复合凝固剂对聚酰亚胺沉析纤维成形的影响
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摘要
采用沉析法制备聚酰亚胺沉析纤维,以乙醇-NMP为主要凝固剂,向其中加入不同含量的水制备成复合凝固剂,通过研究聚酰亚胺与乙醇、水凝固机理的不同,改善沉析纤维的沉析工艺;通过调控复合凝固剂的组成,探究其对沉析纤维形貌、保水值、比表面积等性能的影响。结果表明:利用沉析法制备聚酰亚胺沉析纤维,以乙醇-NMP作主要凝固剂,凝固速度慢,成形更加可控,且减少浪费和污染;以水作为第三组分加入到凝固剂中配置复合凝固剂,可赋予沉析纤维薄膜状形貌,增加沉析纤维间以及沉析纤维与短切纤维间的接触面积,提高成纸时的纸张性能;当复合凝固剂中水的含量为4%时,沉析纤维性能最佳,保水值达32.6 g·g~(-1),比表面积达55.4 m~2·g~(-1)。
Polyimide(PI) fibrids were prepared by precipitation, and ethanol-NMP was used as the main coagulant, and different content of water was added to prepare the compound coagulant. The solidification mechanism between polyimide and ethanol or water was studied. The effects of composition of the compound coagulant on the morphologies, water retention values and specific surface areas were investigated. The results showed that the solidification rate was slow, the forming was more controllable, and the waste and pollution were reduced when using ethanol-NMP as the main coagulant. As a third component added to the coagulant, the water can impart a film-like morphology to the fibrid, it will increase the contact areas between the fibrids and between the fibrids and the short fibers, which will improve the paper's properties. When the content of water is 4%, the performance of the fibrids were the best, the water retention value was 32.6 g·g~(-1), and the specific surface area is 55.4 m~2·g~(-1).
Polyimide(PI) fibrids were prepared by precipitation, and ethanol-NMP was used as the main coagulant, and different content of water was added to prepare the compound coagulant. The solidification mechanism between polyimide and ethanol or water was studied. The effects of composition of the compound coagulant on the morphologies, water retention values and specific surface areas were investigated. The results showed that the solidification rate was slow, the forming was more controllable, and the waste and pollution were reduced when using ethanol-NMP as the main coagulant. As a third component added to the coagulant, the water can impart a film-like morphology to the fibrid, it will increase the contact areas between the fibrids and between the fibrids and the short fibers, which will improve the paper's properties. When the content of water is 4%, the performance of the fibrids were the best, the water retention value was 32.6 g·g~(-1), and the specific surface area is 55.4 m~2·g~(-1).
引文
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[4]任娟,徐山青,刘其霞,等.沉析纤维的性能与应用[J].纺织导报,2014(10):68-70.
[5]张素风,张美娟,张斌,等.PET沉析纤维表面形貌及热性能研究[J].合成纤维,2017,46(4):25-28.
[6]何素文,陈国强,钟洲,等.超声波分散对芳纶1313纸匀度与性能的影响[J].纸和造纸,2015,34(11):38-42.
[7]江明,张美云,陆赵情,等.对位芳纶沉析纤维性能研究[J].功能材料,2014,45(8):8075-8078.
[8]Xie F,Qin P,Zhuo L,et al.Novel aramid paper-based materials with enhanced thermal conductivity via ZnO nanowire decoration on aramid fibers[J].Journal of Materials Science:Materials in Electronics,2018,29(14):12161-12168.
[9]王盼,林德苗,陶琳.间位聚芳酰胺纤维纸热压过程浅析[J].纸和造纸,2017(3):36-40.
[10]张玉梅.聚酰亚胺沉析纤维的制备及成形机理[D].上海:东华大学,2013.
[11]严致远.聚酰亚胺纤维纸的制备及其性能研究[D].广州:华南理工大学,2015.
[12]徐强,陆赵情,王志杰.聚酰亚胺纤维及其在造纸工业中的应用[J].纸和造纸,2012,31(10):61-65.
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