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首页> 外文期刊>Journal of Applied Polymer Science >Fabrication and Characterization of In Situ Synthesized Iron Oxide-Modified Polyimide Nanoweb by Needleless Electrospinning
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Fabrication and Characterization of In Situ Synthesized Iron Oxide-Modified Polyimide Nanoweb by Needleless Electrospinning

机译：无针电纺原位合成氧化铁修饰的聚酰亚胺纳米纤维网的制备与表征

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A series of poly(amic acid) (PAA) solutions were prepared by sol-gel condensation of 4,4'-oxydianiline (ODA) and 4,4'- oxydiphthalic anhydride (ODPA), containing various wt % (5, 10, 15) of an iron oxide precursor, that is, tris(acetylacetonato)iron(III) complex. The resulting PAA solutions were electrospun at 78 kV and collected as webs of nonwoven nanofibers of diameter ~60-70 nm and subsequently converted to iron oxide-modified polyimide (PI) nanofibers by slow thermal imidization. Aminopropyl triethoxysilane (APTES) and tetraethoxyorthosilicate (TEOS) were used as coupling agent and silica precursor, respectively, to enhance the compatibility between organic polymer matrix and inorganic moieties. SEM images reveal smooth and defect-free surface morphologies of the nanofibers. Superparamagnetic properties of the nanofibers were revealed by vibrating sample magnetometer (VSM). FT-infrared spectroscopy (IR), powder XRD, thermogravimetric analysis, and differential scanning calorimetry were employed to systematically characterize material structural properties, thermal stabilities, etc. Nanowebs showed excellent thermal stability around 446℃, with a glass transition temperature around 270℃. The above study demonstrates a good example for fabrication of highly thermally stable bead-free nanofiber webs by needleless electrospinning.
机译：通过4,4'-氧二苯胺（ODA）和4,4'-氧二邻苯二甲酸酐（ODPA）的溶胶-凝胶缩合制备一系列的聚（酰胺酸）（PAA）溶液，其中含有不同的wt％（5，10， 15）是氧化铁前体，即三（乙酰丙酮基）铁（III）配合物。将所得的PAA溶液在78 kV下进行电纺，然后收集成直径约60-70 nm的非织造纳米纤维网，然后通过缓慢的热酰亚胺化将其转变为氧化铁改性的聚酰亚胺（PI）纳米纤维。氨基丙基三乙氧基硅烷（APTES）和四乙氧基原硅酸酯（TEOS）分别用作偶联剂和二氧化硅前体，以增强有机聚合物基体与无机部分之间的相容性。 SEM图像揭示了纳米纤维的光滑且无缺陷的表面形态。通过振动样品磁力计（VSM）揭示了纳米纤维的超顺磁性。傅立叶变换红外光谱（IR），粉末XRD，热重分析和差示扫描量热法系统地表征了材料的结构性能，热稳定性等。纳米纤维网在446℃左右具有出色的热稳定性，玻璃化温度在270℃左右。上述研究证明了通过无针静电纺丝制造高度热稳定的无珠纳米纤维网的一个很好的例子。

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