Conversion of polyester into heat-resistant polyamide by reacting with aromatic diamine compound II. Semibatch reaction by nitrogen gas sweeping process

Yangsoo Kim; Young-Jin Choi

doi:10.1002/app.21172

Conversion of polyester into heat-resistant polyamide by reacting with aromatic diamine compound II. Semibatch reaction by nitrogen gas sweeping process

Journal of Applied Polymer Science ◽

10.1002/app.21172 ◽

2004 ◽

Vol 94 (5) ◽

pp. 2223-2232 ◽

Cited By ~ 3

Author(s):

Yangsoo Kim ◽

Young-Jin Choi

Keyword(s):

Aromatic Diamine ◽

Sweeping Process ◽

Nitrogen Gas ◽

Heat Resistant ◽

Compound Ii ◽

Semibatch Reaction

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Conversion of polyester into heat-resistant polyamide by reacting with aromatic diamine compound

Journal of Applied Polymer Science ◽

10.1002/app.13418 ◽

2003 ◽

Vol 91 (4) ◽

pp. 2502-2512 ◽

Cited By ~ 3

Author(s):

Yangsoo Kim ◽

Hang-Duk Roh ◽

Hyung-Chan Lee

Keyword(s):

Aromatic Diamine ◽

Heat Resistant

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The Structure of Radiation Cross-Linked Poly (ethylene oxide) Gels

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100064438 ◽

1971 ◽

Vol 29 ◽

pp. 76-77

Author(s):

C. E. Cluthe ◽

G. G. Cocks

Keyword(s):

Molecular Weight ◽

Ethylene Oxide ◽

Parallel Plate ◽

Average Molecular Weight ◽

Radical Reaction ◽

Free Radical Reaction ◽

Nitrogen Gas ◽

Poly Ethylene Oxide ◽

Poly Ethylene ◽

Initial Viscosity

Aqueous solutions of a 1 weight-per cent poly (ethylene oxide) (PEO) were degassed under vacuum, transferred to a parallel plate viscometer under a nitrogen gas blanket, and exposed to Co60 gamma radiation. The Co60 source was rated at 4000 curies, and the dose ratewas 3.8x105 rads/hr. The poly (ethylene oxide) employed in the irradiations had an initial viscosity average molecular weight of 2.1 x 106.The solutions were gelled by a free radical reaction with dosages ranging from 5x104 rads to 4.8x106 rads.

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A conduction-cooled stage for high-resolution Cryo-SEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100131048 ◽

1992 ◽

Vol 50 (2) ◽

pp. 1282-1283

Author(s):

John G. Sheehan

Keyword(s):

High Resolution ◽

Liquid Nitrogen ◽

Mechanical Stability ◽

Cooling System ◽

Cold Trap ◽

Nitrogen Gas ◽

Particulate Suspensions ◽

Advantages And Disadvantages ◽

Convection Cooling ◽

Styrene Butadiene

The goal is to examine with high resolution cryo-SEM aqueous particulate suspensions used in coatings for printable paper. A metal-coating chamber for cryo-preparation of such suspensions was described previously. Here, a new conduction-cooling system for the stage and cold-trap in an SEM specimen chamber is described. Its advantages and disadvantages are compared to a convection-cooling system made by Hexland (model CT1000A) and its mechanical stability is demonstrated by examining a sample of styrene-butadiene latex.In recent high resolution cryo-SEM, some stages are cooled by conduction, others by convection. In the latter, heat is convected from the specimen stage by cold nitrogen gas from a liquid-nitrogen cooled evaporative heat exchanger. The advantage is the fast cooling: the Hexland CT1000A cools the stage from ambient temperature to 88 K in about 20 min. However it consumes huge amounts of liquid-nitrogen and nitrogen gas: about 1 ℓ/h of liquid-nitrogen and 400 gm/h of nitrogen gas. Its liquid-nitrogen vessel must be re-filled at least every 40 min.

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