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The effects of polydispersity on blo...
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Lynd, Nathaniel Alexander.
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The effects of polydispersity on block copolymer self-assembly .
紀錄類型:
書目-語言資料,印刷品 : Monograph/item
正題名/作者:
The effects of polydispersity on block copolymer self-assembly ./
作者:
Lynd, Nathaniel Alexander.
面頁冊數:
247 p.
附註:
Adviser: Marc A. Hillmyer.
Contained By:
Dissertation Abstracts International68-12B.
標題:
Chemistry, Polymer. -
電子資源:
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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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.
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