Synergistic effect of chitosan-based flame retardant and modified clay on the flammability properties of LLDPE

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• 作者：Mohamed Hassan^a ; ^{Mohamed_A_Hassan@hotmail.com" class="auth_mail" title="E-mail the corresponding author} ; Mohamed Nour^a ; ^{M_A_nour@hotmail.com" class="auth_mail" title="E-mail the corresponding author} ; Yasser Abdelmonem^b ; ^{Ykabdelmonem@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Ghada Makhlouf^a ; ^{researcherghada@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; Aksam Abdelkhalik^a ; ^{aksamhassan85@gmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Synergistic effect ; Chitosan ; OMMT ; Intumescent ; Flammability ; LLDPE
• 刊名：Polymer Degradation and Stability
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：133
• 期：Complete
• 页码：8-15
• 全文大小：1769 K

文摘

The synergistic effect of melamine salt of chitosan phosphate (MCHP) and organic modified montmorillonite (OMMT) on the thermal stability and flammability properties of linear low density polyethylene (LLDPE) was studied. MCHP was synthesized by reaction of chitosan phosphate with melamine. OMMT was formed by the reaction of cetyl trimethyl ammonium bromide (CTAB) with sodium montmorillonite. The structures of MCHP and OMMT were characterized by FTIR and ¹H NMR. The thermogravimetric analysis of various LLDPE composites showed that the addition of OMMT to MCHP effectively improved the thermal stability of LLDPE and increased the char residues. The flammability properties of LLDPE composites demonstrated that addition of 1 wt% OMMT to 30 wt% MCHP promoted achieving V-0 rating in UL-94 test. Moreover, it participated remarkably in decreasing the peak of heat release rate (pHRR), total heat release (THR), CO and CO₂ emissions, and fire growth index (FGI). This indicated that addition of OMMT/MCHP reduced the fire risks of LLDPE. The digital photographs and SEM images of char formed after cone calorimeter test showed that addition of 1 wt% OMMT with MCHP promoted the formation of coherent and compact char layer.