Physico-Chemical Properties of a Water-Insoluble Silk Fibroin Film

The conventional silk fibroin(SF)films obtained by casting from SF aqueous solution are amorphous,and easily dissolved in water.This defect limits the practical use of SF films in biomedical field.A new water-insoluble silk fibroin film(an SF-FA film)could be simply prepared by casting from SF formic acid solution.The physical properties and moisture permeability of SF-FA films were examined.The results show that the SF-FA film swollen in water exhibits outstanding pliability.The weight loss of SF-FA films ...     

聚乙二醇-丝素共混膜物理性能的研究

不同相对分子质量的聚乙二醇(PEG)以不同比例混入丝素可形成共混丝素膜，并具有良好的拉伸性、透水、透；气、透光性和一定的生物降解与溶解性。实验结果表明：虽PEG和丝素的可混合性稍差，但在一定的透水、透汽性和较好的柔韧性前提下，可达到创面膜的基本要求。     

具有核-壳结构的聚吡咯纳米复合棒的制备与表征

以纤维状偶氮染料GR为模板,在氧化剂过硫酸铵的作用下,吡咯单体原位聚合,制备偶氮功能基团掺杂的导电聚吡咯(PPy)纳米材料.试验结果表明:合成的聚吡咯为实心的棒状复合材料,形态结构规整,直径约为200 nm,长度为几微米,并具有核-壳结构,其内核为偶氮染料GR(直径约为60 nm),外层由粒状聚吡咯构成,表面凹凸不平.聚吡咯纳米复合棒表现出良好的热稳定性,其电导率为10-3 S/cm数量级.在交变电场中,随着外加频率的增加,材料的相对介电常数表现出明显的下降趋势.X射线衍射(XRD)测试表明,聚吡咯纳米棒为非晶态结构材料.     

丝素改性聚氨酯膜的物理性质及其细胞相容性

用丝素蛋白或丝素肽表面改性的聚氨酯膜表现出良好的柔韧性，它能够克服丝素膜刚而脆的弱点；由水分散型聚氨酯制备的改性膜的透气性高于疏水性聚氨酯膜；细胞培养实验结果表明：经丝素蛋白或丝素肽改性后，聚氨酯膜的生物相容性明显提高且处理效果是稳定的。     

Silk Fibroin-modified Poly（butadiene） urethane Films and Their Effects on Fibroblast Viability

Surface-modified poly（butadiene）urethane （PBTU） films with silk fibroin （SF） were prepared by simple chemical method under the normal temperature. The physical properties and biological behaviour of the SF-modified PBTU film were evaluated. The results showed that the SF-modified PBTU films kept the tenacity and pliability very well, and could overcome rigid and brittle weaks of silk fibroin films. The morphology of SF in the PBTU film was dendritic aggregations, and the water-contact angle measurement indicated that the surface hydrophilicity of modified films was apparently enhanced. The biocompatibility of PBTU films was improved due to the change of surface components. The degree of platelet adhesion and the cell viability of rat embryo dermal fibroblasts seeded on PBTU films, SF films, and SF-modified PBTU films were measured by counting platelets before and after they contacted the films and MTT assay, respectively. The results indicated that platelet adhesion resistance and cell viability on the modified film were greatly superior to those on the PBTU film and the compound interface had good stability in the air.     

聚（N—甲基）苯胺作为蓄电池阴极活性材料的电化学性能研究

聚（Ｎ－甲基）苯胺作为一种新的二次电池阴极材料在酸性溶液中有很高的稳定性,由聚（Ｎ－甲基）苯胺膜电极Ｚｎ片,１．０ｍｏｌ／Ｌ,ＺｎＣｌ２水溶液（ｐＨ＝２．０１）构成的电池,其开路电压的１．３１Ｖ,在恒电流放电速率为０．１５ｍＡ／ｃｍ＾２（放电电压为０．９Ｖ,聚合物重量为２．０ｍｇ／ｃｍ＾２）聚（Ｎ－甲基）苯胺的容量密度和能量密度分别为９７．５Ａｈ／ｋｇ,９４．６Ｗｈ／ｋｇ,在上述充放电电流密度下,     

Surface Modification of Anionic Polyurethane with Silk Fibroin Peptide and Its Effects on the Culture of Fibroblasts

The surface modification of the anionicpolyurethane(APU) film was carried out by immersing it insilk fibroin peptide(SFP) solution for 12 h and then treatingwith low temperature plasma glow discharge. The physicalproperties and moisture permeability of modified films wereexamined. The results showed that SFP-modified APU filmshad better moisture permeability than oleophilicpolyurethane, as well as modified APU films kept goodflexibility. Modified APU films could overcome rigid andbrittle weaks of silk fibroin films. The morphology of SFPon the APU film was corpuscular aggregations. The water-contact angle measurement indicated that the change ofhydrophilicity and the element chemical analysis suggestedthat the SFP-modified film surface was enriched withnitrogen atoms. The biocompatibility of APU films may beimproved due to the change of surface compooents. Cellviability and proliferation of rat embryo dermal fibroblastsseeded on control films, APU films and SFP-modified APUfilms were evaluated by MTT assay and viable cell counts,respectively. The results indicated that the APU filmmodified by SFP protein showed the proliferation offibroblasts on the film, and that the compound interface hadgood stability in the air. Results also showed thatpresoaking treatment for APU films was effective toaccomplish the goal of surface modification.