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Polymer hydrogel nanoparticles and t...

Lu, Xihua.

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Polymer hydrogel nanoparticles and their networks.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Polymer hydrogel nanoparticles and their networks./
Author:	Lu, Xihua.
Description:	105 p.
Notes:	Source: Dissertation Abstracts International, Volume: 63-09, Section: B, page: 4321.
Contained By:	Dissertation Abstracts International63-09B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3065702
ISBN:	0493848541

Polymer hydrogel nanoparticles and their networks.
Lu, Xihua.

Polymer hydrogel nanoparticles and their networks. - 105 p.

Source: Dissertation Abstracts International, Volume: 63-09, Section: B, page: 4321.

Thesis (Ph.D.)--University of North Texas, 2002.

The thermally responsive hydroxypropyl cellulose (HPC) hydrogel nanoparticles have been synthesized and characterized. The HPC particles were obtained by chemically crosslinking collapsed HPC polymer chains in water-surfactant (dodecyltrimethylammonium bromide) dispersion above the lower critical solution temperature (LCST) of the HPC. The size distributions of the nanoparticles, measured by dynamic light scattering, have been correlated with synthesis conditions including surfactant concentration, polymer concentration, and reaction temperature. The swelling and phase transition properties of the resultant HPC nanoparticles have been analyzed using both static and dynamic light scattering techniques.

ISBN: 0493848541Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Polymer hydrogel nanoparticles and their networks.
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035 $a (UnM)AAI3065702
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100 1 $a Lu, Xihua. $3 1926611
245 1 0 $a Polymer hydrogel nanoparticles and their networks.
300 $a 105 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-09, Section: B, page: 4321.
500 $a Major Professor: Zhibing Hu.
502 $a Thesis (Ph.D.)--University of North Texas, 2002.
520 $a The thermally responsive hydroxypropyl cellulose (HPC) hydrogel nanoparticles have been synthesized and characterized. The HPC particles were obtained by chemically crosslinking collapsed HPC polymer chains in water-surfactant (dodecyltrimethylammonium bromide) dispersion above the lower critical solution temperature (LCST) of the HPC. The size distributions of the nanoparticles, measured by dynamic light scattering, have been correlated with synthesis conditions including surfactant concentration, polymer concentration, and reaction temperature. The swelling and phase transition properties of the resultant HPC nanoparticles have been analyzed using both static and dynamic light scattering techniques.
520 $a By first making gel nanoparticles and then covalently bonding them together, we have engineered a new class of gels with two levels of structural hierarchy: the primary network is crosslinked polymer chains in each individual particle, while the secondary network is a system of crosslinked nanoparticles. The covalent bonding contributes to the structural stability of the nanostructured gels, while self-assembly provides them with crystal structures that diffract light, resulting in colors. By using N-isopropylacrylamide copolymer hydrogel nanoparticles, we have synthesized nanoparticle networks that display a striking iridescence like precious opal but are soft and flexible like gelatin. This is in contrast to previous colored hydrogels, which were created either by adding dyes or fluorescent, or by organic solvent or by embedding a colloidal crystal array of polymer solid spheres. Creating such periodic 3D structures in materials allows us to obtain useful functionality not only from the constituent building blocks but also from the long-range ordering that characterizes these structures.
520 $a Hydroxypropyl cellulose (HPC) and poly (acrylic acid) (PAA) complexes were studied using turbidity measurement and laser light scattering. The phase transition temperature of the complexes is found to depend on pH and molecular weights of PAA and HPC. The driving force for this phenomenon is due to the hydrogen bonding and hydrophobic interaction of the macromolecules. Based on the principle of the PAA/HPC complexes, the PAA nanoparticles were synthesized in 0.1wt % HPC aqueous solution at room temperature.
590 $a School code: 0158.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0794
690 $a 0495
710 2 0 $a University of North Texas. $3 1017396
773 0 $t Dissertation Abstracts International $g 63-09B.
790 1 0 $a Hu, Zhibing, $e advisor
790 $a 0158
791 $a Ph.D.
792 $a 2002
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3065702