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Polymer-layered silicate nanocomposi...

Chen, Hua.

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Polymer-layered silicate nanocomposites: Rheology and intercalation kinetics.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Polymer-layered silicate nanocomposites: Rheology and intercalation kinetics./
Author:	Chen, Hua.
Description:	171 p.
Notes:	Source: Dissertation Abstracts International, Volume: 61-11, Section: B, page: 6076.
Contained By:	Dissertation Abstracts International61-11B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9995118
ISBN:	049302185X

Polymer-layered silicate nanocomposites: Rheology and intercalation kinetics.
Chen, Hua.

Polymer-layered silicate nanocomposites: Rheology and intercalation kinetics. - 171 p.

Source: Dissertation Abstracts International, Volume: 61-11, Section: B, page: 6076.

Thesis (Ph.D.)--Cornell University, 2001.

Layered silicate based polymer nanocomposites have provided a convenient macroscopic system to study fundamental scientific issues concerning confined and tethered polymers.

ISBN: 049302185XSubjects--Topical Terms:

1017759
Engineering, Materials Science.

Polymer-layered silicate nanocomposites: Rheology and intercalation kinetics.
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020 $a 049302185X
035 $a (UnM)AAI9995118
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100 1 $a Chen, Hua. $3 1286132
245 1 0 $a Polymer-layered silicate nanocomposites: Rheology and intercalation kinetics.
300 $a 171 p.
500 $a Source: Dissertation Abstracts International, Volume: 61-11, Section: B, page: 6076.
500 $a Adviser: Emmanuel Giannelis.
502 $a Thesis (Ph.D.)--Cornell University, 2001.
520 $a Layered silicate based polymer nanocomposites have provided a convenient macroscopic system to study fundamental scientific issues concerning confined and tethered polymers.
520 $a In this thesis, the kinetics of intercalation of monodispersed polystyrene in organosilicates were studied using x-ray diffraction. The kinetics of the neat polymers and their functionalized derivatives and copolymers were measured as a function of molecular weight, extent of functionalization or block ratio and silicate surface organic modification, at various temperatures. The kinetics data are interpreted in terms of an effective diffusion coefficient (D eff) of the polymer, which undergoes a dramatic decrease with stronger silicate surface-polymer affinity. The intercalation kinetics exhibits a similar temperature dependence as the self-diffusion in polymer bulk, but a very different molecular weight dependence. At low molecular weight, i.e. below Mc, Deff ∞ N<super>−0.3</super>, and at higher molecular weight, Deff ∞ N<super>−1</super>. Competition and substitution experiments have shown that at low temperature, the faster, kinetically controlled intercalation (with longer surfactant modified silicate) dominates; but at higher temperature, the more stable, thermodynamically controlled intercalation (with shorter surfactant modified silicate) prevails. In addition, the intercalation kinetics under shear flow were also investigated. High frequency (inside the plateau zone in the master curves of both the neat polymer and the intercalated nanocomposites) shear can align the silicate layers to some extent, but has a more significant effect on the polymer chains. The copolymer of poly(styrene-b-isoprene) can also intercalates into organosilicates by annealing. Such intercalation can occur at temperature above as well as below its TODT. The temperature dependence of the effective diffusion coefficients of copolymer intercalation does not display any discontinuity when TODT is traversed, same as the temperature behavior of its self-diffusion.
520 $a In addition, end-tethered dispersed polystyrene nanocomposites were synthesized by TEMPO-mediated free living radical polymerization and their rheological behavior studied. They exhibit unique behavior in both the terminal zone and the plateau zone. Non-terminal behavior was observed with as low as 1.7% silicate loading and a two fold increase in entanglement molecular weight was obtained with less than 5% silicate loading.
590 $a School code: 0058.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0794
690 $a 0548
690 $a 0495
710 2 0 $a Cornell University. $3 530586
773 0 $t Dissertation Abstracts International $g 61-11B.
790 1 0 $a Giannelis, Emmanuel, $e advisor
790 $a 0058
791 $a Ph.D.
792 $a 2001
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9995118