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Kinetics of spinodal decomposition i...

Lal, Jyotsana.

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Kinetics of spinodal decomposition in polymer solutions and gels.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Kinetics of spinodal decomposition in polymer solutions and gels./
作者:	Lal, Jyotsana.
面頁冊數:	172 p.
附註:	Major Professor: Rama Bansil.
Contained By:	Dissertation Abstracts International52-03B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9122866

Kinetics of spinodal decomposition in polymer solutions and gels.
Lal, Jyotsana.

Kinetics of spinodal decomposition in polymer solutions and gels. - 172 p.

Major Professor: Rama Bansil.

Thesis (Ph.D.)--Boston University, 1991.

In view of the recent advances in the understanding of spinodal decomposition, I have undertaken a detailed small angle light scattering (SALS) study of the spinodal decomposition kinetics in solutions of polystyrene in cyclohexane and its dependence on molecular weight and concentration of polystyrene. These studies provide the growth laws for the kinetics, the functional form of the structure factor and test for the universality of scaling concepts in polymer solutions.Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Kinetics of spinodal decomposition in polymer solutions and gels.
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005 20110429
008 110429s1991 eng d
035 $a (UnM)AAI9122866
035 $a AAI9122866
040 $a UnM $c UnM
100 1 $a Lal, Jyotsana. $3 1254542
245 1 0 $a Kinetics of spinodal decomposition in polymer solutions and gels.
300 $a 172 p.
500 $a Major Professor: Rama Bansil.
500 $a Source: Dissertation Abstracts International, Volume: 52-03, Section: B, page: 1471.
502 $a Thesis (Ph.D.)--Boston University, 1991.
520 $a In view of the recent advances in the understanding of spinodal decomposition, I have undertaken a detailed small angle light scattering (SALS) study of the spinodal decomposition kinetics in solutions of polystyrene in cyclohexane and its dependence on molecular weight and concentration of polystyrene. These studies provide the growth laws for the kinetics, the functional form of the structure factor and test for the universality of scaling concepts in polymer solutions.
520 $a I have calculated the time evolution of the structure factor using the Cahn-Hilliard-Cook (CHC) and Langer, Bar-on and Miller (LBM) models with the usual Flory-Huggins free energy function for blends and a modified version including terms upto the third virial coefficient for the solution. These calculations show that the effects of thermal fluctuations are more pronounced in the solution than in the blend. Calculations using the LBM model show that the effects of non-linearities are much more important in dilute and low molecular weight solutions compared to the highly concentrated solution where the growth of the concentration fluctuations is slow.
520 $a The kinetics of spinodal decomposition in a gelatin solution in a water/methanol mixture which undergoes a sol-gel transition simultaneously with phase separation, was also studied using SALS techniques. The phase separation process produces domains which grow to some finite size and then get frozen. The large dependence of the final domain size on temperature reflects both the effects of phase separation and gelation and is controlled by the relative rates of these two independent processes. A semi-quantitative relation predicting the dependence of final domain size on temperature was obtained.
520 $a As an application of the effect of gelation on phase separation we consider the preparation of polymeric membranes by the method of immersion precipitation. The precipitation process involves the immersion of a highly concentrated solution of gelatin-water into a non-solvent bath (methanol), prior to any demixing processes. As the methanol diffuses, the composition of the sample becomes unstable or metastable, and domains of polymer-poor phase are formed which grow out to become pores in the ultimate membrane. The size of these pores depends on the temperature and the relative rates of phase separation and gelation. Application of these effects to produce frozen viscous fingering patterns of the phase separated regions were also considered.
590 $a School code: 0017.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Statistics. $3 517247
690 $a 0463
690 $a 0495
710 2 0 $a Boston University. $3 1017454
773 0 $t Dissertation Abstracts International $g 52-03B.
790 $a 0017
790 1 0 $a Bansil, Rama, $e advisor
791 $a Ph.D.
792 $a 1991
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9122866