Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7606578 | Journal of Analytical and Applied Pyrolysis | 2016 | 10 Pages |
Abstract
Here, nanostructured LbL coatings based on ammonium polyphosphate (APP) and octapropyl ammonium polyhedral oligomeric silsesquioxane (POSS) layer have been deposited on acrylic fabrics exploiting the LbL assembly. More specifically, the coatings consisting of 4 or 6 bi-layers have been found to homogeneously cover each fibre, creating an intimate interconnection between those adjacent. By this way, the acrylic fibres turned out to be efficiently protected the exposure to a 20Â mm methane flame or 35Â kW/m2 heat flux. As a result, the melt dripping phenomenon has been completely suppressed and the combustion rate significantly reduced. The success of the proposed treatments has been ascribed to (i) the char-former character of APP, (ii) the ceramic thermal insulating barrier created by POSS and (iii) the intimate contact between these two species, only occurring in a LbL assembly. These three aspects have proven to be responsible of a significant modification in the thermal degradation mechanism of acrylic fibres that discussed as key role in their combustion.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Federico Carosio, Jenny Alongi,