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Behavior of several amphiphilic copo...

Bernard, Sophie.

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Behavior of several amphiphilic copolymers at the air-water interface.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Behavior of several amphiphilic copolymers at the air-water interface./
Author:	Bernard, Sophie.
Description:	153 p.
Notes:	Adviser: Randolph S. Duran.
Contained By:	Dissertation Abstracts International69-02B.
Subject:	Chemistry, Physical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3300711
ISBN:	9780549460008

Behavior of several amphiphilic copolymers at the air-water interface.
Bernard, Sophie.

Behavior of several amphiphilic copolymers at the air-water interface. - 153 p.

Adviser: Randolph S. Duran.

Thesis (Ph.D.)--University of Florida, 2007.

The two-dimensional structure of amphiphilic copolymers is studied at the air-water interface using Langmuir-Blodgett methods, atomic force microscopy (AFM), and Brewster angle microscopy (BAM). Measurements are made for several block copolymers containing polystyrene (PS), poly(ethylene oxide) (PEO), poly(tert-butylacrylate) (PtBA) and polycaprolactone (PCL).

ISBN: 9780549460008Subjects--Topical Terms:

560527
Chemistry, Physical.

Behavior of several amphiphilic copolymers at the air-water interface.
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020 $a 9780549460008
035 $a (UMI)AAI3300711
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100 1 $a Bernard, Sophie. $3 1280791
245 1 0 $a Behavior of several amphiphilic copolymers at the air-water interface.
300 $a 153 p.
500 $a Adviser: Randolph S. Duran.
500 $a Source: Dissertation Abstracts International, Volume: 69-02, Section: B, page: 1025.
502 $a Thesis (Ph.D.)--University of Florida, 2007.
520 $a The two-dimensional structure of amphiphilic copolymers is studied at the air-water interface using Langmuir-Blodgett methods, atomic force microscopy (AFM), and Brewster angle microscopy (BAM). Measurements are made for several block copolymers containing polystyrene (PS), poly(ethylene oxide) (PEO), poly(tert-butylacrylate) (PtBA) and polycaprolactone (PCL).
520 $a Measurements are also made for blends of the PS-b-PEO copolymer with both a PS and a PEO homopolymer. When increasing the amount of PS homopolymer, the isotherms do not show any change in the high surface area region. However, a linear dependence of the condensed area is observed. An increase in the PEO ratio has an effect on the biphasic region of the isotherms but no change is detected for the condensed area. The AFM data indicate a significant effect of the homopolymers on the monolayer structure. In fact depending on the homopolymer added, a change in the chaining behavior of the copolymer is observed. Also, when introducing more PEO, a phase separation between the layer of PEO and clusters of two-dimensional micelles is detected.
520 $a The PS-b-PtBA copolymers investigated are star-shaped copolymers with a polystyrene (PS) core and a poly(tert-butylacrylate) (PtBA) corona. They were prepared with a constant PS block and three different PtBA block lengths. A transition can be observed for the three copolymers with a plateau's length depending on the PtBA composition. The images obtained by AFM are in agreement with the isotherms showing the evidence of a phase transition around 24mN/m. In fact for the three copolymers, below the plateau only single domains are observed whereas for pressures higher than 24mN/m, aggregates can be detected. Transfer experiments were performed after several equilibration times. The structure of the film formed seems to be dependant on the time waited before performing the transfer, showing more compact films when the time waited was longer.
520 $a Poly(ethylene oxide)-block-Polycaprolactone (PEO- b-PCL) copolymers are also studied in this work. Their behavior and the PCL crystallization process at the air-water interface is investigated using BAM. The formation of crystals directly on the water subphase is illustrated and compared to the pictures obtained by AFM.
590 $a School code: 0070.
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0494
690 $a 0495
710 2 $a University of Florida. $3 718949
773 0 $t Dissertation Abstracts International $g 69-02B.
790 $a 0070
790 1 0 $a Duran, Randolph S., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3300711