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Polymer Physics of Nanocomposites.

The University of Wisconsin - Madison.

Polymer Physics of Nanocomposites.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Polymer Physics of Nanocomposites.
作者:	Toepperwein, Gregory N.
面頁冊數:	163 p.
附註:	Source: Dissertation Abstracts International, Volume: 73-09(E), Section: B.
附註:	Adviser: Juan de Pablo.
Contained By:	Dissertation Abstracts International73-09B(E).
標題:	Engineering, Chemical.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3508107
ISBN:	9781267336644

Polymer Physics of Nanocomposites.
Toepperwein, Gregory N.

Polymer Physics of Nanocomposites. - 163 p.

Source: Dissertation Abstracts International, Volume: 73-09(E), Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2012.

Addition of nanoparticles to polymer melts can significantly alter the mechanical properties and structure of the resulting composite systems. In order to address the influence of particle shape on nanocomposite behavior, extensive Monte Carlo and molecular dynamics simulations are used to examine the structure and deformation behavior of a model polymer upon addition of rods with varying aspect ratios. Such systems were examined at equilibrium, as well as at numerous non-equilbrium states induced by cooling and deformation. Past theoretical and computational studies of polymer nanocomposites have largely focused on spherical inclusions in a polymer matrix.

ISBN: 9781267336644Subjects--Topical Terms:

226989
Engineering, Chemical.

Polymer Physics of Nanocomposites.
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502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 2012.
520 $a Addition of nanoparticles to polymer melts can significantly alter the mechanical properties and structure of the resulting composite systems. In order to address the influence of particle shape on nanocomposite behavior, extensive Monte Carlo and molecular dynamics simulations are used to examine the structure and deformation behavior of a model polymer upon addition of rods with varying aspect ratios. Such systems were examined at equilibrium, as well as at numerous non-equilbrium states induced by cooling and deformation. Past theoretical and computational studies of polymer nanocomposites have largely focused on spherical inclusions in a polymer matrix.
520 $a It is found that the additives studied notably increased elastic modulus, strain at yield, and harding modulus as compared to the pure polymer. However, the strengthening of the polymer matrix observed is found to coincide with an increase in the spatial mechanical and dynamic heterogeneity. It was observed that for both pure polymers and nanocomposites, regions of low local elastic modulus are more prone to failure. This leads to earlier cavitation in composite systems than pure polymer due to the increased heterogeneity. It was also found that Voronoi volume can anticipate void formation and that it is also a predictor of failure, particularly in composites. Since the work of Eyring, it has been accepted that the application of stress can alter the state of a glassy system. Surprisingly, that nanocomposite glassy heterogeneity is less susceptible to change upon deformation than that of the pure polymer. Lastly, exploration of entanglements found that nanoparticles enrich the nanocomposite system by nucleating additional topological constraints of polymer-particle origin, but do not change the number of polymer-polymer entanglments.
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