Results 261 to 270 of about 92,642 (284)

Thermal Stabilities of Different Polyurethanes After Hydrolytic Treatment

Journal of Thermal Analysis and Calorimetry, 1998
Different polyester urethanes and polyether urethanes were exposed to hydrolytic degradation at 70°C for up to 16 weeks. The dried samples were subsequently analysed in thermooxidation tests in the range 250-300°C by measuring the lifetime relating to 5% mass loss.
Fambri, Luca, Pegoretti, Alessandro, J. Kolarik, C. Gavazza, Penati, Amabile   +4 more
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Hydrolytic stability of synthetic ester lubricants

Journal of Synthetic Lubrication, 2000
AbstractThis paper looks in detail at hydrolysis of esters. While this is not normally a problem, hydrolytic stability can be an important consideration, e.g., in air compressors. The paper looks first at the synthesis of esters, which is a reversible reaction of acid + alcohol ↔ ester + water, usually involving a catalyst.
openaire   +1 more source

Hydrolytic stability of some uncured epoxy resins

Journal of Applied Polymer Science, 1981
AbstractThe hydrolytic stability of triglycidyl(4‐aminophenol) (ERL 0500), tetraglycidyl(methylenedianiline) (MY720), and a number of model compounds has been investigated. It has been shown that at 60°C and 96% relative humidity undiluted N‐glycidyl aromatic amine‐based epoxy resins readily undergo hydrolysis followed by homopolymerization. Impurities
P. J. Pearce, R. G. Davidson, C. E. M. Morris   +2 more
openaire   +1 more source

Hydrolytic stabilities of some polyurethane hydrogels

Journal of Applied Polymer Science, 1991
AbstractThe hydrolytic stability of some polyurethane hydrogels derived from UV‐curable urethane prepolymers and hydrophilic monomers was addressed. It was found that polyurethane hydrogels derived from prepolymers with hydrophilic polypropylene glycol soft segments were not stable when the films were cast from nonpolar solvent, whereas they are stable
openaire   +1 more source

Hydrolytic Stability of Phosphate Ester Surfactants

1997
The unique properties of phosphate ester surfactants make them highly functional components in a multitude of formulations throughout the agricultural industry. Synthetic routes leading to the formation of phosphate esters are relatively well understood.
DG Anderson, WJ Eberle, DR Stubbs
openaire   +1 more source

Hydrolytic Stability of a New Urethane Elastomer

Rubber Chemistry and Technology, 1971
Abstract A new polyether based liquid casting urethane elastomer having excellent abrasion resistance, improved electrical properties, and superior hydrolytic stability has been described. A good balance of working life, physical properties, and overall handling ease are provided when MDA is used as the curing agent.
F. O'Shaughnessy, G. K. Hoeschele
openaire   +1 more source

Hydrolytic stability of sulfonated poly(butylene terephthalate)

Polymer, 2003
The hydrolysis of sulfonated poly(butylene terephthalate) copolymers was studied. Sulfonated poly(butylene terephthalate) copolymers, referred to as PBT-ionomers (PBTIs), were shown to hydrolyze faster than poly(butylene terephthalate) (PBT). An experiment designed to isolate the effect of the sulfonated isophthalate (SIP) moieties on hydrolysis rate ...
Chisholm B. J., Sisti L., Soloveichik S., Gillette G.   +3 more
openaire   +2 more sources

On the hydrolytic stability of polyester yarns

Journal of Materials Science, 2007
The relationships between strength, molecular weight and the rate of hydrolytic attack are determined for two polyester fibres which differ in their carboxyl end group concentration. Chemical and physical tests are described briefly and predictions are made of the rates of hydrolysis at ambient and other temperatures.
C. J. Burgoyne, A. L. Merii
openaire   +1 more source

Hydrolytic stability of unsaturated polyester prepolymers

Composites Science and Technology, 1996
Abstract Polyester prepolymers were used as model compounds of the corresponding networks in a study of relationships between structure and hydrolytic stability. A comparison of various types of prepolymers allowed us to establish that the hydrolytic stabilities are in the order: propylene glycol (PG)
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“Thermal and hydrolytic stability of urethane resins”

1969 9th Electrical Insulation Conference, 1969
Urethane resins in recent years have become accepted in the electrical field for use as wire enamels, conformal coatings, potting and encapsulating compounds. These resins are prepared through the reaction of a polyfunctional isocyanate with a polyfunctional hydroxyl (polyol) or amine containing compound.
A. Ehrlich, J. W. Hayes
openaire   +1 more source