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Preparation of breathable superhydrophobic PU/SNPs hybrid nanowebs by electrospinning : 투습가능한 초소수성 폴리우레탄/실리카 나노입자 하이브리드 전기방사 나노웹 개발
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | 박정희 | - |
| dc.contributor.author | 김소화 | - |
| dc.date.accessioned | 2017-07-19T11:48:54Z | - |
| dc.date.available | 2017-07-19T11:48:54Z | - |
| dc.date.issued | 2014-08 | - |
| dc.identifier.other | 000000022163 | - |
| dc.identifier.uri | https://hdl.handle.net/10371/133811 | - |
| dc.description | 학위논문 (석사)-- 서울대학교 대학원 : 의류학과, 2014. 8. 박정희. | - |
| dc.description.abstract | Non-fluorinated polyurethane (PU)/SiO2-nanoparticles (SNPs) composite nanowebs with superhydrophobic and breathable properties were prepared by electrospinning, using n-dodecyltrimethoxysilane (DTMS) as water repellent chemicals. The fiber morphology was examined by field emission scanning electron microscopy. The average fiber diameter was about 600-800nm with 1wt-6wt % SNPs, and they were observed spread on all of fiber surfaces.
The combination of the hierarchical surface roughness of PU/ SNPs nanowebs yielded a stable superhydophobicity with water contact angles as high as 159° and shedding angle as low as 5° by electrospinning and chemical vapor deposition (CVD)-coating process. The water contact angle (WCA) of pure PU nanowebs and PU/SNPs nanowebs increased from 131° to 151°, which could be attributed to the increasing size of the fiber diameter leading to increased roughness of the membranes. Besides, adding SNPs had positive effects on porosity of nanowebs, and thus of can be regarded as super breathable nanowebs. The water vapor transmission rate test showed that the moisture permeability of PU/SNPs was the highest. After through the treatment of DTMS hydrophobic surface-modification, the air permeability and water vapor transmission of the PU-SNPs-CVD nanowebs decreased comparing with the PU-SNPs nanowebs. | - |
| dc.description.tableofcontents | CONTENTS
Chapter 1. Introduction.........................10 1. Purpose..................................... 10 2. Theoretical background.......................12 2.1. Superhydrophobicity........................13 2.2. Approaches to preparing surface structures 13 2.3. Polyurethane...............................24 2.4. Ormosils...................................26 Chapter 2. Experimental.........................29 1. Materials....................................29 2. Web preparetion..............................29 2.1. Electrospinning process....................32 2.2. Preparation of PU nanoweb..................34 2.3. Preparation of PU-SNPs nanoweb.............34 2.4. Preparation of PU-SNPs-CVD nanoweb.........35 3. Characterization.............................38 3.1. Observation of surface morphology..........38 3.2. Mechanical property measurement............38 3.3. FT-IR analysis.............................39 3.4. Evaluation of surface wettability property.40 3.4.1. Static contact angle.....................39 3.4.2. Shedding angle...........................39 3.5. Transport property measurement.............41 3.5.1. Air permeability.........................41 3.5.2. Water vapor transmission.................41 Chapter 3. Results and Discussion...............43 1. Surface morphology...........................43 1.1.Preparation of PU nanoweb...................43 1.2.Concentration of PU in the PU/SNPs solution.46 1.3.The structure of PU/SNPs nanofibers with TEOS/acetic acid solution...................................50 1.4.PU-SNPs nanoweb.............................51 1.5.PU-SNPs-CVD nanoweb.........................54 2. Mechanical property..........................55 3. Surface chemical property....................59 4. Surface wettability..........................63 4.1. Static contact angle.......................63 4.2. Shedding angle.............................65 5. Transport property...........................67 5.1. Air permeability...........................67 5.2. Water vapor transmission...................70 Chapter 4. Conclusion...........................73 1.Conclusion....................................73 References......................................75 | - |
| dc.format | application/pdf | - |
| dc.format.extent | 2569131 bytes | - |
| dc.format.medium | application/pdf | - |
| dc.language.iso | en | - |
| dc.publisher | 서울대학교 대학원 | - |
| dc.subject | Superhydrophobicity | - |
| dc.subject | Breathability | - |
| dc.subject | Non-flouro materials | - |
| dc.subject | Electrospinning | - |
| dc.subject.ddc | 646 | - |
| dc.title | Preparation of breathable superhydrophobic PU/SNPs hybrid nanowebs by electrospinning | - |
| dc.title.alternative | 투습가능한 초소수성 폴리우레탄/실리카 나노입자 하이브리드 전기방사 나노웹 개발 | - |
| dc.type | Thesis | - |
| dc.contributor.AlternativeAuthor | JIN SHAOHUA | - |
| dc.description.degree | Master | - |
| dc.citation.pages | 74 | - |
| dc.contributor.affiliation | 생활과학대학 의류학과 | - |
| dc.date.awarded | 2014-08 | - |
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