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Synthesis and characterization of fu...

Karikari, Afia Sarpong.

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Synthesis and characterization of functional biodegradable polyesters.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Synthesis and characterization of functional biodegradable polyesters./
作者:	Karikari, Afia Sarpong.
面頁冊數:	288 p.
附註:	Source: Dissertation Abstracts International, Volume: 67-02, Section: B, page: 0916.
Contained By:	Dissertation Abstracts International67-02B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3207968
ISBN:	9780542556159

Synthesis and characterization of functional biodegradable polyesters.
Karikari, Afia Sarpong.

Synthesis and characterization of functional biodegradable polyesters. - 288 p.

Source: Dissertation Abstracts International, Volume: 67-02, Section: B, page: 0916.

Thesis (Ph.D.)--Virginia Polytechnic Institute and State University, 2006.

The ring opening polymerization of D,L-lactide (DLLA) using multifunctional hydroxyl-terminated initiators and catalyst/coinitiator systems based on Sn(Oct)2 afforded the preparation of star-shaped, poly(D,L-lactide)s (PDLLA)s of controlled molar mass, narrow molar mass distributions, and well-defined chain end functionality. Various modifications of star-shaped PDLLA resulted in macromolecules with tailored functionalities for biomedical applications.

ISBN: 9780542556159Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Synthesis and characterization of functional biodegradable polyesters.
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100 1 $a Karikari, Afia Sarpong. $3 1919438
245 1 0 $a Synthesis and characterization of functional biodegradable polyesters.
300 $a 288 p.
500 $a Source: Dissertation Abstracts International, Volume: 67-02, Section: B, page: 0916.
500 $a Adviser: Timothy E. Long.
502 $a Thesis (Ph.D.)--Virginia Polytechnic Institute and State University, 2006.
520 $a The ring opening polymerization of D,L-lactide (DLLA) using multifunctional hydroxyl-terminated initiators and catalyst/coinitiator systems based on Sn(Oct)2 afforded the preparation of star-shaped, poly(D,L-lactide)s (PDLLA)s of controlled molar mass, narrow molar mass distributions, and well-defined chain end functionality. Various modifications of star-shaped PDLLA resulted in macromolecules with tailored functionalities for biomedical applications.
520 $a Star-shaped PDLLAs were modified to contain photoreactive methacrylate end groups and subsequent photo-crosslinking was performed. Photo-crosslinked networks based on methacrylated star-shaped PDLLAs exhibited thermal properties and mechanical performance that were superior to current approved clinical adhesives. In addition, the thermal and mechanical properties of the networks were strongly dependent on the composition and molar mass of the star-shaped PDLLA precursors. Tensile strengths in the range of 8-21 MPa were obtained while the Young's modulus increased from 12 to 354 MPa and were higher for networks based on urethane containing polymers.
520 $a Star-shaped PDLLAs bearing complementary adenine and thymine terminal units were also prepared. The hydrogen bonding associations between complementary PDLLA macromolecules depended strongly on molar mass and hence, the concentration of multiple hydrogen bonding units. 1H NMR spectroscopy confirmed the formation of hydrogen-bonded complexes with a 1:1 optimal stoichiometry and an association constant of 84 M-1. The hydrogen-bonded complexes also exhibited significantly higher solution viscosities than non-blended polymer solutions of similar molar mass and concentration.
520 $a Thermoreversible associations of PDLLA-based complementary polymers were observed in the melt phase and the melt viscosity of a blended complex was consistently an order of magnitude higher than non-functionalized star-shaped PDLLA of similar molar mass. Furthermore, melt electrospinning of the hydrogen-bonded complexes successfully resulted in fibers of significantly larger diameter (9.8 +/- 2.0 mum) compared to the individual precursors (PDLLA-A = 4.0 +/- 0.6 mum and PDLLA-T = 4.4 +/- 1.0 mum). These results suggested that thermoreversibility, as well as the strength of the hydrogen bonding interactions between the end groups of the tailored star-shaped PDLLA-based supramolecular polymers controlled the fiber diameter in the melt electrospinning process. (Abstract shortened by UMI.)
590 $a School code: 0247.
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0495
710 2 0 $a Virginia Polytechnic Institute and State University. $3 1017496
773 0 $t Dissertation Abstracts International $g 67-02B.
790 1 0 $a Long, Timothy E., $e advisor
790 $a 0247
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3207968