| Author: | Chan, Shuk Ying |
| Title: | Flame retardant finishing based on novel boron polymers |
| Advisors: | Fei, Bin (ITC) Xin, John H. (ITC) |
| Degree: | M.Phil. |
| Year: | 2018 |
| Subject: | Hong Kong Polytechnic University -- Dissertations Cotton finishing Fireproofing agents Fireproofing of fabrics |
| Department: | Institute of Textiles and Clothing |
| Pages: | xxi, 148 pages : color illustrations |
| Language: | English |
| Abstract: | Statistics about the fire injuries revealed that department fire is the major cause of fire incidents. Since the highly flammable cotton is one of the most common materials for home textiles, flame retardant treatment on cellulosic substrate is necessary to safeguard human lives and properties. Stringent legislations have been proposed to eliminate the application of halogenated flame retardants for a few decades. Recently, dominant flame retardants for textiles are phosphorus or phosphorous-nitrogen based. However, more voices are emerging on the potential toxic effects caused by the gas phase phosphorus radicals. Therefore, a new boron-nitrogen polymer (PEIPA) was synthesized to provide a green alternative for flame retardant finishing on cotton fabrics. An organic boron compound, phenylboronic acid (PA) was successfully bonded to the branched polyethylenimine (PEI), which was confirmed by proton nuclear magnetic resonance and Fourier transform infrared analysis. Identified by thermogravimetric analysis, the polymer with molar ratio 1:1 of ethylenimine (EI) : PA, denoted as PEIPA 1:1, presented the best thermal-oxidative stability. PEIPA 1:1 was easily applied on cotton fabric through a simple dipping method with high add-on percentage in acetone medium. The fabric with 33.8 wt% add-on got self-extinguishing ability. Scanning electron microscopy analysis on the char morphology of the treated fabrics revealed the intumescent flame retardant mechanism. Moreover, evolved gases analysis in thermogravimetric Fourier transform infrared spectroscopy revealed that the treated cotton has great reduction in flammable volatiles and total amount of gases. PEIPA 1:1 coating on cotton has certain sustainability in water and poor durability in detergent solution. Therefore, a novel crosslinked FR system (PEIPA 3:1 / NeoFR) was developed. The treated fabric got very high LOI value, i.e. 29.6, which showing excellent flame retardancy and significantly improved laundering durability. On the other hand, PEIPA 1:1 was also applied on a green thermoplastic polymer, Polylactic acid (PLA), for further exploration of the application of the novel flame retardant. Significant char promotion was observed on the PEIPA blended PLA after burning by direct gas flame. The present study provides a platform to investigate the less popular type flame retardant (i.e. organic boron-nitrogen based) on cotton, to learn more about flame retardant mechanisms of B-N containing compounds. |
| Rights: | All rights reserved |
| Access: | open access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 991022090659503411.pdf | For All Users | 4.84 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/9332