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Thermodynamic and dynamic behaviors ...

Zhao, Yiqiang.

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Thermodynamic and dynamic behaviors of self-organizing polymeric systems.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Thermodynamic and dynamic behaviors of self-organizing polymeric systems./
作者:	Zhao, Yiqiang.
面頁冊數:	270 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-07, Section: B, page: 3442.
Contained By:	Dissertation Abstracts International65-07B.
標題:	Chemistry, Analytical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3141147
ISBN:	0496882811

Thermodynamic and dynamic behaviors of self-organizing polymeric systems.
Zhao, Yiqiang.

Thermodynamic and dynamic behaviors of self-organizing polymeric systems. - 270 p.

Source: Dissertation Abstracts International, Volume: 65-07, Section: B, page: 3442.

Thesis (Ph.D.)--Case Western Reserve University, 2005.

Two topics of self-organizing polymeric systems are explored in this work: thermodynamic and dynamic properties of liquid crystal polymers in solutions and rheological behaviors of self-organizing gels.

ISBN: 0496882811Subjects--Topical Terms:

586156
Chemistry, Analytical.

Thermodynamic and dynamic behaviors of self-organizing polymeric systems.
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245 1 0 $a Thermodynamic and dynamic behaviors of self-organizing polymeric systems.
300 $a 270 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-07, Section: B, page: 3442.
500 $a Adviser: Alexander M. Jamieson.
502 $a Thesis (Ph.D.)--Case Western Reserve University, 2005.
520 $a Two topics of self-organizing polymeric systems are explored in this work: thermodynamic and dynamic properties of liquid crystal polymers in solutions and rheological behaviors of self-organizing gels.
520 $a For dilute nematic solutions of end-on side-chain liquid crystal polysiloxanes (SCLCP) dissolved in 5CB, the chain anisotropies R&par;/R &perp;, obtained from electrorheological(ER) analysis based on the Brochard model, are consistent with independent measurements of Rg&par;/R g&perp; via small-angle neutron scattering (SANS), which unambiguously demonstrating a slightly prolate SCLCP chain conformation. Dissolution of this prolate SCLCP in flow-aligning 5CB produces a tumbling flow, clearly indicating a discrepancy with the Brochard hydrodynamic theory which predicts such a transition only for oblate conformation. A numerical comparison using a modified version of the Brochard model leads to improved self-consistent agreement between SANS, ER and shear transient experiments. The molecular weight dependence of the chain conformational relaxation time it indicates an extended SCLCP chain conformation in 5CB. SANS analysis suggests that the SCLCP conformation is sensitive to the solvent interaction, i.e. a more extended conformation is observed in isotropic acetone-d6 than in nematic 5CB.
520 $a A SANS conformational study of SCLCCs with methoxyphenylbenzoate mesogenic side group in CDC13 demonstrates that the form factor of a single comb-like SCLCP chain is well described by a wormlike chain model with finite cross-sectional thickness over the entire q range, taking into account the molecular weight polydispersity. Consistent with measurement of a large R g from low q analysis, the resulting persistence length lp is in the range 28&sim;32 A, substantially larger than that of unsubstituted polydimethylsiloxane (PDMS) chain (l p =5.8 A), which suggests a relatively rigid SCLCP chain due to the influence of densely attached mesogenic groups.
520 $a For nematic mixtures of copolysiloxane SCLCP in 5OCB, a metastably extended miscible nematic range is observed at low SCLCP concentration upon cooling. Onset of an induced smectic phase occurs upon cooling at 60%wt SCLCP concentration which corresponds to 48:52 molar ratio of mesogens. Dielectric spectra of these mixtures over a wide concentration range exhibit two distinct regimes of relaxation behavior reflecting the crossover from dilute and semidilute to concentrated regime.
520 $a Rheological behavior of a metallo-supramolecular gel with thixotropic feature is explored to understand the viscoelastic behaviors of self-assembling networks consisting of "living polymers". A well-defined yield point and non-linear viscoelasticity at small strain are probed via the controlled-stress and controlled-strain measurements, respectively. The self-assembled network is readily presheared into a Newtonian sol and displays a three-stage kinetic recovery process, closely associated with the metal ion-ligand binding kinetics and related phase behaviors.
520 $a Finally, we investigate the viscoelastic properties of a novel colloidal gel in which macrocycles self-assemble into interconnected self-organized clusters. A series of rheological experiments are combined to reveal the shear responsive nature as well as linear and nonlinear viscoelasticity of this gel. Certain features of observed viscoelastic properties demonstrate the characteristics of the behavior of colloidal gels which show slow glassy dynamics. The negative temperature dependence of the storage modulus at low frequency suggests that enthalpic contributions to elasticity need to be considered, presumably due to internal energy changes upon deformation.
590 $a School code: 0042.
650 4 $a Chemistry, Analytical. $3 586156
650 4 $a Chemistry, Organic. $3 516206
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Physics, Condensed Matter. $3 1018743
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690 $a 0490
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710 2 0 $a Case Western Reserve University. $3 1017714
773 0 $t Dissertation Abstracts International $g 65-07B.
790 1 0 $a Jamieson, Alexander M., $e advisor
790 $a 0042
791 $a Ph.D.
792 $a 2005
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