Abstract:
The present invention provides a method for preparing biodegradable porous polymer scaffolds for tissue engineering, comprising: a) fabricating a polymer sample from a polymer solution containing at least one biodegradable polymer and an effervescent mixture; b) effervescing the polymer sample in the presence of an effervescent medium such as an aqueous alcohol solution; and c) drying. The method for preparing biodegradable polymer scaffolds of the present invention has the advantages that the process is simple, that pore size can be easily controlled, that the problem caused by the secretion and existence of the toxic substance can be avoid by using a material harmless to human body, and that high efficiency can be achieved. In addition, biodegradable porous polymer scaffolds prepared by above method have the advantages that high porosity can be achieved and an open cell structure in which pores are interconnected is obtained.
Abstract:
Biodegradable and biocompatible porous scaffolds characterized by a substantially continuous polymer phase, having a highly interconnected bimodal distribution of open pore sizes with rounded large pores of about 50 to about 500 microns in diameter and rounded small pores less than 20 microns in diameter, wherein the small pores are aligned in an orderly linear fashion within the walls of the large pores. Methods of preparing polymeric tissue scaffolds are also disclosed.
Abstract:
A method for preserving the porosity of porous materials is disclosed. In this method, the porous material is subjected to elevated temperature and vacuum conditions to thereby produce a dimensionally-stable, non-collapsible porous material.
Abstract:
The disclosed invention relates to films from a novel latex mixture which are non-porous, microcellular and opaque in the absence of an opacifying agent. The preparation of the films of the disclosed invention comprises providing control techniques for entrapping a sufficient amount of a liquid non-solvent for the polymer in the polymer matrix of a latex after the continuous phase removal, so that upon evaporation of the non-solvent from a coalesced and tack-free polymer matrix, a resulting opaque and continuous, non-porous film is produced which will have minute, discrete and substantially closed voids and which is opaque in the absence of an opacifying agent such as pigment.The disclosed invention also relates to opaque films with enhanced optical properties produced by the inclusion of pigments, fluorescent materials and optical brighteners in the opaque films in such a manner as to maximize their effectiveness therein.
Abstract:
The present invention provides a method for preparing biodegradable porous polymer scaffolds for tissue engineering, comprising:a) fabricating a polymer sample from a polymer solution containing at least one biodegradable polymer and an effervescent mixture;b) effervescing the polymer sample in the presence of an effervescent medium such as an aqueous alcohol solution; andc) drying.The method for preparing biodegradable polymer scaffolds of the present invention has the advantages that the process is simple, that pore size can be easily controlled, that the problem caused by the secretion and existence of the toxic substance can be avoid by using a material harmless to human body, and that high efficiency can be achieved. In addition, biodegradable porous polymer scaffolds prepared by above method have the advantages that high porosity can be achieved and an open cell structure in which pores are interconnected is obtained.
Abstract:
A porous material comprising vapor grown carbon fiber in an amount of 10 to 90 mass %, fiber filaments of the carbon fiber forming a three-dimensional network and having a diameter of 1 to 1,000 nm, an aspect ratio of 5 to 15,000, a specific surface area (by BET method) of 2 to 2,000 m 2 /g, and the ratio of the intensity of the peak at 1,360 cm -1 in a Raman scattering spectrum of the carbon fiber to that of the peak at 1,580 cm -1 in the spectrum(I 1360 /I 1580 ) is 0.1 to 2.0, wherein the porosity of the porous material (V/V 0 ) is 0.50 to 0.99 and a specific surface area is 5 to 1,000 m 2 /g; and a production method and use thereof. The vapor grown carbon fiber impregnated in the porous material of the present invention does not contain aggregates and a three-dimensional network is formed between the fiber filaments, wherein length of each of the fiber filaments is maintained.; Therefore, the vapor grown carbon fiber enables to readily produce a composite material (porous material), in which even a small amount of addition of vapor grown carbon fiber can exhibit sufficient effect.
Abstract translation:包括蒸汽的多孔材料在按质量计的10至90%的量的生长的碳纤维中,碳纤维形成的三维网络和具有直径为1至1,000nm的纤维丝,在5至15,000的纵横比,特定的 的2至2,000米2 /克的表面积(通过BET法),和该峰的强度中的1360厘米比率-1中的碳纤维的峰的拉曼散射光谱的那样在1580厘米-1在 频谱(I 1360 / I 1580)为0.1〜2.0,worin多孔材料的孔隙率(V / V 0)为0.50〜0.99和的比表面积是5〜1000米2 /克; 及其制造方法及其用途。 在一个三维网络本发明不包含聚集体的多孔材料和浸渍的气相生长碳纤维在纤维丝之间形成,每个所述纤维丝的长度worin维持。 因此,气相生长碳纤维使容易地制造复合材料(多孔材料),其中甚至除了气相生长碳纤维的少量可以表现出充分的效果。
Abstract:
The present invention relates to porous beads and to methods of production thereof, in particular to a method of producing hydrophilic polymeric beads by freeze-drying a droplet containing a polymeric material in a continuous phase of an oil-in-water (O/W) emulsion.
Abstract:
[PROBLEMS] To provide a thin film-shaped porous bioabsorbable material that is a dense structure in which the pore size average is small and the pore size is uniform and which further has a large maximum stress, in particular, a porous bioabsorbable material extremely useful as an adhesion preventing material. [MEANS FOR SOLVING PROBLEMS] A porous bioabsorbable material characterized by being formed of a porosified bioabsorbable polymer which is obtained in a manner that a bioabsorbable polymer is gelled with a good solvent and a poor solvent, compatible with each other, for the bioabsorbable polymer and the gelled bioabsorbable polymer is subjected to freeze-drying to be porosified; and a method of producing the porous bioabsorbable material, the method being characterized in that a bioabsorbable polymer is gelled with a mixed solvent composed of a good solvent and a poor solvent, compatible with each other, for the bioabsorbable polymer and the gelled bioabsorbable polymer is subjected to freeze-drying to be porosified.