Polymers of carbonic acid, 5. Nematic polyurethanes derived from 4,4′‐dihydroxybiphenyl and 4,4′‐bipiperidine, ethylene‐4,4′‐bipiperidine or trimethylene‐4,4′‐bipiperidine
Abstract 4,4′‐Bipiperidine ( 3a ), 1,2‐bis(4‐piperidinyl)ethane ( 3b ) and 1,3‐bis(4‐piperidinyl)propane ( 3c ) were condensed with the dichloroformates of p ‐phenylene, 2‐methyl‐1,4‐phenylene or 2,5‐biphenylylene. Furthermore, two copolyurethanes were prepared either by mixing 3a and 3c or by mixin...
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crwiley:10.1002/macp.1989.021901024 2024-06-02T08:05:12+00:00 Polymers of carbonic acid, 5. Nematic polyurethanes derived from 4,4′‐dihydroxybiphenyl and 4,4′‐bipiperidine, ethylene‐4,4′‐bipiperidine or trimethylene‐4,4′‐bipiperidine Kricheldorf, Hans R. Awe, Jens 1989 http://dx.doi.org/10.1002/macp.1989.021901024 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fmacp.1989.021901024 https://onlinelibrary.wiley.com/doi/pdf/10.1002/macp.1989.021901024 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Die Makromolekulare Chemie volume 190, issue 10, page 2597-2608 ISSN 0025-116X 0025-116X journal-article 1989 crwiley https://doi.org/10.1002/macp.1989.021901024 2024-05-03T11:39:25Z Abstract 4,4′‐Bipiperidine ( 3a ), 1,2‐bis(4‐piperidinyl)ethane ( 3b ) and 1,3‐bis(4‐piperidinyl)propane ( 3c ) were condensed with the dichloroformates of p ‐phenylene, 2‐methyl‐1,4‐phenylene or 2,5‐biphenylylene. Furthermore, two copolyurethanes were prepared either by mixing 3a and 3c or by mixing the dichloroformates for p ‐phenylene and 2,5‐biphenylylene. Inherent viscosities between of 0,6 and 1,7 dl/g were found for the polyurethanes of 3c , but only values below 0,86 dl/g for those of 3a and 3b . The polyurethanes derived from hydroquinone or methylhydroquinone are semicrystalline polymers with a short‐term thermostability up to 310°C. The polyurethanes deriving from phenylhydroquinone are amorphous with a thermostability up to 360°C. The homo‐and copolyurethanes containing 4,4′‐biphenylylene units form a smectic layer structure in the solid state and a nematic melt above the melting point. Article in Journal/Newspaper Carbonic acid Wiley Online Library Die Makromolekulare Chemie 190 10 2597 2608 |
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English |
description |
Abstract 4,4′‐Bipiperidine ( 3a ), 1,2‐bis(4‐piperidinyl)ethane ( 3b ) and 1,3‐bis(4‐piperidinyl)propane ( 3c ) were condensed with the dichloroformates of p ‐phenylene, 2‐methyl‐1,4‐phenylene or 2,5‐biphenylylene. Furthermore, two copolyurethanes were prepared either by mixing 3a and 3c or by mixing the dichloroformates for p ‐phenylene and 2,5‐biphenylylene. Inherent viscosities between of 0,6 and 1,7 dl/g were found for the polyurethanes of 3c , but only values below 0,86 dl/g for those of 3a and 3b . The polyurethanes derived from hydroquinone or methylhydroquinone are semicrystalline polymers with a short‐term thermostability up to 310°C. The polyurethanes deriving from phenylhydroquinone are amorphous with a thermostability up to 360°C. The homo‐and copolyurethanes containing 4,4′‐biphenylylene units form a smectic layer structure in the solid state and a nematic melt above the melting point. |
format |
Article in Journal/Newspaper |
author |
Kricheldorf, Hans R. Awe, Jens |
spellingShingle |
Kricheldorf, Hans R. Awe, Jens Polymers of carbonic acid, 5. Nematic polyurethanes derived from 4,4′‐dihydroxybiphenyl and 4,4′‐bipiperidine, ethylene‐4,4′‐bipiperidine or trimethylene‐4,4′‐bipiperidine |
author_facet |
Kricheldorf, Hans R. Awe, Jens |
author_sort |
Kricheldorf, Hans R. |
title |
Polymers of carbonic acid, 5. Nematic polyurethanes derived from 4,4′‐dihydroxybiphenyl and 4,4′‐bipiperidine, ethylene‐4,4′‐bipiperidine or trimethylene‐4,4′‐bipiperidine |
title_short |
Polymers of carbonic acid, 5. Nematic polyurethanes derived from 4,4′‐dihydroxybiphenyl and 4,4′‐bipiperidine, ethylene‐4,4′‐bipiperidine or trimethylene‐4,4′‐bipiperidine |
title_full |
Polymers of carbonic acid, 5. Nematic polyurethanes derived from 4,4′‐dihydroxybiphenyl and 4,4′‐bipiperidine, ethylene‐4,4′‐bipiperidine or trimethylene‐4,4′‐bipiperidine |
title_fullStr |
Polymers of carbonic acid, 5. Nematic polyurethanes derived from 4,4′‐dihydroxybiphenyl and 4,4′‐bipiperidine, ethylene‐4,4′‐bipiperidine or trimethylene‐4,4′‐bipiperidine |
title_full_unstemmed |
Polymers of carbonic acid, 5. Nematic polyurethanes derived from 4,4′‐dihydroxybiphenyl and 4,4′‐bipiperidine, ethylene‐4,4′‐bipiperidine or trimethylene‐4,4′‐bipiperidine |
title_sort |
polymers of carbonic acid, 5. nematic polyurethanes derived from 4,4′‐dihydroxybiphenyl and 4,4′‐bipiperidine, ethylene‐4,4′‐bipiperidine or trimethylene‐4,4′‐bipiperidine |
publisher |
Wiley |
publishDate |
1989 |
url |
http://dx.doi.org/10.1002/macp.1989.021901024 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fmacp.1989.021901024 https://onlinelibrary.wiley.com/doi/pdf/10.1002/macp.1989.021901024 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
Die Makromolekulare Chemie volume 190, issue 10, page 2597-2608 ISSN 0025-116X 0025-116X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/macp.1989.021901024 |
container_title |
Die Makromolekulare Chemie |
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190 |
container_issue |
10 |
container_start_page |
2597 |
op_container_end_page |
2608 |
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1800749977765412864 |