The role of nanoparticle geometry in flame retardancy of polylactide nanocomposites containing aluminium phosphinate

Isitman, Nihat Ali
Doğan, Mehmet Onur
Kaynak, Cevdet
Although there is considerable research effort in the development of halogen-free flame-retardant polylactide (PLA), a bio-based aliphatic polyester, the potential synergistic interactions of nanoparticles and conventional additives have scarcely been considered. Therefore, this study aimed to investigate the influence of nanofiller geometry on fire retardancy of PLA nanocomposites containing aluminium diethylphosphinate (AlPi) flame retardant. For this purpose, a variety of nanofiller geometries were utilized, spherical nanosilica (0-D), rod-like halloysite (1-D) and plate-like montmorillonite (2-D). Fire performance increased in the order of rod-like < spherical << plate-like geometries which matched qualitatively with the effective surface area of nanoparticles in the nanocomposite. Owing to intercalation/exfoliation (nanodispersion) of montmorillonite, a large surface area was obtained which facilitated rapid migration and accumulation of platelets on exposed sample surface prior to intumescent char formation. By this means, intumescence was hindered and a thicker aluminium phosphate/montmorillonite nanocomposite char was formed acting as a strong transport barrier. Investigations on microstructural evolution of residues revealed extraordinarily regular, hollow-fibrillar structures during combustion of PLA/AlPi. The corresponding nanocomposites formed micro-porous ceramic-like structures composed of spherical aluminium phosphate nanoparticles, covering the surface and protecting the pyrolysing melt.


Nanoclay and carbon nanotubes as potential synergists of an organophosphorus flame-retardant in poly(methyl methacrylate)
Isitman, Nihat Ali; Kaynak, Cevdet (2010-09-01)
This study explores whether nanoparticles incorporated in polymers always act as synergists of conventional flame-retardant additives. For this purpose, two different filler nanoparticles, namely organically modified layered-silicate clay minerals or nanoclays and multi-walled carbon nanotubes, were incorporated in poly(methyl methacrylate) filled with an organophosphorus flame-retardant that acts through intumescence. Effective dispersion techniques specific to each nanoparticle were utilized and prepared ...
The performance of polyethersulfone nanocomposite membrane in the removal of industrial dyes
Mahmoudian, Mehdi; Ghasemıkouchameshgı, Mahmoud (2021-05-14)
In the present study, graphene oxide was functionalized by hyperbranched epoxy and then used as an additive in the polyethersulfone membrane. The process of preparation and characterization of the synthesized hyperbranched epoxy, and graphene oxide modification was investigated by some analysis such as XRD, EDAX, FTIR, NMR, and TGA. Morphology of modified nanostructures, their distribution in the membrane matrix, and morphology of membranes were evaluated by TEM, FESEM analysis. Experimental results showed ...
Use of zinc borate as the third component of a traditional brominated flame retardant system in acrylonitrile butadiene styrene
Kaynak, Cevdet (2013-11-01)
Because zinc borate is an effective smoke suppressant and cheaper than antimony trioxide, the main aim of this study was to investigate usability of zinc borate as the third component of a traditional binary Br/Sb2O3 system in acrylonitrile butadiene styrene. Limiting oxygen index, UL-94, and mass loss cone calorimeter studies indicated that almost all flame retardancy parameters were kept when certain percentages of antimony trioxide were replaced with zinc borate. Residue analysis revealed that the predom...
The Effect of Rolling and Aging on Mechanical and Tribological Properties in B4C Particle Reinforced Al7075 Matrix Composites
Demir, Mehmet Emin; Çelik, Yahya Hışman; Kalkanlı, Ali (2022-01-01)
© 2022, King Fahd University of Petroleum & Minerals.Strengthening, heat treating, or rolling these alloys with different reinforcement particles positively affects the physical, mechanical and tribological properties. In this study, materials were produced by squeeze casting method by adding B4C particle to Al7075 alloy matrix in 4 different reinforcement ratios (4%, 8%, 10%, 12%). The physical, mechanical, and tribological properties of B4C/Al7075 composites were compared to the Al7075 alloy. In addition,...
The influence of humic acids extracted from Chaouia soil on the behavior of transition metal ions and pesticides
Bougarrani, S.; El Azzouzi, L.; Bouzıanı, Asmae; Akel, S.; Latrach, L.; Baicha, Z.; El Azzouzi, M. (2017-01-01)
Humic acids (HAs) exist ubiquitously in environments and have a variety of functional groups, which allow them to complex with metal ions and pesticides. Furthermore, these interactions can not only alter the environmental behavior, but also influence the removal and transportation of those pollutants. The study of the interaction between Cu (II), VO (II) and Mn (II) with HAs provides environmental information on the oxidation states of paramagnetic metals and their mechanisms of binding to humic acids. Ele...
Citation Formats
N. A. Isitman, M. O. Doğan, E. BAYRAMLI, and C. Kaynak, “The role of nanoparticle geometry in flame retardancy of polylactide nanocomposites containing aluminium phosphinate,” POLYMER DEGRADATION AND STABILITY, pp. 1285–1296, 2012, Accessed: 00, 2020. [Online]. Available: