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The impact of non-equilibrium micros...

Thomin, James D.

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The impact of non-equilibrium microstructure on the mechanical response of polymer nanocomposites.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	The impact of non-equilibrium microstructure on the mechanical response of polymer nanocomposites./
Author:	Thomin, James D.
Description:	119 p.
Notes:	Advisers: Sanat Kumar; Pawel Keblinski.
Contained By:	Dissertation Abstracts International68-10B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3286345
ISBN:	9780549287797

The impact of non-equilibrium microstructure on the mechanical response of polymer nanocomposites.
Thomin, James D.

The impact of non-equilibrium microstructure on the mechanical response of polymer nanocomposites. - 119 p.

Advisers: Sanat Kumar; Pawel Keblinski.

Thesis (Ph.D.)--Rensselaer Polytechnic Institute, 2007.

First, attractive particle-polymer interactions lead to a slowing of polymer motion in the interfacial zone. This effect then leads to an overall increase in the stress relaxation curve, in proportion to the volume fraction of the interfacial zone.

ISBN: 9780549287797Subjects--Topical Terms:

1018428
Chemistry, Polymer.

The impact of non-equilibrium microstructure on the mechanical response of polymer nanocomposites.
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020 $a 9780549287797
035 $a (UMI)AAI3286345
035 $a AAI3286345
040 $a UMI $c UMI
100 1 $a Thomin, James D. $3 1285515
245 1 4 $a The impact of non-equilibrium microstructure on the mechanical response of polymer nanocomposites.
300 $a 119 p.
500 $a Advisers: Sanat Kumar; Pawel Keblinski.
500 $a Source: Dissertation Abstracts International, Volume: 68-10, Section: B, page: 6730.
502 $a Thesis (Ph.D.)--Rensselaer Polytechnic Institute, 2007.
520 $a First, attractive particle-polymer interactions lead to a slowing of polymer motion in the interfacial zone. This effect then leads to an overall increase in the stress relaxation curve, in proportion to the volume fraction of the interfacial zone.
520 $a Experiments have shown that polymer nanocomposites can have mechanical properties that are greatly reinforced compared to the pure polymer, or even to equivalent micro-composites. However, despite a wealth of experimental observations, exactly how this occurs is still under debate. Using Molecular Dynamics computer simulations, we have shown that three primary physical effects can be present, depending on the system specifics.
520 $a Second, at high volume fractions of particles, "jamming" can occur whereby the particles make direct contact. This leads to solid-like behavior that is not polymer-based. Jamming can also occur at low volume fractions when the polymer-particle attractions are strong enough that polymer molecules form a bound layer around the particles, increasing the effective diameter to above the percolation threshold.
520 $a The third effect is polymer-based, and can result in the formation of a long-time plateau in the relaxation modulus, or a substantial increase in the entanglement plateau. It occurs when polymer-particle interactions are strong enough that polymers are immobilized on the particle surface, but at volume fractions where there is a separation between bulk and interfacial regions. When these conditions are met, interparticle bridges may form, which then lead to network reinforcement. These conditions are by nature non-equilibrium, meaning that there are glassy regions which do not relax within accessible time-scales. Therefore, the properties of the composite depend strongly on processing history.
520 $a At the opposite extreme, when polymer-particle interactions are weak, non-equilibrium particle clustering occurs. In contrast to the melt structures which are glassy because of strong enthalpic interactions, particle clustering is driven primarily by the polymer entropy. As a consequence, applying strain at rates corresponding to the shear-thinning regime tends to increase particle dispersion.
520 $a The different modes of reinforcement which occur at different interaction strengths, combined with the inherently non-equilibrium nature of the microstructure at the extreme low or high end of the interaction strength scale explain why disagreement over the nature of reinforcement has persisted in the experimental community. These simulation results provide a qualitative "map" of the types of reinforcement and non-equilibrium behavior that one would expect to see for different ranges of the particle-polymer interaction energy.
590 $a School code: 0185.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Physics, Molecular. $3 1018648
690 $a 0495
690 $a 0609
710 2 $a Rensselaer Polytechnic Institute. $3 1019062
773 0 $t Dissertation Abstracts International $g 68-10B.
790 $a 0185
790 1 0 $a Keblinski, Pawel, $e advisor
790 1 0 $a Kumar, Sanat, $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3286345