聚酯/棕榈基多孔碳纤维杂化膜的结晶和力学性能

为提高静电纺丝聚酯纤维膜的力学性能,根据多孔碳纤维的高强度和高模量特性,在聚对苯二甲酸乙二醇酯(PET)溶液中添加自制棕榈基多孔碳纤维(PACF),制得PET/PACF杂化纤维膜,并研究了PACF含量对杂化纤维膜形貌、结晶行为和力学性能的影响。结果表明:添加PACF后,纤维牵伸效果明显改善,类竹节状纤维消失,纤维间黏连减少,直径更均匀;随PACF含量的增加,杂化纤维膜的玻璃化温度较纯PET提高约10℃,结晶度约提高6.7%,证明PACF的加入改善了电场对射流的牵伸效果,使得取向度提高;结晶温度提高约13.7℃,说明PACF异相成核作用促进了纤维膜的结晶。随取向度的提高,当PACF含量为2.5%时,纤维膜断裂强度达4.22 MPa,较纯PET静电纺膜提高了366.3%。

Crystallization behavior and mechanical properties of electrospun polyester/palm fiber-based activated carbon composite fibrous membranes

In order to enhance the mechanical properties of electrospun polyester( PET) membranes, the PET/palm fiber-based activated carbon fiber ( PET/PACF) composite fibrous membranes were prepared by adding PACF in PET solution, and electrospinning. The effect of the content of PACF on the morphology, crystallization behavior and mechanical properties of the PET/PACF composite fibrous membrane were studied. The results show that the addition of PACF obviously improves the drafting effect of fiber, so that the node-like fiber eliminates, the adhesion between fibers reduces and the fiber diameter becomes more uniform. The glass transition temperature and crystallinity are increased by 10 ℃ and 6. 7% along with the PACF content increasing, respectively. It is indicated that PACF can enhance the drawing effect of the electric field to the jet flow to improves the orientation degree. The crystal temperature increases by 13 . 7℃, showing that the heterogeneous nucleation effect of PACF promotes the crystallization of fibrous membrane. Along with the increasing of the orientation degree, when the PACF content is 2. 5%, the tensile strength of the PET/PACF membranes reaches 4. 22 MPa, increasing by 366. 3% compared with pure electrospun PET membrane.