摘要:
High molecular weight, biodegradable polymers of substituted-poly(.beta.-propioesters), wherein the repeat unit sequences have a predominantly syndiotactic arrangement and a method of forming such polymers are disclosed. The method includes exposing a substituted-.beta.-propiolactone to a tin-based organometallic catalyst for a sufficient combination of time and temperature to form the predominantly syndiotactic substituted-poly(.beta.-propioester).
摘要:
The invention relates to new amphiphilic linear block copolymers of polysaccharides and polymers. The amphiphilic linear block copolymers do not form a true solution in water and are able to form micelles in selective solvents. Also disclosed are particles, each of which has a shell and a core, and a diameter of about 1 to 1,000 nanometers, and methods of delivering agents or removing substances, e.g., undesirable substances, from a subject or environment, by using these particles.
摘要:
A molded plastic article having improved electromagnetic interference (EMI) shielding properties. The article includes a plastic layer and an outer film layer over the plastic layer. The outer film layer has an inner surface adjacent to and bonded to the plastic layer and an outer surface opposed to the inner surface. The plastic layer and outer layer are electrically conductive. Preferably the outer layer has higher conductivity than the plastic layer.
摘要:
The invention relates to new amphiphilic linear block copolymers of polysaccharides and polymers. The amphiphilic linear block copolymers do not form a true solution in water and are able to form micelles in selective solvents. Also disclosed are particles, each of which has a shell and a core, and a diameter of about 1 to 1,000 nanometers, and methods of delivering agents or removing substances, e.g., undesirable substances, from a subject or environment, by using these particles.
摘要:
A molded article including a plastic layer and an outer film over the plastic layer forming a composite laminate with the plastic layer and a process for preparing same. The outer film has an inner surface adjacent and bonded to the plastic layer and an outer surface opposed to the inner surface. The molded article also includes a reinforcing material adhered to the inner surface of the outer film layer and preferably at least partly embedded in the inner surface of the outer film layer.
摘要:
Biodegradable blends including a first, polylactic acid-based polymer or copolymer, and a second polymer or copolymer including one or more polyesters, e.g., an aliphatic polyester or a polyester of one aliphatic C.sub.2 to C.sub.20 diacid or of a combination of two more different aliphatic C.sub.2 to C.sub.20 diacids, wherein the first and second polymers are present in a ratio of 9:1 to 1:9, are described.
摘要:
A biodegradable and hydrodegradable diblock copolymer includes a naturally-occurring poly(.beta.-alkanoate) component and a chemically synthesized polyester component formed by ring-opening polymerization. A method of forming the biodegradable and hydrodegradable diblock copolymer having a poly(.beta.-hydroxyalkanoate) component and a chemically synthesized polyester component includes exposing a naturally-occurring poly(.beta.-hydroxyalkanoate) to alcoholysis and then to a trialkyl metal to form a dialkyl metal poly(.beta.-hydroxyalkanoate) macroinitiator. The macroinitiator is then reacted with a lactone or lactide reactant to form the biodegradable and hydrodegradable diblock copolymer.
摘要:
The invention relates to new amphiphilic linear block copolymers of polysaccharides and polymers. The amphiphilic linear block copolymers do not form a true solution in water and are able to form micelles in selective solvents. Also disclosed are particles, each of which has a shell and a core, and a diameter of about 1 to 1,000 nanometers, and methods of delivering agents or removing substances, e.g., undesirable substances, from a subject or environment, by using these particles.
摘要:
A film and heated plastic blank are sized to fit over a mold cavity and a combination of said film and blank formed. The combination is positioned over the mold cavity and formed in said mold cavity into the shape of said mold cavity.
摘要:
This invention relates to high molecular weight bioresorbable copolymers constructed to be useful for specific applications in the biomedical arts. Also provided is a new cyclic carbonate monomer, and copolymers containing the new monomers.