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Synthesis and characterization of no...

Lee, Jae Sik.

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Synthesis and characterization of novel, highly branched polystyrenes and their interfacial segregation and bulk thermodynamics in blends with linear polystyrenes.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Synthesis and characterization of novel, highly branched polystyrenes and their interfacial segregation and bulk thermodynamics in blends with linear polystyrenes./
Author:	Lee, Jae Sik.
Description:	264 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2609.
Contained By:	Dissertation Abstracts International66-05B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3175334
ISBN:	0542137305

Synthesis and characterization of novel, highly branched polystyrenes and their interfacial segregation and bulk thermodynamics in blends with linear polystyrenes.
Lee, Jae Sik.

Synthesis and characterization of novel, highly branched polystyrenes and their interfacial segregation and bulk thermodynamics in blends with linear polystyrenes. - 264 p.

Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2609.

Thesis (Ph.D.)--The University of Akron, 2005.

The effects of the number of branch points and the number of chain ends in a branched polymer on the bulk thermodynamics and interfacial segregation in binary polymer blends were studied for the first time using blends of novel, well-defined, branched polystyrenes with linear analogues. The study necessitated the synthesis of a novel series of branched polystyrenes. In the first group of molecules, the number of branch points was varied from 1 to 2 to 4 while the number of ends was fixed at 6. The effect of the number of chain ends was studied using three molecules each having 4 branch points, but the number of chain ends varied from 6 to 9 to 13. The precursor for the 6-end pom-pom polymer with two branch points was synthesized with a difunctional initiator. The precursors for the three end-branched star polystyrenes with 6, 9, and 13 end branches were synthesized with a trifunctional initiator and then were functionalized with different silane linking agents. Finally, the arm polymers were linked at the chlorosilyl chain ends of each precursor for the 6- and 9-end branched polymers. For the 13-end branched polymer with 4 branch points, the chain ends of the precursor were transformed from chrolosilyl to methoxysilyl groups in order to attach the higher number of end branches. The new method of methoxysilyl functionaliztion was demonstrated and characterized by making a model 4-arm star polystyrene. The molecular characteristics of the branched chains were investigated with size exclusion chromatography, intrinsic viscosity measurement, dynamic light scattering, and the collective dynamic behavior of the pure branched materials probed with differential scanning calorimetry. When the typology and overall molecular weight of the chain were held constant and the number of chain ends increased, the chain size as measured by both g', the branching factor, and R h, the hydrodynamic radius in good solvent, decreased. However, chain size did not decrease monotonically with the number of branches in the chain, apparently due to the importance of typology in dictating size. (Abstract shortened by UMI.)

ISBN: 0542137305Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Synthesis and characterization of novel, highly branched polystyrenes and their interfacial segregation and bulk thermodynamics in blends with linear polystyrenes.
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100 1 $a Lee, Jae Sik. $3 1904840
245 1 0 $a Synthesis and characterization of novel, highly branched polystyrenes and their interfacial segregation and bulk thermodynamics in blends with linear polystyrenes.
300 $a 264 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2609.
500 $a Adviser: Mark D. Foster.
502 $a Thesis (Ph.D.)--The University of Akron, 2005.
520 $a The effects of the number of branch points and the number of chain ends in a branched polymer on the bulk thermodynamics and interfacial segregation in binary polymer blends were studied for the first time using blends of novel, well-defined, branched polystyrenes with linear analogues. The study necessitated the synthesis of a novel series of branched polystyrenes. In the first group of molecules, the number of branch points was varied from 1 to 2 to 4 while the number of ends was fixed at 6. The effect of the number of chain ends was studied using three molecules each having 4 branch points, but the number of chain ends varied from 6 to 9 to 13. The precursor for the 6-end pom-pom polymer with two branch points was synthesized with a difunctional initiator. The precursors for the three end-branched star polystyrenes with 6, 9, and 13 end branches were synthesized with a trifunctional initiator and then were functionalized with different silane linking agents. Finally, the arm polymers were linked at the chlorosilyl chain ends of each precursor for the 6- and 9-end branched polymers. For the 13-end branched polymer with 4 branch points, the chain ends of the precursor were transformed from chrolosilyl to methoxysilyl groups in order to attach the higher number of end branches. The new method of methoxysilyl functionaliztion was demonstrated and characterized by making a model 4-arm star polystyrene. The molecular characteristics of the branched chains were investigated with size exclusion chromatography, intrinsic viscosity measurement, dynamic light scattering, and the collective dynamic behavior of the pure branched materials probed with differential scanning calorimetry. When the typology and overall molecular weight of the chain were held constant and the number of chain ends increased, the chain size as measured by both g', the branching factor, and R h, the hydrodynamic radius in good solvent, decreased. However, chain size did not decrease monotonically with the number of branches in the chain, apparently due to the importance of typology in dictating size. (Abstract shortened by UMI.)
590 $a School code: 0003.
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710 2 0 $a The University of Akron. $3 1018399
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790 1 0 $a Foster, Mark D., $e advisor
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