Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 18, Pages 9349-9363Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b02141
Keywords
cotton; polyester/cotton blends; textiles; polyphosphazenes; permanent flame retardant finishing; photochemical immobilization
Funding
- Forschungskuratorium Textil e.V. [IGF 16780 N]
- program Industrielle Gemeinschaftsforschung (IGF)
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Despite their excellent flame retardant properties, polyphosphazenes are currently not used as flame retardant agents for textile finishing, because a permanent fixation on the substrate surface has failed so far. Here, We present the successful synthesis and characterization of a nuncombustible and foam-forming polyphosphazene derivative, that can be immobilized durably on cotton and different cotton/polyester blended fabrics using photoinduced grafting reactions. The flame retardant properties are improved, a higher limiting oxygen index is found, and the modified textiles pass several standardized flammability tests. As flame retardant mechanism a synergistic effect between the immobilized polyphosphazene and the textile Substrate was observed. The polyphosphazene finishing induces an earlier decomposition of the material with a reduced mass loss in thermogravimetric analysis. The decomposition of cotton and polyester leads to the formation of phosphorus oxynitride, which forms a protecting barrier layer On the fiber surface. In addition, the permanence of the flame retardant finishing was proven by laundry and abrasion tests.
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