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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.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Behavior of several amphiphilic copolymers at the air-water interface./
作者:	Bernard, Sophie.
面頁冊數:	153 p.
附註:	Adviser: Randolph S. Duran.
Contained By:	Dissertation Abstracts International69-02B.
標題:	Chemistry, Physical. -
電子資源:	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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245 1 0 $a Behavior of several amphiphilic copolymers at the air-water interface.
300 $a 153 p.
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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.
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