Copoly(γ,dl-glutamate)s containing short and long linear alkyl side chains
Saved in:
| Title: | Copoly(γ,dl-glutamate)s containing short and long linear alkyl side chains |
|---|---|
| Authors: | Morillo, M.1, Martínez de Ilarduya, A.1, Muñoz-Guerra, S. sebastian.munoz@upc.es |
| Source: | Polymer. Dec2003, Vol. 44 Issue 25, p7557. 8p. |
| Subjects: | Copolymers, Glutamic acid, Alkylation, Ethyl bromide, Spectrum analysis |
| Abstract: | Copoly(α-alkyl γ,dl-glutamate)s containing octadecyl and ethyl side groups were prepared from racemic poly(γ,dl-glutamic acid) of bacterial origin, and their structure in the solid state examined by DSC, polarized IR spectroscopy and X-ray diffraction methods. Copolymers with a blocky microstructure were prepared by transesterification of poly(α-ethyl γ,dl-glutamate) with octadecanol for a wide range of compositions. Random copolymers were prepared by sequential alkylation of the polyacid with ethyl bromide and octadecyl bromide in solution. All the multiblock copolymers were found to adopt the layered structure characteristic of comb-like polypeptides with the octadecyl side chains crystallized in extended conformation in a separate phase, and aligned normal to the main chains, which are arranged in helical conformation. Melting of paraffinic crystallites reversibly happened in the 50–55 °C range without significant alteration of the layered arrangement. Upon heating at 150 °C, the structure contracted but no indication on the existence of a second transition, as it is known to occur in comb-like poly(α-alkyl γ-glutamate) homopolymers, was observed by DSC. Random copolymers did show nor thermal transition neither evidence of any organized supramolecular structure. [Copyright &y& Elsevier] |
| Copyright of Polymer is the property of Elsevier B.V. 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 |
|---|---|
| Header | DbId: egs DbLabel: Engineering Source An: 11250964 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
| IllustrationInfo | |
| Items | – Name: Title Label: Title Group: Ti Data: Copoly(γ,dl-glutamate)s containing short and long linear alkyl side chains – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Morillo%2C+M%2E%22">Morillo, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Martínez+de+Ilarduya%2C+A%2E%22">Martínez de Ilarduya, A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Muñoz-Guerra%2C+S%2E%22">Muñoz-Guerra, S.</searchLink><i> sebastian.munoz@upc.es</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Polymer%22">Polymer</searchLink>. Dec2003, Vol. 44 Issue 25, p7557. 8p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Copolymers%22">Copolymers</searchLink><br /><searchLink fieldCode="DE" term="%22Glutamic+acid%22">Glutamic acid</searchLink><br /><searchLink fieldCode="DE" term="%22Alkylation%22">Alkylation</searchLink><br /><searchLink fieldCode="DE" term="%22Ethyl+bromide%22">Ethyl bromide</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrum+analysis%22">Spectrum analysis</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Copoly(α-alkyl γ,dl-glutamate)s containing octadecyl and ethyl side groups were prepared from racemic poly(γ,dl-glutamic acid) of bacterial origin, and their structure in the solid state examined by DSC, polarized IR spectroscopy and X-ray diffraction methods. Copolymers with a blocky microstructure were prepared by transesterification of poly(α-ethyl γ,dl-glutamate) with octadecanol for a wide range of compositions. Random copolymers were prepared by sequential alkylation of the polyacid with ethyl bromide and octadecyl bromide in solution. All the multiblock copolymers were found to adopt the layered structure characteristic of comb-like polypeptides with the octadecyl side chains crystallized in extended conformation in a separate phase, and aligned normal to the main chains, which are arranged in helical conformation. Melting of paraffinic crystallites reversibly happened in the 50–55 °C range without significant alteration of the layered arrangement. Upon heating at 150 °C, the structure contracted but no indication on the existence of a second transition, as it is known to occur in comb-like poly(α-alkyl γ-glutamate) homopolymers, was observed by DSC. Random copolymers did show nor thermal transition neither evidence of any organized supramolecular structure. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Polymer is the property of Elsevier B.V. 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.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=11250964 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.polymer.2003.10.001 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 8 StartPage: 7557 Subjects: – SubjectFull: Copolymers Type: general – SubjectFull: Glutamic acid Type: general – SubjectFull: Alkylation Type: general – SubjectFull: Ethyl bromide Type: general – SubjectFull: Spectrum analysis Type: general Titles: – TitleFull: Copoly(γ,dl-glutamate)s containing short and long linear alkyl side chains Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Morillo, M. – PersonEntity: Name: NameFull: Martínez de Ilarduya, A. – PersonEntity: Name: NameFull: Muñoz-Guerra, S. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2003 Type: published Y: 2003 Identifiers: – Type: issn-print Value: 00323861 Numbering: – Type: volume Value: 44 – Type: issue Value: 25 Titles: – TitleFull: Polymer Type: main |
| ResultId | 1 |
