東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Linked to FindBook

Google Book

Amazon

博客來

The Effect of Morpholine and Polymer Network Structure on Electro-Optical Properties of Polymer Stabilized Cholesteric Liquid Crystals.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The Effect of Morpholine and Polymer Network Structure on Electro-Optical Properties of Polymer Stabilized Cholesteric Liquid Crystals./
Author:	Lippert, Daniel Andreas.
Description:	1 online resource (56 pages)
Notes:	Source: Masters Abstracts International, Volume: 81-04.
Contained By:	Masters Abstracts International81-04.
Subject:	Chemical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13862562click for full text (PQDT)
ISBN:	9781085780865

The Effect of Morpholine and Polymer Network Structure on Electro-Optical Properties of Polymer Stabilized Cholesteric Liquid Crystals.
Lippert, Daniel Andreas.

The Effect of Morpholine and Polymer Network Structure on Electro-Optical Properties of Polymer Stabilized Cholesteric Liquid Crystals. - 1 online resource (56 pages)

Source: Masters Abstracts International, Volume: 81-04.

Thesis (M.S.)--The University of Iowa, 2019.

Includes bibliographical references

Polymer stabilized cholesteric liquid crystals (PSCLCs) provide many advantages over other electro-optical materials. The unique helical structure of the cholesteric liquid crystal (CLC) creates a natural gradient for light interacting across each CLC domain layer. Not only does the CLC helical structure greatly increase the bandwidth tuning and broadening range, it also allows CLCs to act as a polarizer, notch filter, reflector, and optical rotator all in one material. However, while many novel PSCLC materials have been created, little is understood about how complex initial system interactions affect final electro-optical (e-o) properties.1,2 In this work, the principal variables affecting PSCLC blue shift electro-optical behavior have been determined through structural analysis and measurement of electro-optical properties. Typical PSCLC materials must meet both formulation and photopolymerization processing requirements to display blue shift e-o properties. Threshold photoinitiator concentrations (0.5-1.5 wt%) and morpholine containing group concentrations (0.25-1.0 wt%) were both shown to be primary factors, along with sufficient UV exposure time (10-30 min) and light intensity (500 mW/cm2, 365 nm), for PSCLC blue shift bandwidth tuning/broadening to occur. Morpholine was initially identified as a component of photoinitators Irgacure 369 and 907 and was proven to increase PSCLC ion density altering LC-polymer network interactions with several proposed theories included later in this work. The use of an appropriate morpholine containing LC monomer to directly incorporate morpholine into the LC-polymer network was shown to greatly improve PSCLC sample stability. Through the results of this research we successfully induced blue shift e-o behavior in a previous red shift only PSCLC using only 30% of the UV exposure that a model PSCLC blue shift sample required while extending the blue shift broadening range over threefold (from 75 nm to 250 nm). The fundamental understanding and design of PSCLC systems described herein serves as a starting point for engineering PSCLC materials with specific and desirable electro-optical properties.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9781085780865Subjects--Topical Terms:

560457
Chemical engineering.
Subjects--Index Terms:

Cholesteric liquid crystalsIndex Terms--Genre/Form:

542853
Electronic books.

The Effect of Morpholine and Polymer Network Structure on Electro-Optical Properties of Polymer Stabilized Cholesteric Liquid Crystals.
LDR:03562nmm a2200385K 4500 001 2356683
005 20230619080047.5
006 m o d
007 cr mn ---uuuuu
008 241011s2019 xx obm 000 0 eng d
020 $a 9781085780865
035 $a (MiAaPQ)AAI13862562
035 $a AAI13862562
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Lippert, Daniel Andreas. $3 3697181
245 1 4 $a The Effect of Morpholine and Polymer Network Structure on Electro-Optical Properties of Polymer Stabilized Cholesteric Liquid Crystals.
264 0 $c 2019
300 $a 1 online resource (56 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Masters Abstracts International, Volume: 81-04.
500 $a Advisor: Guymon, C. Allan.
502 $a Thesis (M.S.)--The University of Iowa, 2019.
504 $a Includes bibliographical references
520 $a Polymer stabilized cholesteric liquid crystals (PSCLCs) provide many advantages over other electro-optical materials. The unique helical structure of the cholesteric liquid crystal (CLC) creates a natural gradient for light interacting across each CLC domain layer. Not only does the CLC helical structure greatly increase the bandwidth tuning and broadening range, it also allows CLCs to act as a polarizer, notch filter, reflector, and optical rotator all in one material. However, while many novel PSCLC materials have been created, little is understood about how complex initial system interactions affect final electro-optical (e-o) properties.1,2 In this work, the principal variables affecting PSCLC blue shift electro-optical behavior have been determined through structural analysis and measurement of electro-optical properties. Typical PSCLC materials must meet both formulation and photopolymerization processing requirements to display blue shift e-o properties. Threshold photoinitiator concentrations (0.5-1.5 wt%) and morpholine containing group concentrations (0.25-1.0 wt%) were both shown to be primary factors, along with sufficient UV exposure time (10-30 min) and light intensity (500 mW/cm2, 365 nm), for PSCLC blue shift bandwidth tuning/broadening to occur. Morpholine was initially identified as a component of photoinitators Irgacure 369 and 907 and was proven to increase PSCLC ion density altering LC-polymer network interactions with several proposed theories included later in this work. The use of an appropriate morpholine containing LC monomer to directly incorporate morpholine into the LC-polymer network was shown to greatly improve PSCLC sample stability. Through the results of this research we successfully induced blue shift e-o behavior in a previous red shift only PSCLC using only 30% of the UV exposure that a model PSCLC blue shift sample required while extending the blue shift broadening range over threefold (from 75 nm to 250 nm). The fundamental understanding and design of PSCLC systems described herein serves as a starting point for engineering PSCLC materials with specific and desirable electro-optical properties.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Chemical engineering. $3 560457
650 4 $a Applied physics. $3 3343996
650 4 $a Optics. $3 517925
653 $a Cholesteric liquid crystals
653 $a Electro-optical properties
653 $a Morpholine
653 $a Polymer stabilized
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0542
690 $a 0752
690 $a 0215
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a The University of Iowa. $b Chemical & Biochemical Engineering. $3 1675128
773 0 $t Masters Abstracts International $g 81-04.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13862562 $z click for full text (PQDT)