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Non-equilibrium liquid-liquid phase ...

Lee, Hwan-Kwang.

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Non-equilibrium liquid-liquid phase separation in crystallizable polymer solutions.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Non-equilibrium liquid-liquid phase separation in crystallizable polymer solutions./
作者:	Lee, Hwan-Kwang.
面頁冊數:	169 p.
附註:	Co-Advisers: Kalle Levon; Allan S. Myerson.
Contained By:	Dissertation Abstracts International53-07B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9230070

Non-equilibrium liquid-liquid phase separation in crystallizable polymer solutions.
Lee, Hwan-Kwang.

Non-equilibrium liquid-liquid phase separation in crystallizable polymer solutions. - 169 p.

Co-Advisers: Kalle Levon; Allan S. Myerson.

Thesis (Ph.D.)--Polytechnic University, 1992.

A systematic change in the phase separation behavior of isotactic polypropylene (i-PP) solutions was obtained by the proper selection of solvents. A series of dialkylphthalates, with a different number of carbon atoms in the alkyl chain, was used to control the solvent quality. The liquid-liquid (L-L) phase separation temperature decreased significantly when the interaction became favorable while the melting point curve remained essentially constant. As the result of this systematic change in the polymer-solvent interaction, the L-L phase separation was observed under non-equilibrium conditions below the equilibrium liquid-solid transition. L-L phase separation of i-PP solutions with strong interaction, in which the L-L phase separation cannot be observed in situ due to competing crystallization, was probed using atactic-polypropylene (a-PP) with the same solvent system. In polydisperse samples, fractionation during liquid demixing resulted in bimodal behavior of the L-L transition and deviation of melting points in the biphasic region. An additional feature observed under the non-equilibrium conditions is the L-L phase separation induced by crystallization where concentration and temperature regions are outside the binodal curve. The competition between L-L phase separation and crystallization in the i-PP solutions was investigated by changing the cooling conditions. Crystallization was found to be more sensitive to the change in cooling rate than liquid demixing.Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Non-equilibrium liquid-liquid phase separation in crystallizable polymer solutions.
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035 $a (UnM)AAI9230070
035 $a AAI9230070
040 $a UnM $c UnM
100 1 $a Lee, Hwan-Kwang. $3 1254545
245 1 0 $a Non-equilibrium liquid-liquid phase separation in crystallizable polymer solutions.
300 $a 169 p.
500 $a Co-Advisers: Kalle Levon; Allan S. Myerson.
500 $a Source: Dissertation Abstracts International, Volume: 53-07, Section: B, page: 3514.
502 $a Thesis (Ph.D.)--Polytechnic University, 1992.
520 $a A systematic change in the phase separation behavior of isotactic polypropylene (i-PP) solutions was obtained by the proper selection of solvents. A series of dialkylphthalates, with a different number of carbon atoms in the alkyl chain, was used to control the solvent quality. The liquid-liquid (L-L) phase separation temperature decreased significantly when the interaction became favorable while the melting point curve remained essentially constant. As the result of this systematic change in the polymer-solvent interaction, the L-L phase separation was observed under non-equilibrium conditions below the equilibrium liquid-solid transition. L-L phase separation of i-PP solutions with strong interaction, in which the L-L phase separation cannot be observed in situ due to competing crystallization, was probed using atactic-polypropylene (a-PP) with the same solvent system. In polydisperse samples, fractionation during liquid demixing resulted in bimodal behavior of the L-L transition and deviation of melting points in the biphasic region. An additional feature observed under the non-equilibrium conditions is the L-L phase separation induced by crystallization where concentration and temperature regions are outside the binodal curve. The competition between L-L phase separation and crystallization in the i-PP solutions was investigated by changing the cooling conditions. Crystallization was found to be more sensitive to the change in cooling rate than liquid demixing.
520 $a Various thermal quench conditions were applied to the i-PP solutions of the critical concentration to control systematically L-L phase separation and crystallization. When crystallization occurs in a temperature range above the upper critical solution temperature (UCST), a spherulitic growth is followed by dendrite formation. The dendrites start to appear at the earlier stage of crystallization with higher supercooling. During simultaneous phase transitions, slow crystallization elongates the liquid droplets in the radial direction of a spherulite, but rapid crystallization locks-in the growth of L-L phase separation. These results indicate that the extent of L-L phase separation which exists below the melting point is successfully controlled through the proper selection of solvent and thermal conditions.
590 $a School code: 0179.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Engineering, Materials Science. $3 1017759
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710 2 0 $a Polytechnic University. $3 1249856
773 0 $t Dissertation Abstracts International $g 53-07B.
790 $a 0179
790 1 0 $a Levon, Kalle, $e advisor
790 1 0 $a Myerson, Allan S., $e advisor
791 $a Ph.D.
792 $a 1992
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9230070