Abstract
The study of the glass transition in miscible blends is an
important area of polymer research because this transition is
crucial to understanding miscible blend behavior. There are two
main theoretical ideas, self-concentration and thermal
concentration fluctuations, that define blend component behavior
during the glass transition and the relevant length scale of blend
interactions. This project has two parts that use a relatively new
fluorescence technique to measure the glass transition temperature
( Tg) of individual components within polymer blends with
the aim of providing insight into miscible blend Tg
behavior. In part one, the Tg of polystyrene (PS) was
measured in bulk PS/poly(vinyl methyl ether) (PVME) blends for a
range of compositions, and in part two, the Tg deviation
with varying distance from a PS/PVME interface in a four-layer
PS/PVME system was investigated. Unfortunately, there were
experimental issues in both parts of the project that will require
some re-measuring of the data presented.
Table of Contents
I. Introduction
..............................................................................................
1
The Glass Transition and Miscible Blends
............................................................
1
Tg Measurement Techniques
...........................................................................
2
Miscible Blend Behavior
..................................................................................
5
Self-Concentration and Thermal Concentration
Fluctuations ...................................
6
Interfaces and Multilayer Systems
....................................................................
8
Purpose
........................................................................................................
10
II. Experimental
............................................................................................
10
Pyrene Monomer Synthesis
.............................................................................
10
Polymer Synthesis
..........................................................................................
11
Part
I...........................................................................................................
11
Part
II..........................................................................................................
11
Sample Preparation
.......................................................................................
12
Part
I...........................................................................................................
12
Part
II..........................................................................................................
12
Fluorimeter Procedure
....................................................................................
13
III. Results and
Discussion
..............................................................................
14
Part I
..........................................................................................................
14
Part
II..........................................................................................................
20
IV. Conclusions
..............................................................................................
22
Part I
..........................................................................................................
22
Part II
.........................................................................................................
23
References
..................................................................................................
25
About this Honors Thesis
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