Preparation of Polyurethane Nanofibers by Emulsion Electrospinning

乳液静电纺丝制备聚氨酯纳米纤维

• 批准号: 23655209
• 负责人: AOKI Yuji
• 金额: $ 2.58万
• 依托单位: Yamagata University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23655209/
• 关键词: エレクトロスピニング; ポリウレタン; コア・シェル構造; ナノファイバー; 高強度・高弾性; コアシェル構造

In an electrospinning, an organic solvent is usually used to dissolve polymer. From the viewpoint of environment a new process without organic solvent is required. We investigated the novel method of electrospinning by using an emulsion of polyurethane pre-polymer / poly (vinyl alcohol) aqueous solution without using an organic solvent. We obtained PU particles about 2 micrometer in diameter from PVA-aq / PU blend, in which PVA was removed from the electrospun mat.By incorporating cross-linking agent to the emulsion, we observed large aggregates of the PU particles in emulsion. We obtained a thick fiber (about 260 micrometer in diameter) of PU by using the emulsion with cross-linking agent. The cross-linking reaction generated the urea bond on the surface of PU particles. We considered that the urea bond was more stronger than aggregating that of interaction between the PU particles. This aggregates were extended by electrospinning process and eventually led to the fiber.

在静电纺丝中，通常使用有机溶剂来溶解聚合物。从环境的角度来看，需要一种无有机溶剂的新方法。我们研究了一种新的方法，通过使用聚氨酯预聚物/聚（乙烯醇）水溶液的乳液，而不使用有机溶剂的静电纺丝。我们从PVA-aq / PU共混物中获得了直径约2 μ m的PU颗粒，其中PVA从静电纺丝垫中除去。通过将交联剂引入乳液中，我们观察到乳液中PU颗粒的大聚集体。用该乳液与交联剂共混，制得了直径约260 μ m的聚氨酯粗纤维。交联反应在PU粒子表面生成了脲键。我们认为聚氨酯颗粒之间的相互作用是脲键作用而不是聚集作用。这种聚集体通过静电纺丝过程延伸并最终导致纤维。