高强高模PVA纤维的横纹结构

选取不同转化率下无乳化剂乳液聚合制得的聚乙烯醇(PVA)进行凝胶纺丝,经相同后处理工艺处理后,得到两种纤维,光学显微镜下观察到低转化率下制得的纤维有横纹,高转化率下的无横纹。采用纤维强伸仪、偏光显微镜、扫描电镜(SEM)、X射线衍射及差示扫描量热(DSC)对纤维力学性能、表面形貌和内部结构进行分析,结果表明,两种纤维都具有较高的力学性能,内部较致密,横纹纤维较无横纹纤维结晶度高,表面较光滑。理论推测横纹由拉伸过程中形成的柱晶结构引起。

Cross-Striation Structure of High Strength and High Modulus PVA Fiber

The poly(vinyl alcohol)(PVA),obtained by emulsifier-free emulsion polymerization of PVAc with different conversions,was spun via a gel-spinning method.Two kinds of fibers were obtained after the same post-treatment condition,one with cross-striation on the surface and the other not,observed by optical microscope.The,surfaces and structures of them were analyzed using fiber tensile tester,polarized microscope,scanning electron microscope(SEM),X-ray diffraction(XRD)and differential scanning calorimetry(DSC).R...