Multifunctional flame-retarded and hydrophobic cotton fabrics modified with a cyclic phosphorus/polysiloxane copolymer

A novel cyclic-shaped copolymer containing silicon and phosphorus, poly (tetramethylcyclosiloxyl spirocyclic pentaerythritol diphosphonate) (PCTSi) was successfully synthesized and characterized by Fourier transform infrared spectra (FT-IR), 1 H and 13 C nuclear magnetic resonance ( 1 H NMR and 13 C...

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Bibliographic Details
Published in:Cellulose (London) 2020-04, Vol.27 (6), p.3531-3549
Main Authors: Liu, Jian, Dong, Chaohong, Zhang, Zheng, Kong, Dezheng, Sun, Heng, Lu, Zhou
Format: Article
Language:English
Subjects:
Bioorganic Chemistry
Ceramics
Chemistry
Chemistry and Materials Science
Combustion
Composites
Contact angle
Copolymers
Cotton
Cotton fabrics
Crystal structure
Fabrics
Flame retardants
Flammability
Flammable gases
Fourier transforms
Glass
Hydrophobicity
Infrared analysis
Infrared spectra
Infrared spectroscopy
Morphology
Natural Materials
NMR
Nuclear magnetic resonance
Organic Chemistry
Original Research
Phosphorus
Physical Chemistry
Polymer Sciences
Scanning electron microscopy
Sustainable Development
Thermal degradation
Thermogravimetric analysis
Washing
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Summary:A novel cyclic-shaped copolymer containing silicon and phosphorus, poly (tetramethylcyclosiloxyl spirocyclic pentaerythritol diphosphonate) (PCTSi) was successfully synthesized and characterized by Fourier transform infrared spectra (FT-IR), 1 H and 13 C nuclear magnetic resonance ( 1 H NMR and 13 C NMR) for the preparation of flame retardant and hydrophobic cotton fabrics. The surface morphology of treated cotton fabrics was characterized by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The thermal degradation and combustion properties of cotton fabrics before and after treatment were investigated by thermogravimetric (TG) analysis, limiting oxygen index (LOI) test, vertical burning test and cone calorimetry test. After treated with PCTSi, the LOI value of coton fabrics increased to 29.5%, which was significantly higher than untreated cotton fabrics and the LOI value remained at above of 26.0% after 20 washing times. In the vertical burning test, the PCTSi treated cotton fabrics showed no afterflame and afterglow with a minimum char length of 8.5 cm. Thermogravimetric analysis coupled with Fourier transform infrared analysis (TG-FTIR) results indicated that flame-retardant cotton fabrics released nonflammable gases and less flammable gases than the untreated cotton fabrics. X-ray diffraction analysis demonstrated that the crystal structures of the PCTSi-treated cotton were almost unaffected. According to the results of TG-FTIR, SEM, EDS, and analyses of char residues, the cyclic-shaped copolymer can significantly improve flame retardant performance of cotton fabric by promoting the generation of char layer and the release of noncombustible volatiles. The treated cotton fabrics showed excellent hydrophobic properties, which reached a contact angle (CA) of 150° compared with cotton fabrics without treatment. In addition, 119.18° of CA and 26.0% of LOI value can be maintained after 20 washing times. Graphic abstract
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-020-03016-w