Evaluation of matrix-assisted laser desorption ionization mass spectrometry for studying the sec-butyllithium and n-butyllithium initiated ring-opening polymerization of hexamethylcyclotrisiloxane (D3)
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| Title: | Evaluation of matrix-assisted laser desorption ionization mass spectrometry for studying the sec-butyllithium and n-butyllithium initiated ring-opening polymerization of hexamethylcyclotrisiloxane (D |
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| Authors: | Hawkridge, Adam M.1, Gardella Jr., Joseph A.1 gardella@acsu.buffalo.edu |
| Source: | Journal of the American Society for Mass Spectrometry. Feb2003, Vol. 14 Issue 2, p95. 7p. |
| Subjects: | Ionization (Atomic physics), Organolithium compounds |
| Abstract: | Matrix assisted laser desorption ionization (MALDI) was used to study the organolithium initiated ring-opening polymerization of hexamethylcyclotrisiloxane (D3) in a mixed solvent system. The mass spectral peak intensities were monitored to determine the effects of polymerization time, initiator concentration, and reaction temperature on the formation of the mono, di, and trisiloxanolate initiator species and the extent of chain redistribution. The three initiator species were formed by reacting n-butyllithium and sec-butyllithium with D3 in nonpolar solvent. The mass spectral results showed that sec-butyllithium and n-butyllithium form different populations of initiator species under the same conditions and that the measured mass spectral peak intensities do not accurately represent the population of siloxanolate initiator species prior to propagation. The changes in peak intensities were attributed to chain redistribution. [Copyright &y& Elsevier] |
| Copyright of Journal of the American Society for Mass Spectrometry is the property of American Chemical Society 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.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 9052859 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Evaluation of matrix-assisted laser desorption ionization mass spectrometry for studying the sec-butyllithium and n-butyllithium initiated ring-opening polymerization of hexamethylcyclotrisiloxane (D<subscript>3</subscript>) – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Hawkridge%2C+Adam+M%2E%22">Hawkridge, Adam M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Gardella+Jr%2E%2C+Joseph+A%2E%22">Gardella Jr., Joseph A.</searchLink><relatesTo>1</relatesTo><i> gardella@acsu.buffalo.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+the+American+Society+for+Mass+Spectrometry%22">Journal of the American Society for Mass Spectrometry</searchLink>. Feb2003, Vol. 14 Issue 2, p95. 7p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Ionization+%28Atomic+physics%29%22">Ionization (Atomic physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Organolithium+compounds%22">Organolithium compounds</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Matrix assisted laser desorption ionization (MALDI) was used to study the organolithium initiated ring-opening polymerization of hexamethylcyclotrisiloxane (D3) in a mixed solvent system. The mass spectral peak intensities were monitored to determine the effects of polymerization time, initiator concentration, and reaction temperature on the formation of the mono, di, and trisiloxanolate initiator species and the extent of chain redistribution. The three initiator species were formed by reacting n-butyllithium and sec-butyllithium with D3 in nonpolar solvent. The mass spectral results showed that sec-butyllithium and n-butyllithium form different populations of initiator species under the same conditions and that the measured mass spectral peak intensities do not accurately represent the population of siloxanolate initiator species prior to propagation. The changes in peak intensities were attributed to chain redistribution. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of the American Society for Mass Spectrometry is the property of American Chemical Society 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: 10.1016/S1044-0305(02)00806-1 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 95 Subjects: – SubjectFull: Ionization (Atomic physics) Type: general – SubjectFull: Organolithium compounds Type: general Titles: – TitleFull: Evaluation of matrix-assisted laser desorption ionization mass spectrometry for studying the sec-butyllithium and n-butyllithium initiated ring-opening polymerization of hexamethylcyclotrisiloxane (D3) Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Hawkridge, Adam M. – PersonEntity: Name: NameFull: Gardella Jr., Joseph A. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 02 Text: Feb2003 Type: published Y: 2003 Identifiers: – Type: issn-print Value: 10440305 Numbering: – Type: volume Value: 14 – Type: issue Value: 2 Titles: – TitleFull: Journal of the American Society for Mass Spectrometry Type: main |
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