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Synthesis and Characterization of Model Dumbbell Polymers.

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Title: Synthesis and Characterization of Model Dumbbell Polymers.
Authors: Merina Rajan1, Pascal V. Velthem1, Mingfu Zhang1, Donghyun Cho1, Taihyun Chang1, Uday S. Agarwal1, Christian Bailly1, K. E. George1, Piet J. Lemstra1
Source: Macromolecules. May2007, Vol. 40 Issue 9, p3080-3089. 10p.
Subjects: Polymers, Physical & theoretical chemistry, Cryoscopy, Molecular weights
Abstract: High molecular weight dumbbell shaped polymers were prepared by atom transfer radical polymerization (ATRP) to grow branches from repeat units of end blocks of a symmetric triblock copolymer. The triblock copolymer itself was prepared by polymer−polymer coupling of a commercially obtained ,-end functionalized polystyrene as central block with end-functionalized poly(chloromethylstyrene) that we synthesized by nitroxide-mediated polymerization. Temperature gradient interaction chromatography (TGIC) enabled the estimation of the terminal hydroxyl functionality of the high molecular weight ,-difunctional polystyrene as 75%. Size exclusion chromatography (SEC) and 1H NMR enabled the determination of molecular weights and verification of the structures of the intermediate and the cleaved products. Size exclusion chromatography coupled with light scattering (SEC-LS) and scanning force microscopy (SFM) were used to confirm that the desired dumbbell architecture was obtained. [ABSTRACT FROM AUTHOR]
Copyright of Macromolecules 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
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Header DbId: egs
DbLabel: Engineering Source
An: 25111004
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Synthesis and Characterization of Model Dumbbell Polymers.
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  Data: <searchLink fieldCode="JN" term="%22Macromolecules%22">Macromolecules</searchLink>. May2007, Vol. 40 Issue 9, p3080-3089. 10p.
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  Data: High molecular weight dumbbell shaped polymers were prepared by atom transfer radical polymerization (ATRP) to grow branches from repeat units of end blocks of a symmetric triblock copolymer. The triblock copolymer itself was prepared by polymer−polymer coupling of a commercially obtained ,-end functionalized polystyrene as central block with end-functionalized poly(chloromethylstyrene) that we synthesized by nitroxide-mediated polymerization. Temperature gradient interaction chromatography (TGIC) enabled the estimation of the terminal hydroxyl functionality of the high molecular weight ,-difunctional polystyrene as 75%. Size exclusion chromatography (SEC) and 1H NMR enabled the determination of molecular weights and verification of the structures of the intermediate and the cleaved products. Size exclusion chromatography coupled with light scattering (SEC-LS) and scanning force microscopy (SFM) were used to confirm that the desired dumbbell architecture was obtained. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Macromolecules 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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        Value: 10.1021/ma061926f
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        Text: English
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      – SubjectFull: Physical & theoretical chemistry
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      – SubjectFull: Cryoscopy
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      – SubjectFull: Molecular weights
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              Text: May2007
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              Y: 2007
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