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采用聚乙二醇-600(PEG-600)改性丙烯腈-衣康酸二元共聚的聚丙烯腈(PAN)纺丝液,并通过湿纺制备出初生纤维。通过接触角测试、光学显微镜、扫描电镜(SEM)、X-射线衍射(XRD)研究了PEG-600用量对PAN树脂亲水性、初生纤维横截面形貌、晶态结构的影响。结果表明,PEG-600用量为0.1%时,与未加PEG-600的样品相比,PAN树脂的亲水性降低,初生纤维的横截面仍为非圆形,皮芯结构增强,结晶度降低,晶粒尺寸变大;PEG-600用量为0.3%～0.5%时,与未添加PEG-600的样品相比,PAN树脂的亲水性较未加PEG-600的样品的亲水性增加,初生纤维的横截面为圆形,皮芯结构减弱,结晶度降低但比PEG-600用量为0.1%样品的高,晶粒尺寸与PEG-600用量为0.1%样品的相同。
Poly (acrylonitrile-itaconic acid) bicomponent polyacrylonitrile (PAN) spinning solution modified with polyethylene glycol-600 (PEG-600) was prepared and the nascent fibers were prepared by wet spinning. The effects of the amount of PEG-600 on the hydrophilicity of PAN resin, the morphology of the cross-section of the nascent fiber and the crystalline structure were studied by means of contact angle measurement, optical microscope, scanning electron microscope (SEM) and X-ray diffraction (XRD) The results showed that when the dosage of PEG-600 was 0.1%, the hydrophilicity of PAN resin decreased compared with that of non-PEG-600, the cross section of nascent fiber was still non-circular, the structure of core and core increased and the crystallinity decreased , The grain size becomes larger. When the content of PEG-600 is between 0.3% and 0.5%, the hydrophilicity of PAN resin is higher than that of non-PEG-600, The cross-section of primary fibers was round, the core structure was weakened, the crystallinity was lower but higher than that of 0.1% PEG-600, and the grain size was the same as that of 0.1% PEG-600.