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Thermal and Structural Properties of Biologically Derived Monodisperse Hairy-Rod Polymers

Yu, Seung M. and Tirrell, David A. (2000) Thermal and Structural Properties of Biologically Derived Monodisperse Hairy-Rod Polymers. Biomacromolecules, 1 (3). pp. 310-312. ISSN 1525-7797. http://resolver.caltech.edu/CaltechAUTHORS:20150114-121449953

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Abstract

Monodisperse derivatives of poly(γ-4-(hexadecyloxy)benzyl α,l-glutamate) (PHBG-X, X = 3 or 4) with backbone sequence GluAsp(Glu_(17)Asp)_xGluGlu were prepared by reaction of 4-(hexadecyloxy)phenyldiazomethane with the corresponding monodisperse poly(α,l-glutamate) (PLGA) derivatives (PLGA-X, X = 3 or 4). PHBG-3 and -4 exhibited strong endotherms near 45 °C and weak endotherms near 86 °C when analyzed by differential scanning calorimetry. X-ray diffraction suggested that these polymers aggregate to form layerlike solid structures at room temperature, with extended alkyl side chains forming paraffinlike crystallites. Most of the side chain order disappears at the first melting transition; however, the layerlike structure remains. Both polymers are isotropic above the second melting transition; no ordered melts were observed at higher temperatures, possibly due to the small aspect ratios of PHBG-3 and -4. In contrast, polydisperse poly(γ-4-(hexadecyloxy)benzyl α,l-glutamate) (PDI = 1.2, DP = 98) (PHBG-P1), prepared from commercial PLGA, formed liquid crystalline (LC) phases between 97 and 105 °C.


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http://dx.doi.org/10.1021/bm000039wDOIArticle
http://pubs.acs.org/doi/abs/10.1021/bm000039wPublisherArticle
http://pubs.acs.org/doi/suppl/10.1021/bm000039wPublisherSupplemental material
ORCID:
AuthorORCID
Tirrell, David A.0000-0003-3175-4596
Additional Information:Copyright © 2000 American Chemical Society. Published In Issue September 12, 2000. Publication Date (Web): August 18, 2000. Received May 10, 2000. Acknowledgment. This work was supported by the National Science Foundation Materials Research Science and Engineering Center at the University of Massachusetts. Supporting Information Available. Text giving experimental details of the synthesis of PHBG and figures showing X-ray powder diffraction patterns for PHBG-4.
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National Science Foundation Materials Research Science and Engineering Center at the University of MassachusettsUNSPECIFIED
Record Number:CaltechAUTHORS:20150114-121449953
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150114-121449953
Official Citation: Thermal and Structural Properties of Biologically Derived Monodisperse Hairy-Rod Polymers Seungju M. Yu† and and David A. Tirrell* Biomacromolecules 2000 1 (3), 310-312
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53716
Collection:CaltechAUTHORS
Deposited By: Katherine Johnson
Deposited On:15 Jan 2015 18:35
Last Modified:15 Jan 2015 18:35

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