Ultrafine porous fibers electrospun from cellulose triacetate |
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| Affiliation: | 1. Functional Materials Research Center, Korea Institute of Energy Research, Daejeon 305-343, South Korea;2. Research Institute of Advanced Materials, Chungnam National University, Daejeon 305-764, South Korea;3. Department of Textile Engineering, Inha University, Incheon 402-751, South Korea;4. Department of Textile Engineering, Chungnam National University, Daejeon 305-764, South Korea;1. Research Unit for Clean Technology, Indonesian Institute of Sciences (LIPI), Jalan Cisitu Sangkuriang, Bandung 40135, Indonesia;2. Research Center for Physic, Puspitek Serpong, Tangerang 15310, Indonesia;1. Silk Institute, College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China;2. Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China;3. Department of Materials Engineering, University of British Columbia, Vancouver, Canada |
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| Abstract: | Ultrafine porous cellulose triacetate (CTA) fibers were prepared by electrospinning with methylene chloride (MC) and a mixed solvent of MC/ethanol (EtOH) and their intra- and inter-fiber pore structures was investigated. Ultrafine porous CTA fibers electrospun with MC had isolated circular shape pores with a narrow size distribution in the range of 50–100 nm. In the case of ultrafine CTA fibers electrospun with MC/EtOH (90 / 10 v/v), they had interconnected larger pores in the range of 200–500 nm. These porous structures were induced by phase separation resulting from the rapid evaporation of solvent during the electrospinning process. However, non-porous corrugated fibers were obtained from MC/EtOH (85 / 15 v/v) and MC/EtOH (80 / 20 v/v) due to their lower vapor pressure. The pore sizes in ultrafine CTA fibers electrospun with MC showed a bimodal distribution centered at ∼17 and ∼64 nm. CTA fibers electrospun with MC/EtOH (90 / 10 v/v) showed the greatest porosity due to their larger intra-fiber pores and fiber diameter. |
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