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Microstructure of physically crossli...

Clark, John Charles.

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Microstructure of physically crosslinked polymer gels.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Microstructure of physically crosslinked polymer gels./
Author:	Clark, John Charles.
Description:	305 p.
Notes:	Source: Dissertation Abstracts International, Volume: 49-05, Section: B, page: 1741.
Contained By:	Dissertation Abstracts International49-05B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8805700

Microstructure of physically crosslinked polymer gels.
Clark, John Charles.

Microstructure of physically crosslinked polymer gels. - 305 p.

Source: Dissertation Abstracts International, Volume: 49-05, Section: B, page: 1741.

Thesis (Ph.D.)--University of Minnesota, 1987.

Three polymer-solvent gel systems--atactic polystyrene/carbon disulfide, poly(2,6-dimethyl 1,4-phenylene oxide)/orthochlorostyrene, and poly(N-vinylpyrrolidone)-phenoxy resin/water were investigated using small angle neutron, xray, and light scattering, wide angle xray diffraction, capillary viscometry, nuclear magnetic resonance, and dynamic mechanical testing techniques. Aspects of the microstructure of these gels were revealed.Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Microstructure of physically crosslinked polymer gels.
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008 130614s1987 eng d
035 $a (UnM)AAI8805700
035 $a AAI8805700
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100 1 $a Clark, John Charles. $3 1927639
245 1 0 $a Microstructure of physically crosslinked polymer gels.
300 $a 305 p.
500 $a Source: Dissertation Abstracts International, Volume: 49-05, Section: B, page: 1741.
502 $a Thesis (Ph.D.)--University of Minnesota, 1987.
520 $a Three polymer-solvent gel systems--atactic polystyrene/carbon disulfide, poly(2,6-dimethyl 1,4-phenylene oxide)/orthochlorostyrene, and poly(N-vinylpyrrolidone)-phenoxy resin/water were investigated using small angle neutron, xray, and light scattering, wide angle xray diffraction, capillary viscometry, nuclear magnetic resonance, and dynamic mechanical testing techniques. Aspects of the microstructure of these gels were revealed.
520 $a In the Polystyrene/CS $\ sb2 $ system gelation temperatures were defined using the storage modulus from dynamic mechanical measurements in the frequency range from.1 to 100 Hz. Gel temperatures increased with the concentration of the solution and agreed well with gel melting temperatures in the literature using the "ball drop" method. NMR results indicate that a bimodal distribution of relaxation times exist in the gel. Small angle neutron scattering experiments identify particles of 50 to 100 A in size with sharp boundaries. It is postulated that syndiotactic and isotactic sequences are responsible for the formation of small crystallites in the solution which act as physical crosslinks.
520 $a The PPO/OCLS system was studied with xray diffraction on a slowly cooled 30% polymer sample at $- $1 0 $\ sp\circ $\ sim $1 00 A thickness and a $\ sim $5 00 A diameter. A highly ordered phase structure was apparent from the periodic maxima of the scattering function. Optical microscopy confirmed the phase separation presence and size. These results indicate gelation is a result of lamellar crystallites acting as physical crosslinkages. Liquid-liquid phase separation was not a requirement for gelation.
520 $a Poly(N-vinylpyrrolidone)/Phenoxy resin/water gels prepared at room temperature were investigated. Small angle x-ray scattering indicates that an irreversible structure change occurs at 75 $\ sp\circ
590 $a School code: 0130.
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0495
710 2 0 $a University of Minnesota. $3 676231
773 0 $t Dissertation Abstracts International $g 49-05B.
790 $a 0130
791 $a Ph.D.
792 $a 1987
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8805700