Catalysis of cure reaction of ɛ-caprolactam-blocked polyisocyanate with diol using non-tin catalysts.
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| Title: | Catalysis of cure reaction of ɛ-caprolactam-blocked polyisocyanate with diol using non-tin catalysts. |
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| Authors: | Libni, G.1, Ali, B. Mohamad1, Sathiyaraj, S.1, Nasar, A. Sultan1 drasultannasar@yahoo.com, drasultannasar@unom.ac.in |
| Source: | Journal of Macromolecular Science: Pure & Applied Chemistry. 2018, Vol. 55 Issue 7, p552-558. 7p. 3 Diagrams, 5 Charts, 3 Graphs. |
| Subjects: | Isocyanates, Butanediol, Caprolactam, Catalysis, Curing, Bismuth compounds, Organometallic compounds, Molecular weights |
| Abstract: | Catalysis of cure reaction of ɛ-caprolactam-blocked polyisocyanate with 1,4-butane diol in the presence of DABCO - a tertiary amine, tin(II) 2-ethylhexanoate and non-tin organometallics like bismuth neodecanoate, calcium(II) 2-ethylhexanoate and zinc(II) 2-ethylhexanoate was investigated. The activity of these catalysts was studied by the determination of cure-time (gel-time) and analysis of absolute molecular weight of cured polymers. Cure-time results indicated that all the non-tin organometallics act as catalysts; they were more active than DABCO and except bismuth neodecanoate, other two non-tin compounds were also found to be equally active or more active than tin(II) 2-ethylhexanoate. Within the three organometallics studied, zinc (II) 2-ethylhexanoate showed highest catalytic activity, it reduced the cure-time more than 50% compared to the uncatalysed reaction. In the case of bismuth neodecanoate catalysed reaction, it was found that the viscosity was build-up to a certain limit and then decreased; this catalyst assisted chain degradation was confirmed by the analysis of molecular weight of polymers as a function of time. Catalytically active new species was formed when mixing the solution of DABCO to the solution of zinc (II) 2-ethylhexanoate and this formation was confirmed using FT-IR and UV-visible spectroscopy, but this species not showed synergism. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Macromolecular Science: Pure & Applied Chemistry is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 132271399 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Catalysis of cure reaction of ɛ-caprolactam-blocked polyisocyanate with diol using non-tin catalysts. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Libni%2C+G%2E%22">Libni, G.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ali%2C+B%2E+Mohamad%22">Ali, B. Mohamad</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Sathiyaraj%2C+S%2E%22">Sathiyaraj, S.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Nasar%2C+A%2E+Sultan%22">Nasar, A. Sultan</searchLink><relatesTo>1</relatesTo><i> drasultannasar@yahoo.com, drasultannasar@unom.ac.in</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Macromolecular+Science%3A+Pure+%26+Applied+Chemistry%22">Journal of Macromolecular Science: Pure & Applied Chemistry</searchLink>. 2018, Vol. 55 Issue 7, p552-558. 7p. 3 Diagrams, 5 Charts, 3 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Isocyanates%22">Isocyanates</searchLink><br /><searchLink fieldCode="DE" term="%22Butanediol%22">Butanediol</searchLink><br /><searchLink fieldCode="DE" term="%22Caprolactam%22">Caprolactam</searchLink><br /><searchLink fieldCode="DE" term="%22Catalysis%22">Catalysis</searchLink><br /><searchLink fieldCode="DE" term="%22Curing%22">Curing</searchLink><br /><searchLink fieldCode="DE" term="%22Bismuth+compounds%22">Bismuth compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Organometallic+compounds%22">Organometallic compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+weights%22">Molecular weights</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Catalysis of cure reaction of ɛ-caprolactam-blocked polyisocyanate with 1,4-butane diol in the presence of DABCO - a tertiary amine, tin(II) 2-ethylhexanoate and non-tin organometallics like bismuth neodecanoate, calcium(II) 2-ethylhexanoate and zinc(II) 2-ethylhexanoate was investigated. The activity of these catalysts was studied by the determination of cure-time (gel-time) and analysis of absolute molecular weight of cured polymers. Cure-time results indicated that all the non-tin organometallics act as catalysts; they were more active than DABCO and except bismuth neodecanoate, other two non-tin compounds were also found to be equally active or more active than tin(II) 2-ethylhexanoate. Within the three organometallics studied, zinc (II) 2-ethylhexanoate showed highest catalytic activity, it reduced the cure-time more than 50% compared to the uncatalysed reaction. In the case of bismuth neodecanoate catalysed reaction, it was found that the viscosity was build-up to a certain limit and then decreased; this catalyst assisted chain degradation was confirmed by the analysis of molecular weight of polymers as a function of time. Catalytically active new species was formed when mixing the solution of DABCO to the solution of zinc (II) 2-ethylhexanoate and this formation was confirmed using FT-IR and UV-visible spectroscopy, but this species not showed synergism. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Macromolecular Science: Pure & Applied Chemistry is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1080/10601325.2018.1481346 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 552 Subjects: – SubjectFull: Isocyanates Type: general – SubjectFull: Butanediol Type: general – SubjectFull: Caprolactam Type: general – SubjectFull: Catalysis Type: general – SubjectFull: Curing Type: general – SubjectFull: Bismuth compounds Type: general – SubjectFull: Organometallic compounds Type: general – SubjectFull: Molecular weights Type: general Titles: – TitleFull: Catalysis of cure reaction of ɛ-caprolactam-blocked polyisocyanate with diol using non-tin catalysts. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Libni, G. – PersonEntity: Name: NameFull: Ali, B. Mohamad – PersonEntity: Name: NameFull: Sathiyaraj, S. – PersonEntity: Name: NameFull: Nasar, A. Sultan IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: 2018 Type: published Y: 2018 Identifiers: – Type: issn-print Value: 10601325 Numbering: – Type: volume Value: 55 – Type: issue Value: 7 Titles: – TitleFull: Journal of Macromolecular Science: Pure & Applied Chemistry Type: main |
| ResultId | 1 |
