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Molecular and nanoscale reinforcemen...

Zerda, Adam S.

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Molecular and nanoscale reinforcement of polymers.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Molecular and nanoscale reinforcement of polymers./
Author:	Zerda, Adam S.
Description:	175 p.
Notes:	Director: Alan J. Lesser.
Contained By:	Dissertation Abstracts International63-10B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3068604
ISBN:	0493882154

Molecular and nanoscale reinforcement of polymers.
Zerda, Adam S.

Molecular and nanoscale reinforcement of polymers. - 175 p.

Director: Alan J. Lesser.

Thesis (Ph.D.)--University of Massachusetts Amherst, 2002.

The reinforcement of polymers using additives of dimensions below one micrometer is presented: those acting at the molecular and nanometer scales. This thesis will describe new additives and morphologies exhibiting high levels of mechanical reinforcement. It is the focus of this work to chronicle the range of physical and material properties that are altered upon inclusion of these modifiers. Additionally, this thesis will establish how these physical-property changes affect the mechanical behavior of the resulting composite.

ISBN: 0493882154Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Molecular and nanoscale reinforcement of polymers.
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005 20110505
008 110505s2002 eng d
020 $a 0493882154
035 $a (UnM)AAI3068604
035 $a AAI3068604
040 $a UnM $c UnM
100 1 $a Zerda, Adam S. $3 1256748
245 1 0 $a Molecular and nanoscale reinforcement of polymers.
300 $a 175 p.
500 $a Director: Alan J. Lesser.
500 $a Source: Dissertation Abstracts International, Volume: 63-10, Section: B, page: 4708.
502 $a Thesis (Ph.D.)--University of Massachusetts Amherst, 2002.
520 $a The reinforcement of polymers using additives of dimensions below one micrometer is presented: those acting at the molecular and nanometer scales. This thesis will describe new additives and morphologies exhibiting high levels of mechanical reinforcement. It is the focus of this work to chronicle the range of physical and material properties that are altered upon inclusion of these modifiers. Additionally, this thesis will establish how these physical-property changes affect the mechanical behavior of the resulting composite.
520 $a In the area of molecular reinforcement, a new class of additive, the organophosphate, is shown here to enhance modulus and yield strength in epoxy polymers once cured. Initially, the effect on the physical and thermal properties of the polymer system is investigated as a function of additive molecular weight, solubility, and concentration. The altered properties include T<sub> g</sub>, density, thermal stability and initial epoxy viscosity. The mechanical properties of the modified epoxy are demonstrated to be a result of the physical changes made to the matrix polymer through the addition of the organophosphorous additive. By increasing the density of the polymer and reducing or eliminating sub-T<sub>g</sub> relaxations, the modulus and yield strength of the polymer can be greatly enhanced. These property changes are investigated in a variety of epoxy polymer systems in order to elucidate the effects of both the additive and polymer chemical structure on final mechanical properties.
520 $a Polymer modification using nanometer-scale additives and modifiers has been the focus of intense study recently. Heretofore, these studies have focused on the exfoliated, or delaminated, clay morphology to impart the property enhancements, effectively isolating the particulates within the matrix. This thesis focuses on polymer modification at the nanometer scale such that the added clays interact and positively change the composite fracture toughness. By introducing this clay-clay interaction, modulus and strength can be increased together with the toughness. Such a property combination is highly desirable, as most toughening agents reduce modulus and strength. Initially, the intercalated morphology is investigated in an epoxy system. Additionally, new routes to synthesizing intercalated morphologies of clay concentrations approaching 50% are developed.
590 $a School code: 0118.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0495
690 $a 0794
710 2 0 $a University of Massachusetts Amherst. $3 1019433
773 0 $t Dissertation Abstracts International $g 63-10B.
790 $a 0118
790 1 0 $a Lesser, Alan J., $e advisor
791 $a Ph.D.
792 $a 2002
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3068604