Vapour Pressure Measurements of Germa nium Disulphide

Shimazaki, Eiichi; Matsumoto, Noboru

doi:10.1246/nikkashi1948.77.1089

Cited by 5 publications

(2 citation statements)

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“…Noteworthy characteristic points in this interval were taken as the termination of t,hc initial stage mid thc gel point. Additiona1 problems :Ire as follows: (1) how t,b: tertih:Ltioti of the initial stage is reflected in changes i i i viscosit8y; ( 2 ) how t . 1~ gel point det,ermined by the torsion niethod is observed in viscoel:Lst(ic 1)elittvior; :~iid ( 3 ) t,o what extent uhemic d changes are observed :~t the gel point.…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic changes of epoxy resin–acid anhydride system during curing

Shimazaki

1968

J of Applied Polymer Sci

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synopsisThe changed viscoelastic properties of the epoxy resin-acid anhydride system, Epikote 834-HHPA, are followed to the gel point a t 130, 140, and 150°C with a dynamic viscoelastometer. The viscosity increases with curing time through two inflections designated A and B. The point A is interpreted (from the reference to the chemical changes reported in the previous paper) as the termination of the initial stage of this curing reaction, and point B coincides with the gel point determined by the torsion method. The resonance frequency remains constant value up to the point B, followed by a rapid increase. The extents of reaction for epoxide, anhydride, and initial OH are 15, 45.8, and 100% a t the point A; 27.8, 63.7, arid 100% a t the point B, respectively. The apparent activation energies for viscosity are 7.5 kcal/mole for the resin mixture before curing, 10.5 kcal/mole for point A, 48.8 kcal/mole for point B (gel point). The overall apparent activation energies of this curing reaction are obtained from the Arrhenius plots for the curing time required for the resin mixture to reach the state of the points A and B; these values were 8.9 kcal/mole for point A and 16.2 kcal/mole for point B.

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Section: Introductionmentioning

confidence: 99%

Viscoelastic changes of epoxy resin–acid anhydride system during curing

Shimazaki

1968

J of Applied Polymer Sci

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“…A plenitude of reports of thermodynamic studies of the high-temperature reactions of GeS 2 is available in the literature, and D f H°m at T = 298.15 K can be estimated from most of them by means of second-and third-law calculations. Much of that research, (30)(31)(32)(33)(34)(35)(36)(37) first discussed in detail by Mills (11) and later by Gurvich et al (12) and ourselves, (10) deals with the decomposition: GeS 2 (cr) = GeS(g) + 1 2 S 2 (g).…”

Section: Discussionmentioning

confidence: 99%