张力对聚丙烯腈纤维不熔化过程中氧化反应的影响

通过连续的不熔化实验,在不同温度段对聚丙烯腈纤维施加不同的张力,得到一系列不熔化纤维。借助差示扫描量热法(DSC)、元素分析(EA)、场发射扫描电镜(FESEM)等表征手段,研究张力在不熔化过程中对氧化反应的影响。结果表明,在175~218℃,随着张力的增大,纤维内氧含量减少,氧含量梯度(氧梯度)变化不大;在226~232℃,氧含量随张力增大先增多后减少,张力较大使得更多氧参与反应,纤维皮部与芯部氧含量差异增大,氧梯度较大;在238~270℃,随张力增大纤维内氧含量增多氧梯度增大。

The effects of tension on oxidization of polyacrylonitrile fibers during stabilization

In this work, various tensions were applied on PAN precursor fibers in different stages of continuous stabilization, the differential scanning calorimetry （DSC）, elemental analysis（EA）, field emission scanning electron microscope （FESEM） and other analyses were used for clarifying the effects of tension on oxidization. The results showed that, when stabilization fibers were treated at 175-218 ℃, the oxygen content decrease with the increase of tension, but the gradient of oxygen content has no obvious change. At 226-232 ℃, the oxygen content first increase then decrease with tension increasing.When the tension is high enough, more oxygen participated in oxidation which make the gradient of oxygen content become higher. For the treated fibers up to 238-270 ℃, the oxygen content and gradient of it decrease with tension increasing.