纺丝条件及纺丝液组成对丝素-丝胶蛋白同轴干纺纤维的影响

为了模仿家蚕的纺丝工艺及天然蚕丝的组成和皮芯结构,利用同轴干法纺丝技术制备了以再生丝素蛋白（RSF）为芯层、丝胶蛋白（SS）为皮层的RSF-SS纤维。研究了卷绕速率及芯层纺丝液中RSF质量分数对纤维形貌、2级结构及力学性能的影响。结果表明：复合纤维具有明显的皮芯结构;相对于RSF的质量分数,卷绕速率对纤维结构和性能的影...     

Synthesis of polytitanosiloxanes and their transformation to SiO2–TiO2 ceramic fibers

A one-pot synthesis of polytitanosiloxanes (PTS) and its transformation to SiO₂–TiO₂ ceramic fibers were investigated. PTS was prepared by the hydrolysis of tetraethoxysilane followed by the reaction with bis(2,4-pentanedionato)titanium diisopropoxide in methanol in 33–95 SiO₂ mol %. PTS was considered to be a ladder- or sheet-type polymer consisting of Si? O? Si and Si? O? Ti linkages as a main chain with pendant hydroxyl and 2,4-pentanedionato groups. SiO–TiO ceramic fibers were prepared by the pyrolysis of SiO₂–TiO₂ precursor fibers, which were prepared by the dry spinning of PTS followed by steam treatment. The tensile strength was 610 MPa for the SiO₂–TiO₂ fibers (SiO₂/TiO₂ = 20) after the pyrolysis at 700₀C. © 1994 John Wiley & Sons, Inc.