4 years ago

Thermal Stability and Fire Retardant Properties of Polyamide 11 Microcomposites Containing Different Lignins

Thermal Stability and Fire Retardant Properties of Polyamide 11 Microcomposites Containing Different Lignins
J. Guan, N. Mandlekar, S. Giraud, G. Malucelli, F. Rault, A. Cayla, F. Salaün
This study investigates the influence of various lignins and their content on the thermal stability and fire retardancy of biobased polyamide 11 (PA). Microcomposites based on PA and containing 5, 10, 15, and 20 wt % different lignins were prepared with a twin-screw extruder. Morphological analysis showed good interfacial interaction and uniform distribution of lignin particles within the resulting microcomposites. Further, thermogravimetric analyses carried out in inert atmosphere indicated that, unlike kraft lignin, which is able to give rise to the formation of lower char residue (41–48 wt % at 600 °C), the sulfonated counterpart provides a higher thermal stability as well as a higher char residue (55–58 wt %). Furthermore, vertical flame spread tests clearly showed that 15 wt % is the optimum of kraft or sulfonated lignin loading to achieve improved flame retardant properties and a V1 rating. In addition, a cone calorimeter was exploited to study forced combustion behavior; in particular the microcomposites containing sulfonated lignin revealed significant reductions of the peak of the heat release rate (−51%) and of the total heat release (−23%) and a lower average mass loss rate together with a noticeable increase of the final residual mass (about 9 wt %). Conversely, the microcomposites containing kraft lignins showed opposite effect, since heat release rate (HRR) and total heat release (THR) values increased in the presence of kraft lignin.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b03085

DOI: 10.1021/acs.iecr.7b03085

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.