jens Polymers of carbonic acid, 4. Crystalline smectic polyurethanes derived from piperazine or 4,4′‐bipiperidine and diphenols containing aliphatic spacers |
author_facet |
Kricheldorf, Hans R. Awe, Jens |
author_sort |
Kricheldorf, Hans R. |
title |
Polymers of carbonic acid, 4. Crystalline smectic polyurethanes derived from piperazine or 4,4′‐bipiperidine and diphenols containing aliphatic spacers |
title_short |
Polymers of carbonic acid, 4. Crystalline smectic polyurethanes derived from piperazine or 4,4′‐bipiperidine and diphenols containing aliphatic spacers |
title_full |
Polymers of carbonic acid, 4. Crystalline smectic polyurethanes derived from piperazine or 4,4′‐bipiperidine and diphenols containing aliphatic spacers |
title_fullStr |
Polymers of carbonic acid, 4. Crystalline smectic polyurethanes derived from piperazine or 4,4′‐bipiperidine and diphenols containing aliphatic spacers |
title_full_unstemmed |
Polymers of carbonic acid, 4. Crystalline smectic polyurethanes derived from piperazine or 4,4′‐bipiperidine and diphenols containing aliphatic spacers |
title_sort |
polymers of carbonic acid, 4. crystalline smectic polyurethanes derived from piperazine or 4,4′‐bipiperidine and diphenols containing aliphatic spacers |
publisher |
Wiley |
publishDate |
1989 |
url |
http://dx.doi.org/10.1002/macp.1989.021901023 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fmacp.1989.021901023 https://onlinelibrary.wiley.com/doi/pdf/10.1002/macp.1989.021901023 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
Die Makromolekulare Chemie volume 190, issue 10, page 2579-2595 ISSN 0025-116X 0025-116X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/macp.1989.021901023 |
container_title |
Die Makromolekulare Chemie |
container_volume |
190 |
container_issue |
10 |
container_start_page |
2579 |
op_container_end_page |
2595 |
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1800749968219176960 |