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Probing mechanical activation of cov...

Wang, Yifei.

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Probing mechanical activation of covalent chemistry in crosslinked polymer gels.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Probing mechanical activation of covalent chemistry in crosslinked polymer gels./
Author:	Wang, Yifei.
Description:	90 p.
Notes:	Source: Masters Abstracts International, Volume: 51-06.
Contained By:	Masters Abstracts International51-06(E).
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1536687
ISBN:	9781303056598

Probing mechanical activation of covalent chemistry in crosslinked polymer gels.
Wang, Yifei.

Probing mechanical activation of covalent chemistry in crosslinked polymer gels. - 90 p.

Source: Masters Abstracts International, Volume: 51-06.

Thesis (M.S.)--Duke University, 2013.

Toughness, the measure of how much energy a material can absorb before rupture, is an important property of materials. It has been demonstrated that the toughness of a single polymer chain of gem-dihalocyclopropane (gDHC) functionalized polybutadiene (PB) is increased dramatically over PB alone, due to the mechanically triggered electrocyclic ring opening reaction of gDHC into 2,3-dibromoalkenes. This thesis explores whether this molecular mechanical property can also be manifested in bulk material properties. Crosslinked gem-dichlorocyclopropane (gDCC) embedded PB polymers were swollen in various solvents, and the resulting gels were mechanically deformed under tensile stress. Young's modulus and fracture toughness were compared among PBs with gDCC incorporated in the backbones and/or crosslinking positions. The results showed that the incorporation of gDCC does not measurably increase the fracture toughness of the crosslinked polymer gels. Neither NMR nor FT-IR characterization of the post-test samples revealed detectable activation of the gDCC in the crosslinked PB. Further experiments will be focused on optimizing the polymer structure and testing methods to more effectively transfer the macroscopic force to the mechanophore in the material and continuing exploring the correlation between molecular responses and changes in macroscopic properties.

ISBN: 9781303056598Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Probing mechanical activation of covalent chemistry in crosslinked polymer gels.
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020 $a 9781303056598
035 $a (MiAaPQ)AAI1536687
035 $a AAI1536687
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100 1 $a Wang, Yifei. $3 2101541
245 1 0 $a Probing mechanical activation of covalent chemistry in crosslinked polymer gels.
300 $a 90 p.
500 $a Source: Masters Abstracts International, Volume: 51-06.
500 $a Adviser: Stephen L. Craig.
502 $a Thesis (M.S.)--Duke University, 2013.
520 $a Toughness, the measure of how much energy a material can absorb before rupture, is an important property of materials. It has been demonstrated that the toughness of a single polymer chain of gem-dihalocyclopropane (gDHC) functionalized polybutadiene (PB) is increased dramatically over PB alone, due to the mechanically triggered electrocyclic ring opening reaction of gDHC into 2,3-dibromoalkenes. This thesis explores whether this molecular mechanical property can also be manifested in bulk material properties. Crosslinked gem-dichlorocyclopropane (gDCC) embedded PB polymers were swollen in various solvents, and the resulting gels were mechanically deformed under tensile stress. Young's modulus and fracture toughness were compared among PBs with gDCC incorporated in the backbones and/or crosslinking positions. The results showed that the incorporation of gDCC does not measurably increase the fracture toughness of the crosslinked polymer gels. Neither NMR nor FT-IR characterization of the post-test samples revealed detectable activation of the gDCC in the crosslinked PB. Further experiments will be focused on optimizing the polymer structure and testing methods to more effectively transfer the macroscopic force to the mechanophore in the material and continuing exploring the correlation between molecular responses and changes in macroscopic properties.
590 $a School code: 0066.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Chemistry, Organic. $3 516206
690 $a 0495
690 $a 0490
710 2 $a Duke University. $b Chemistry. $3 1064507
773 0 $t Masters Abstracts International $g 51-06(E).
790 $a 0066
791 $a M.S.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1536687