摘要:
The present invention relates to novel compositions of matter comprising fullerenes and polymers, wherein the fullerenes are combined with the polymer in an amount sufficient to result in a change or modification in the viscoelastic properties of the resulting composition from that of the unmodified polymer typically within the range of from about 0.01 wt. % to about 85 wt. %. Also included in the present invention is the process for making the novel fullerene-polymer compositions and the products produced by the process disclosed therein. The novel compositions show changes in the viscoelastic properties in comparison to the unmodified polymer, and hence, have utility in any application in which the unmodified polymer may be used, but wherein the application would benefit from the resulting change in the viscoelastic properties.
摘要:
Tire innerliners and inner tubes are prepared from blends of general purpose rubbers and silicate clay. The clays provide the requisite low air permeability without adversely affecting the flexibility of the rubber composition.
摘要:
Tire innerliners and inner tubes are prepared from blends of general purpose rubbers and silicate clay. The clays provide the requisite low air permeability without adversely affecting the flexibility of the rubber composition.
摘要:
Elastomeric compositions comprising graphite nanoparticles (preferably graphene nanoparticles) and methods for making same. Such compositions are useful for tire innertubes and tire innerliners.
摘要:
The present invention provides a process for producing high elongation elastomers and highly oriented films and fibers from polymers having specific associative groups, such that the end groups on each macromolecule tend to associate with one another after the macromolecules are in a disentangled state, i.e., in the form of a semi-dilute solution. This association is of a force strong enough to prevent the macromolecular chains from slipping past one another and reentangling when the polymer is moderately heated or further concentrated in solution. The association may be manipulated, i.e., is reversible, under a change in parameter such as temperature, pH, polarity of the solvent medium and like parameters. The associated polymer macromolecules can be drawn as a gel from a semi-dilute solution into a highly aligned disentangled polymer to yield shaped articles.
摘要:
Polymers of olefin monomers and a substantially uniform concentration of carboxyl, hydroxyl, thio, amino, cabonyl and imino functional group-containing monomers. Polymers of olefin monomers and carboxyl, hydroxyl, thio, amino, carbonyl and imino functional group-containing monomers substantially devoid of halogen. Method for preparing polymers by reacting carboxyl, hydroxyl, thio, amino, carbonyl and imino functional group-containing monomers with non-halogenated organometallic compounds to form masked, functional group-containing monomers and polymerizing polymer chain monomers with the masked, functional group-containing monomers to produce a polymer chain. Method for forming masked, functional group-containing monomers by reacting carboxyl, hydroxyl, thio, amino, carbonyl and imino functional group-containing monomers with non-halogenated organometallic compounds. Masked, carboxyl, hydroxyl, thio, amino, carbonyl and imino functional group-containing monomers.
摘要:
By selecting the composition and intermolecular compositional distribution with respect to ethylene and diene content and the molecular weight and molecular weight distribution, ethylene-propylene-diene terpolymers can have both improved processing properties and compound vulcanizate physical properties. The lower molecular weight fractions of 10.sup.4 to about 5.times.10.sup.5 have at least 2 times the diene content of the higher molecular weight fractions and an ethylene content of 30-80 wt. %. The higher molecular weight fractions of 2.times.10.sup.5 to about 10.sup.7 have a higher ethylene content than the lower molecular weight fractions and are less than 90 wt. % ethylene.
摘要:
A process for sulfonating polymers which are prepared by solution polymerization using a Friedel-Crafts or Ziegler-type catalyst is disclosed. The reactor effluent containing polymer, unreacted light monomers, diluent-solvent and active catalyst is first treated to remove substantially all unreacted light monomer, e.g. by flashing. The effluent is then treated with a sulfonating agent (e.g. acetyl sulfate and acetic acid) which simultaneously deactivates catalyst. Thereafter, the sulfonated polymer is neutralized, e.g. by exposure to metal salts, organic amines, etc., and subjected to normal finishing operations, e.g. deashing, steam stripping, stabilizing and drying.
摘要:
This invention is directed to mono- and bis-substituted oxetane monomers having fluorinated alkoxymethylene side chains, hydroxy-terminated prepolymers derived from these mono- and bis-substituted oxetane monomers and tetrahydrofuran (THF), and polymers produced from these prepolymers, as well as the synthesis processes associated with each, and the use of the monomers, prepolymers and ultimate polymers, both directly and as components of numerous compositions.
摘要:
The present invention relates to a process for the encapsulation of a solid substrate with a neutralized sulfonated polymer, which comprises the steps of: (a) forming a solution of a non-conjugated, diene polymer in a solvent selected from the group consisting of aliphatic, aromatic hydrocarbons and mixtures thereof; (b) contacting the solution of the unsaturated polymer with a sulfonating agent at a sufficient temperature and for a sufficient period of time to form a solution of a sulfonated polymer containing free acid; (c) forming a solution of a base selected from the group consisting of alkali metal hydroxides and mixtures thereof in a mixtrue of an aliphatic alcohol and a hydrocarbon, the hydrocarbon being selected from the group consisting of aliphatic and aromatic hydrocarbons and mixtures thereof; (d) adding the solution of base to the solution of sulfonated polymer in an amount sufficient to neutralize the polymer and the free acid, thereby forming a coating solution; (e) contacting the solid substrate with the coating solution while removing the solvent therefrom, thereby forming an encapsulated substrate. In a preferred embodiment, the solvent removed during step (e) is recovered and distilled to separate the solvent into at least two fractions, a fraction containing substantially hydrocarbon and an alcohol containing fraction. The separated solvents are then recycled to dissolve the polymer in step (a) and to dissolve the base in step (c).