Abstract:
An interpenetrating or semi interpenetrating polymer network comprises first and second network polymers, wherein at least the first network polymer comprises a rheopectic and/or a dilatant material.
Abstract:
The present invention describes a composition of thermosetting resins, in particular epoxy resins, combined with modified polysiloxane networks to form a continuous interpenetrated network characterized by the presence of metals such as boron, molybdenum and tungsten, linked to Si via an oxygen atom. These compositions, can be used to make adhesives, composites and coatings that exhibit excellent hardness, chemical resistance, fast curing, damp tolerance and are self priming with slow release of a corrosion inhibitor or of functional additives. The material of the present invention can be used in particular as a coating, in the marine field, for yachts and for large metal vessels, such as oil tankers and more in particular for cargo or ballast tanks and on hulls. It can be used for the maintenance and protection of trains, automotive vehicles and in electric applications such as for the production of dielectric shields and in those fields where high performance is needed.
Abstract:
A precursor composition includes: (1) at least one cross-linking compound represented by formula (I) wherein: u and x are independently selected positive integers, v and w are independently selected integers greater than or equal to zero, R , R , R , R , R , R , R and R are independently selected from the group consisting of alkyl, aryl, alkylaryl, haloalkyl, haloaryl, and mixtures thereof; A and E are independently selected from the group consisting of O, an aliphatic bridge, an aryl bridge and mixtures thereof; and R and R are unsubstituted or substituted vinyl or ethynyl groups; (2) at least one organosilicon compound containing at least two silicon hybride moieties per molecule, and (3) a hydrosilation catalyst. A cross-linked polymer is formed by reacting the cross-linking compound of formula (I) with the organosilicon compound via a hydrosilation reaction. A thermoset polymer is formed by thermally curing the cross-linked polymer. A boron-carbon-silicon ceramic formed by pyrolyzing the cross-linked polymer.
Abstract:
The invention concerns molecular silylalkylboranes, a process for preparing them, oligo or polyborocarbosilazanes, a process for preparing them and their use, as well as silicon carbonitride ceramics and a process for preparing them.
Abstract:
A novel organoboron polymer and its method of preparation is claimed. The organoboron polymer has a backbone having a repeating unit comprising at least one carboranyl group, at least two acetylenic groups, and one or more silyl or siloxanyl groups.
Abstract:
This invention relates to a new class of inorganic-organic hybrid thermosetting polymers and ceramics that are formed from new linear polymers of varying molecular weight and varying carborane content. These new organoboron thermoset polymers and ceramics contain an unsaturated cross-linking moiety and exhibit a differential scanning calorimetry plot of heat flow versus temperature in nitrogen obtained at a heating rate of 10 degrees celsius/minute, as shown in the Figure.
Abstract:
This invention relates to a new class of novel inorganic-organic hybrid polymers that are formed from linear inorganic-organic hybrid polymers of varying molecular weight. These new high temperature oxidatively stable thermosetting polymers are formed from linear polymeric materials having repeat units that contain at least one alkynyl group for cross-linking purposes and at least one bis(silyl or siloxanyl)carboranyl group. These novel organoboron thermoset polymers contain an unsaturated cross-linked hydrocarbon moiety. These inorganic-organic hybrid polymers can be further converted into ceramics at elevated temperatures to prepare engine parts, turbine blades and matrices.
Abstract:
The invention relates to a method for manufacturing a self-healing elastomer (100), comprising preparing, with respect to the total weight of the self-healing elastomer (100), 0.1 - 5 wt.% of boron trioxide (B2O3), 65 - 90 wt.% of hydroxyl- terminated polydimethylsiloxane (PDMS-OH), 5 – 30 wt.%, when measured in combined, of polysiloxane precursors (201), being a first composition (201a) comprising a siloxane base, and a second composition (201b) comprising a siloxane crosslinker, wherein the ratio by weight of the first composition (201a) and the second composition (201b) is 1:1 to 50:1; reacting B2O3 and PDMS- OH at an elevated temperature ranging from 60 ˚C to 200 ˚C, endpoints inclusive, thereby obtaining a first mixture (101), mixing the first mixture (101) with an alcohol, and then the first composition (201a), thereby obtaining a second mixture (102), reacting the second mixture (102) and the second composition (201b), thereby obtaining the self-healing elastomer (100).
Abstract:
A therapeutic or exercise putty includes a boronated silicone elastomer serving as the base ingredient and copper sulfate, zinc sulfate, copper oxide, zinc oxide or zinc pyrithione as a secondary ingredient mixed with the base putty or in combination with an antistatic ingredient. The inclusion of any one of the aforementioned secondary ingredients or the antistatic ingredient will reduce the risk of transmission of or infection from viruses, bacteria and microbial pathogens in or on the surface of the putty when the putty is used for hand rehabilitation or exercise by patients.
Abstract:
A curable hybrid sol-gel composition includes the combination of: (a) a first sol comprising the combination of (i) a hydrolysable silicon alkoxide and (ii) a silicon alkoxide having a least one non-hydrolysable substituent bonded to the silicon atom; and (b) a second sol comprising the combination of (i) a hydrolysable metal oxide in which the central metal atom is selected from the group consisting of Ti, Zr, Al, B, Sn, and V, and (ii) a (meth)acrylic acid-functional component. The cured composition is useful in a variety of compositions, e.g., as an anti-corrosion coating for metal substrates.