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Copolymerization of Norbornene and Styrene with Anilinonaphthoquinone-Ligated Nickel Complexes
Poly(norbornene-co-styrene)s were synthesized by the use of anilinonaphthoquinone-ligated nickel complexes [Ni(C(10)H(5)O(2)NAr)(Ph)(PPh(3)): 1a, Ar = C(6)H(3)-2,6-(i)Pr; 1b, Ar = C(6)H(2)-2,4,6-Me; 1c, Ar = C(6)H(5)] activated with modified methylaluminoxane (MMAO) or B(C(6)F(5))(3) in toluene. The...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6680643/ https://www.ncbi.nlm.nih.gov/pubmed/31261797 http://dx.doi.org/10.3390/polym11071100 |
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author | Chowdhury, Samiul Islam Tanaka, Ryo Nakayama, Yuushou Shiono, Takeshi |
author_facet | Chowdhury, Samiul Islam Tanaka, Ryo Nakayama, Yuushou Shiono, Takeshi |
author_sort | Chowdhury, Samiul Islam |
collection | PubMed |
description | Poly(norbornene-co-styrene)s were synthesized by the use of anilinonaphthoquinone-ligated nickel complexes [Ni(C(10)H(5)O(2)NAr)(Ph)(PPh(3)): 1a, Ar = C(6)H(3)-2,6-(i)Pr; 1b, Ar = C(6)H(2)-2,4,6-Me; 1c, Ar = C(6)H(5)] activated with modified methylaluminoxane (MMAO) or B(C(6)F(5))(3) in toluene. The effects of the cocatalysts were more significant than those of the nickel complexes, and MMAO gave higher activity than B(C(6)F(5))(3). The structural characterizations of the products indicated the formation of statistical norbornene copolymers. An increase of the styrene ratio in feed led to an increase in the incorporated styrene (S) content of the resulting copolymer. The molecular weight of the copolymer decreased with increasing the S ratio in feed at 70 °C. The copolymerization activity, using MMAO as a cocatalyst, decreased with lowering of the temperature from 70 to 0 °C, accompanied by an increase in the molecular weight of the copolymer. The S incorporation up to 59% with M(n) of 78,000 was achieved by the 1b-B(C(6)F(5))(3) catalytic system. The glass transition temperatures of the norbornene (N)/S copolymers determined by differential scanning calorimetry, decreased from 329 to 128 °C according to the S content. |
format | Online Article Text |
id | pubmed-6680643 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-66806432019-08-09 Copolymerization of Norbornene and Styrene with Anilinonaphthoquinone-Ligated Nickel Complexes Chowdhury, Samiul Islam Tanaka, Ryo Nakayama, Yuushou Shiono, Takeshi Polymers (Basel) Article Poly(norbornene-co-styrene)s were synthesized by the use of anilinonaphthoquinone-ligated nickel complexes [Ni(C(10)H(5)O(2)NAr)(Ph)(PPh(3)): 1a, Ar = C(6)H(3)-2,6-(i)Pr; 1b, Ar = C(6)H(2)-2,4,6-Me; 1c, Ar = C(6)H(5)] activated with modified methylaluminoxane (MMAO) or B(C(6)F(5))(3) in toluene. The effects of the cocatalysts were more significant than those of the nickel complexes, and MMAO gave higher activity than B(C(6)F(5))(3). The structural characterizations of the products indicated the formation of statistical norbornene copolymers. An increase of the styrene ratio in feed led to an increase in the incorporated styrene (S) content of the resulting copolymer. The molecular weight of the copolymer decreased with increasing the S ratio in feed at 70 °C. The copolymerization activity, using MMAO as a cocatalyst, decreased with lowering of the temperature from 70 to 0 °C, accompanied by an increase in the molecular weight of the copolymer. The S incorporation up to 59% with M(n) of 78,000 was achieved by the 1b-B(C(6)F(5))(3) catalytic system. The glass transition temperatures of the norbornene (N)/S copolymers determined by differential scanning calorimetry, decreased from 329 to 128 °C according to the S content. MDPI 2019-06-28 /pmc/articles/PMC6680643/ /pubmed/31261797 http://dx.doi.org/10.3390/polym11071100 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Chowdhury, Samiul Islam Tanaka, Ryo Nakayama, Yuushou Shiono, Takeshi Copolymerization of Norbornene and Styrene with Anilinonaphthoquinone-Ligated Nickel Complexes |
title | Copolymerization of Norbornene and Styrene with Anilinonaphthoquinone-Ligated Nickel Complexes |
title_full | Copolymerization of Norbornene and Styrene with Anilinonaphthoquinone-Ligated Nickel Complexes |
title_fullStr | Copolymerization of Norbornene and Styrene with Anilinonaphthoquinone-Ligated Nickel Complexes |
title_full_unstemmed | Copolymerization of Norbornene and Styrene with Anilinonaphthoquinone-Ligated Nickel Complexes |
title_short | Copolymerization of Norbornene and Styrene with Anilinonaphthoquinone-Ligated Nickel Complexes |
title_sort | copolymerization of norbornene and styrene with anilinonaphthoquinone-ligated nickel complexes |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6680643/ https://www.ncbi.nlm.nih.gov/pubmed/31261797 http://dx.doi.org/10.3390/polym11071100 |
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