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Thermodynamics and kinetics of phase...

Lee, Hak-soo.

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Thermodynamics and kinetics of phase separation in functional prepolymer mixtures and networks.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Thermodynamics and kinetics of phase separation in functional prepolymer mixtures and networks./
Author:	Lee, Hak-soo.
Description:	228 p.
Notes:	Source: Dissertation Abstracts International, Volume: 52-08, Section: B, page: 4346.
Contained By:	Dissertation Abstracts International52-08B.
Subject:	Engineering, Chemical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9203423

Thermodynamics and kinetics of phase separation in functional prepolymer mixtures and networks.
Lee, Hak-soo.

Thermodynamics and kinetics of phase separation in functional prepolymer mixtures and networks. - 228 p.

Source: Dissertation Abstracts International, Volume: 52-08, Section: B, page: 4346.

Thesis (Ph.D.)--The University of Akron, 1991.

Phase behavior of functional prepolymer mixtures was studied to gain better insight into network structure, their mechanical and rheo-optical performance. Functional prepolymers used in this study were diglycidyl ether bisphenol A (DGEBA), carboxyl-terminated butadiene nitrile rubber (CTBN), hydroxyl-terminated polyisobutylene (HO-PIB-OH), tetrahydrofuran diol (HO-PTHF-OH), hydroxyl-terminated polybutadiene (HO-PB-OH).Subjects--Topical Terms:

1018531
Engineering, Chemical.

Thermodynamics and kinetics of phase separation in functional prepolymer mixtures and networks.
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008 130614s1991 eng d
035 $a (UnM)AAI9203423
035 $a AAI9203423
040 $a UnM $c UnM
100 1 $a Lee, Hak-soo. $3 1927641
245 1 0 $a Thermodynamics and kinetics of phase separation in functional prepolymer mixtures and networks.
300 $a 228 p.
500 $a Source: Dissertation Abstracts International, Volume: 52-08, Section: B, page: 4346.
502 $a Thesis (Ph.D.)--The University of Akron, 1991.
520 $a Phase behavior of functional prepolymer mixtures was studied to gain better insight into network structure, their mechanical and rheo-optical performance. Functional prepolymers used in this study were diglycidyl ether bisphenol A (DGEBA), carboxyl-terminated butadiene nitrile rubber (CTBN), hydroxyl-terminated polyisobutylene (HO-PIB-OH), tetrahydrofuran diol (HO-PTHF-OH), hydroxyl-terminated polybutadiene (HO-PB-OH).
520 $a Uncrosslinked prepolymer mixtures showed a reversible upper critical solution temperature (UCST) behavior. Temperature quench experiments were performed from a single phase to a biphasic region. Thermally induced phase separation was monitored by time-resolved light scattering. Time evolution of scattering profiles was analyzed by the linearized Cahn-Hilliard (CH) theory for the initial stage of spinodal decomposition (SD) and by the dynamic scaling laws for the late growth regime.
520 $a Crosslinking reaction-induced phase separation of DGEBA/CTBN was studied by means of time-resolved light scattering. The early stage of SD was not detected. The late stages of SD were analyzed in terms of the power law and dynamic scaling theories.
520 $a Thermally induced phase separation studies were also undertaken for HO-PB-OH/HO-PTHF-OH and HO-PIB-OH/HO-PTHF-OH mixtures.
520 $a Melting points and cloud points for the mixture of HO-PB-OH and HO-PTHF-OH were measured by means of differential scanning calorimetry and small angle light scattering. The Hoffman-Weeks approach was utilized to obtain the equilibrium melting points. In contrast to a polymeric system, the prepolymer mixture shows little or no dependence on the crystallization conditions. That is, the change of melting point is almost negligible irrespective of the crystallization temperatures. Interaction parameters, as obtained on the basis of Flory's diluent theory, increase with increasing molecular weight (M $\ sb{\rm n} $) of the HO-PTHF-OH.
520 $a Model networks were prepared from the HO-PIB-OH and HO-PTHF-OH using triphenyl methane triisocyanate (TTI) as a crosslinking agent. Mechanical, optical and thermal properties of model networks were investigated. These physical properties are strongly dependent on the M $\ sb{\rm n} $ of HO-PTHF-OH. The higher the M $\ sb{\rm n} $ of HO-PTHF-OH, the closer the extensional behavior to a Gaussian network. The strong dependence of the glass transition on the molecular weight of the prepolymers was observed. Stress - strain behavior of the crosslinked networks follow the three-chain model. Mooney-Rivlin treatment gives the results that C $\ sb2 $ $\ cong $ 0 and C $\ sb1 $, where C $\ sb1 $ and C $\ sb2 $ are Mooney-Rivlin constants, decreased with increasing M $\ sb{\rm n} $ of HO-PTHF-OHs. Birefringence studies revealed that the stress optical law is operative at low stress levels, however it deviates at higher stress levels.
590 $a School code: 0003.
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0542
690 $a 0495
710 2 0 $a The University of Akron. $3 1018399
773 0 $t Dissertation Abstracts International $g 52-08B.
790 $a 0003
791 $a Ph.D.
792 $a 1991
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9203423