摘要:
Organic inherently conductive polymers, such as those based on polyaniline, polypyrrole and polythiophene, are formed in-situ onto polymeric surfaces that are chemically activated to bond ionically the conductive polymers to the substrates. The polymeric substrate is preferably a preshaped or preformed thermoplastic film, fabric, or tube, although other forms of thermoplastic and thermoset polymers can be used as the substrates for pretreatment using, most preferably, phosphonylation-based processes followed by exposure to an oxidatively polymerizable compound capable of forming an electrically conductive polymer. The resultant conductive surface imparts unique properties to the substrates and allows their use in antistatic clothing, surface conducting films for electronic components and the like, and electromagnetic interference shielding. In an alternative embodiment, metals such as gold or platinum are bonded to the chemically interactive surface of a preshaped thermoplastic or thermoset article.
摘要:
A crystalline polylactone is produced having reactive acrylate end groups. When incorporated into a thermosetting resin which includes reactive C.dbd.CH.sub.2 sites, the present functionalized polylactone acts as a toughener, greatly increasing the impact resistance of the final cured product. Also disclosed are carboxyl-bearing polylactones as tougheners for epoxy resin systems.
摘要:
A polymeric composition for use in medicine includes a hydrophobic bioabsorbable polymer admixed with a hydrophilic liquid polymer wherein the polymeric composition undergoes macroscopic phase separation on contact with aqueous media. The polymeric composition optionally includes a medicinal agent. The polymeric composition may be deposited as a permeable, semipermeable or occlusive irregular mass, regular mass, film or foam over a suitable surface such viable body tissue. Bioabsorbable implants formed from the polymeric composition may assume a variety of three dimensional configurations such as planar, spherical, cylindrical, rectangular and polygonal.
摘要:
The present invention is directed to polymeric bone fixation devices and processes for making the devices. In making the bone fixation devices, a polymeric material having a crystalline portion is deformed by a compressive force along a particular direction which causes molecular chains contained within the polymer to orient. The resulting polymer has increased mechanical properties including increased tensile strength and modulus. The polymeric material used to make the bone fixation device can be a bioabsorbable polymer which, once implanted, is broken down and absorbed by the patient's body, eliminating the need for removal.
摘要:
Tissue adhesive compositions are disclosed which comprise at least one 2-noacrylate ester of the general formula (I) ##STR1## in admixture with from about 2 percent to about 25 percent of at least one oxalic acid polymer of the general formula (II) ##STR2##
摘要:
Poly(1,4-benzodioxepin-2,5-(3-H)dione), poly(1,4-benzodioxepin-2,5-(3-H, 3-methyl)dione), and copolymers of 1,4-benzodioxepin-2,5-(3-H)dione or 1,4-benzodioxepin-2,5-(3-H, 3-methyl)dione and at least one of: a) glycolide, b) (L-)lactide, c) an alkylene carbonate, d) p-dioxanone, e) e-caprolactone, f) 1,4-dioxepan-2-one, or g) 1,5-dioxepan-2-one.Surgical devices prepared from the polymers and copolymers.
摘要:
The present invention provides acylated epidermal growth factor derivatives, methods of making the derivatives and pharmaceutical compositions containing the derivatives.
摘要:
Bioabsorbable copolymers comprising .rho.-dioxanone and AA-BB type polyalkylene carbonates are provided. The copolymers are useful in the fabrication of sterile surgical articles and bioabsorbable coatings for sutures and are produced from organic carbonates by way of prepolymeric synthetic intermediates.
摘要:
Postsurgical adhesion formation is inhibited by the topical administration to the site of surgical trauma of a non-steroidal anti-inflammatory drug, preferably ibuprofen, suprofen, or tolmetin.
摘要:
Block copolymers of glycolide and p-dioxanone are produced by reacting poly(p-dioxanone) that is substantially free of p-dioxanone monomer with glycolide.