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Synthesis, characterization and prop...

Chu, Chin.

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Synthesis, characterization and properties of model PCHE/PE block copolymers.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Synthesis, characterization and properties of model PCHE/PE block copolymers./
Author:	Chu, Chin.
Description:	256 p.
Notes:	Adviser: Frank S. Bates.
Contained By:	Dissertation Abstracts International69-01B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3299408
ISBN:	9780549436522

Synthesis, characterization and properties of model PCHE/PE block copolymers.
Chu, Chin.

Synthesis, characterization and properties of model PCHE/PE block copolymers. - 256 p.

Adviser: Frank S. Bates.

Thesis (Ph.D.)--University of Minnesota, 2008.

Hydrogenated polystyrene (also known as polycyclohexylethylene, PCHE) has many material properties superior to those of polystyrene such as improved thermal, oxidative and UV stability; much increased glass transition temperature and a twenty-four fold reduction in the stress optical coefficient. Coupled with the desirable light absorption spectrum, PCHE is a good candidate for replacing polycarbonate in many optical applications. However, PCHE hornopolymer is a brittle glass due to high entanglement molecular weight, which severely limits the effectiveness of the polymer. The overall toughness of PCHE has to be significantly enhanced before any practical usages.

ISBN: 9780549436522Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Synthesis, characterization and properties of model PCHE/PE block copolymers.
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020 $a 9780549436522
035 $a (UMI)AAI3299408
035 $a AAI3299408
040 $a UMI $c UMI
100 1 $a Chu, Chin. $3 1280786
245 1 0 $a Synthesis, characterization and properties of model PCHE/PE block copolymers.
300 $a 256 p.
500 $a Adviser: Frank S. Bates.
500 $a Source: Dissertation Abstracts International, Volume: 69-01, Section: B, page: 0346.
502 $a Thesis (Ph.D.)--University of Minnesota, 2008.
520 $a Hydrogenated polystyrene (also known as polycyclohexylethylene, PCHE) has many material properties superior to those of polystyrene such as improved thermal, oxidative and UV stability; much increased glass transition temperature and a twenty-four fold reduction in the stress optical coefficient. Coupled with the desirable light absorption spectrum, PCHE is a good candidate for replacing polycarbonate in many optical applications. However, PCHE hornopolymer is a brittle glass due to high entanglement molecular weight, which severely limits the effectiveness of the polymer. The overall toughness of PCHE has to be significantly enhanced before any practical usages.
520 $a Incorporating a ductile component into the PCHE in the form of linear block copolymer was chosen as the toughening strategy. Polyethylene (PE) from the hydrogenation of poly(1,4-butadiene) was selected as the soft block due to its excellent low temperature ductility and a refractive index nearly identical to that of PCHE. Model PCHE/PE block copolymers were synthesized via anionic polymerization followed by catalytic hydrogenation. Either sequential monomer addition or use of a bifunctional coupling agent was utilized in the synthesis of precursor block copolymers. Model PCHE/PE block copolymers with variety of linear chain architectures, ranging from diblock to pentablock, were synthesized and fully characterized.
520 $a The melting temperature and percent crystallinity of PE blocks were measured for the model PCHE/PE block copolymers under variety of material states: (1) multigrains versus single grain of block copolymer microstructures; (2) as-pressed versus strained-to-break. The orientation of PE stems with respect to the interfaces of block copolymer microstructure was probed using a model block copolymer with globally aligned lamellar microstructure. Changes in PE crystallites after tensile deformation were characterized.
520 $a The tensile mechanical properties were investigated for model PCHE/PE block copolymers with multigrains of microstructures. Anisotropic tensile mechanical properties were characterized for model block copolymers with a single grain of globally aligned lamellar microstructure. Morphological changes of block copolymer microstructures associated with the tensile deformation were probed. Key finding was the surprising improvements in tensile mechanical properties of the pentablock over analogous triblock copolymers, demonstrating the effect of block copolymer chain architecture.
590 $a School code: 0130.
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0495
710 2 $a University of Minnesota. $3 676231
773 0 $t Dissertation Abstracts International $g 69-01B.
790 $a 0130
790 1 0 $a Bates, Frank S., $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3299408