High-Strength and High-Toughness Polyimide Nanofibers: Synthesis and Characterization
High-Strength and High-Toughness Polyimide Nanofibers: Synthesis and Characterization
复制标题
高强高韧聚酰亚胺纳米纤维的合成与表征
DOI：
10.1002/app.31523
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发表时间：
2010-05-05
影响因子：
3
通讯作者：
Hou, Haoqing
中科院分区：
文献类型：
--
作者：
Cheng, Chuyun;Chen, Juan;Hou, Haoqing
以聚酰亚胺6 F-PI为原料，采用静电纺丝法制备了高强高韧纳米纤维。6 F-PI具有由3，3 '，4，4'-联苯-四羧酸二酐和2，2-双[4-（4-氨基苯氧基）苯基]-六氟丙烷残基组成的主链。在旋转盘的边缘上以对齐的纤维片的形式收集电纺6 F-PI前体纳米纤维。加热过程将前体纤维片材转化为6 F-PI纤维片材。使用凝胶渗透色谱法和奥斯特瓦尔德粘度计测定6 F-PI前体的分子量和分子量分布，即，6 F-聚酰胺酸。采用扫描电子显微镜、红外光谱、X射线散射、拉伸试验、动态力学分析、热重分析和差示扫描量热法对6 F-PI复合材料的表面形貌、热稳定性和力学性能进行了表征。实验结果表明，纳米纤维在纤维直径为50 ~ 300 nm的片材中排列良好。玻璃化片材在450 ℃以上是稳定的，玻璃化转变温度为265.2 ℃。单轴拉伸测试表明，6 F-PI纳米纤维片材具有优越的上级力学性能。6 F-PI片材的极限拉伸强度、模量、韧性和断裂伸长率分别为308 +/-14 MPa、2.08 +/-0.25 GPa、365 +/-20 MPa和202 +/-7%。预计具有如此高韧性和高极限拉伸强度的静电纺丝PI纳米纤维可以在例如高性能纺织品和复合材料中找到应用。(C)2010 Wiley Periodicals，Inc. J Appl Polym Sci 116：1581-1586，2010
High-strength and high-toughness nanofibers were made from polyimide 6F-PI through electrospinning. The 6F-PI had a backbone made up with 3,3',4, 4'-biphenyl-tetracarboxylic dianhydride and 2,2-bis[4-(4-aminophenoxy)phenyl]-hexafluoro-propane residues. Electrospun 6F-PI precursor nanofibers were collected in the form of aligned fiber sheet on the rim of a rotating disc. Heating process converted the precursor fiber sheets to 6F-PI nanofiber sheets. Gel permeation chromatography and Ostwald Viscometer were used to determine the molecular weight and the molecular weight distribution of the 6F-PI precursor, i.e., the 6F-polyamic acid. Scanning electron microscopy, infrared spectroscopy, X-ray scattering, tensile testing, dynamic mechanical analysis, thermogravimetric analysis, and differential scanning calorimetry were employed to characterize the surface morphology, thermal stability, and mechanical properties of the 6F-PI nanofiber sheets. Experimental results show that the nanofibers were well aligned in the sheets with fiber diameters ranging from 50 to 300 nm. The nanofiber sheets were stable to over 450 degrees C, with a glass transition at 265.2 degrees C. The uniaxial tension test showed that the 6F-PI nanofiber sheets had superior mechanical properties. The ultimate tensile strength, modulus, toughness, and elongation to break of the 6F-PI nanofiber sheets are respectively, 308 +/- 14 MPa, 2.08 +/- 0.25 GPa, 365 +/- 20 MPa, and 202 +/- 7%. It is expected that electrospun PI nanofibers with such high tougluless and high ultimate tensile strength can find applications in high-performance textiles and composites, for example. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 116: 1581-1586, 2010