摘要:
New polymer blends are provided. These blends comprise a first polymer, a second polymer and thermoplastic starch, the thermoplastic starch being at least partially encapsulated in the second polymer. The polymer blends may be shaped into articles, for example by extrusion or injection molding.
摘要:
A dynamically vulcanized alloy containing an elastomer and a thermoplastic resin is prepared by a process wherein supercritical fluid is injected into the thermoplastic elastomeric material as the material is mixed in an extruder. The material is mixed under conditions such that the thermoplastic elastomeric material is dynamically vulcanized wherein the elastomer forms a discontinuous dispersed of small particles in a continuous phase of the thermoplastic resin. The DVA material may then be directly formed into film or sheets by the use of at least one set of rolls located adjacent to the extruder outlet.
摘要:
The present invention relates to a method for making a porous material, comprising the steps of (I) melt-blending two or more non-miscible polymers to obtain a co-continuous melt, (II) solidifying the melt to obtain a solid mass consisting of two co-continuous polymer phases, (III) selectively extracting one of the co-continuous phases thereby creating within the solid mass an essentially continuous pore network having an internal surface, (iv) replicating the internal surface of the pore network within the solid mass by coating the internal surface with successive layers of materials, and (v) selectively extracting the solid mass without extracting the layers of materials, to thereby yield the product porous material, formed of the layers of materials, having a void fraction higher than about 75%, and mainly consisting of essentially fully interconnected sheath-like non-spherical pores and essentially non-fibrous walls.
摘要:
The present invention relates to a highly controlled method of preparation of a microporous biodegradable polymeric article. Firstly, at least one biodegradable polymer A, one polymer B, biodegradable or not, partially or totally immiscible with A, and a compatibilizer C for A and B are selected. Secondly, the selected polymers are melt-blended, thereby preparing a polymer blend, wherein said polymers A and B have an essentially continuous morphology. Thirdly, after cooling, polymer B and compatibilizer C are selectively extracted from the polymer blend by dissolution in a solvent that is a non-solvent of polymer A. The resulting polymeric article has an essentially continuous porosity with a void volume between 10 and 90% and a unimodal diameter distribution set to a predefined unimodal peak location. It can be used in tissue engineering, for controlled release applications or as an implantable medical device.
摘要:
Disclosed herein is a composition of matter comprising a blend of discontinuous thermoplastic starch domains in a synthetic polymer, said composition of matter being characterized by an average diameter of thermoplastic starch domains of about 0.2 to about 1.5 microns. Also disclosed are compositions of matter comprising a blend of discontinuous thermoplastic starch domains in a synthetic polymer and being characterized by finished articles having key mechanical properties which are essentially maintained or in some cases improved over pure synthetic polymers. In yet another aspect, the present invention provides a method for making the material of the present invention. In a related aspect, the present invention provides the novel materials issued from the method of making the material. In other aspects, the present invention provides novel finished article compositions in the form of films or molded articles.