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The effects of polydispersity on blo...

Lynd, Nathaniel Alexander.

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The effects of polydispersity on block copolymer self-assembly .

Record Type:	Language materials, printed : Monograph/item
Title/Author:	The effects of polydispersity on block copolymer self-assembly ./
Author:	Lynd, Nathaniel Alexander.
Description:	247 p.
Notes:	Adviser: Marc A. Hillmyer.
Contained By:	Dissertation Abstracts International68-12B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3294767
ISBN:	9780549397656

The effects of polydispersity on block copolymer self-assembly .
Lynd, Nathaniel Alexander.

The effects of polydispersity on block copolymer self-assembly . - 247 p.

Adviser: Marc A. Hillmyer.

Thesis (Ph.D.)--University of Minnesota, 2007.

Model controlled-polydispersity poly(ethylene-alt-propylene)- b-poly(D,L-lactide) (PEP-PLA) and polystyrene- b-polyisoprene (PS-PI) diblock copolymers were synthesized by a combination of ionic and pseudo-ionic polymerization mechanisms and used to investigate the effects of increased breadth in the molecular weight distribution on block copolymer self-assembly. Small-angle x-ray scattering and rheological measurements were carried out to characterize the morphological details of these self-assembled materials as a function of their polydispersity, interaction strengths, and compositions. A number of consequences of increased breadth in the molecular weight distribution emerged; the domain spacing of the ordered structures increased, changes in morphology occurred, and the segregation strength at the order-disorder transitions changed ((chiN) ODT), particularly for asymmetric block copolymers. The change in (chiN)ODT as the polydispersity was increased was found to be dependent on the block copolymer composition, e.g., for PEP-PLA and PS-PI at asymmetric compositions, when the polydispersity was increased in the minority component, (chiN) ODT decreased, whereas when the polydispersity was increased in the majority component, (chiN)ODT increased.

ISBN: 9780549397656Subjects--Topical Terms:

1018428
Chemistry, Polymer.

The effects of polydispersity on block copolymer self-assembly .
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020 $a 9780549397656
035 $a (UMI)AAI3294767
035 $a AAI3294767
040 $a UMI $c UMI
100 1 $a Lynd, Nathaniel Alexander. $3 1280779
245 1 4 $a The effects of polydispersity on block copolymer self-assembly .
300 $a 247 p.
500 $a Adviser: Marc A. Hillmyer.
500 $a Source: Dissertation Abstracts International, Volume: 68-12, Section: B, page: 8057.
502 $a Thesis (Ph.D.)--University of Minnesota, 2007.
520 $a Model controlled-polydispersity poly(ethylene-alt-propylene)- b-poly(D,L-lactide) (PEP-PLA) and polystyrene- b-polyisoprene (PS-PI) diblock copolymers were synthesized by a combination of ionic and pseudo-ionic polymerization mechanisms and used to investigate the effects of increased breadth in the molecular weight distribution on block copolymer self-assembly. Small-angle x-ray scattering and rheological measurements were carried out to characterize the morphological details of these self-assembled materials as a function of their polydispersity, interaction strengths, and compositions. A number of consequences of increased breadth in the molecular weight distribution emerged; the domain spacing of the ordered structures increased, changes in morphology occurred, and the segregation strength at the order-disorder transitions changed ((chiN) ODT), particularly for asymmetric block copolymers. The change in (chiN)ODT as the polydispersity was increased was found to be dependent on the block copolymer composition, e.g., for PEP-PLA and PS-PI at asymmetric compositions, when the polydispersity was increased in the minority component, (chiN) ODT decreased, whereas when the polydispersity was increased in the majority component, (chiN)ODT increased.
590 $a School code: 0130.
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0495
710 2 $a University of Minnesota. $b Chemistry. $3 1265998
773 0 $t Dissertation Abstracts International $g 68-12B.
790 $a 0130
790 1 0 $a Hillmyer, Marc A., $e advisor
790 1 0 $a Lodge, Timothy P. $e committee member
790 1 0 $a Morse, David C. $e committee member
790 1 0 $a Taton, T. Andrew $e committee member
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3294767