Synergistic effect of zeolite 4A on thermal, mechanical and flame retardant properties of intumescent flame retardant HDPE composites

In this study, the effects of the synthetic zeolite 4A in combination with the IFR system consisting of ammonium polyphosphate (APP) and tris (2-hydroxyethyl) isocynurate (THEIC) on thermal degradation, mechanical properties, flame retardancy and char formation of high-density polyethylene composites were investigated by limiting oxygen index (LOI) measurement, cone calorimetry, scanning electron microscopy and laser Raman spectroscopy. The LOI value of HD/FR/Z-0.5 composite with an optimum content of 0.5 wt% zeolite 4A and 25 wt % of total flame retardant reaches 26.3%. A low loading of zeolite 4A can improve the bench-scale combustion performance as determined by cone calorimetry, and promote the formation of more compact char residue with a highly graphitic structure. However, a low loading of zeolite in combination with the IFR system consisting of APP and THEIC produces no significant changes in mechanical performance.
Source: Polymer Testing - Category: Chemistry Source Type: research

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Source: Food Hydrocolloids - Category: Food Science Source Type: research
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Source: Food Hydrocolloids - Category: Food Science Source Type: research
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Source: Food Chemistry - Category: Food Science Source Type: research
Publication date: Available online 16 November 2019Source: Carbohydrate PolymersAuthor(s): Hossein Rahmani, Seyed Heydar Mahmoudi Najafi, Alireza Ashori, Marzieh Arab Fashapoyeh, Farzaneh Aziz Mohseni, Sara TorkamanAbstractIn this research, biocomposite films containing chitosan (CS), polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP), with different ratios, have been provided. The effects of adding hexamethylene 1, 6-di(aminocarboxysulfonate) (HMDACS) as cross linker and the formation of urea linkage on mechanical properties such as tensile strength and elongation and dynamic-mechanical properties such as storage mod...
Source: Carbohydrate Polymers - Category: Biomedical Science Source Type: research
Publication date: Available online 15 November 2019Source: Biochimica et Biophysica Acta (BBA) - BiomembranesAuthor(s): Jonathan M. Beard, Penny E. Shockett, John P. O'ReillyAbstractSlow inactivation in voltage-gated Na+ channels (Navs) plays an important physiological role in excitable tissues (muscle, heart, nerves) and mutations that disrupt Nav slow inactivation can result in pathophysiologies (myotonia, arrhythmias, epilepsy). While the molecular mechanisms responsible for slow inactivation remain elusive, previous studies have suggested a role for the pore-lining D1-S6 helix. The goals of this research were to determ...
Source: Biochimica et Biophysica Acta (BBA) Biomembranes - Category: Biochemistry Source Type: research
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Source: Polymer Testing - Category: Chemistry Source Type: research
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Source: Journal of Industrial and Engineering Chemistry - Category: Chemistry Source Type: research
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Source: Journal of Industrial and Engineering Chemistry - Category: Chemistry Source Type: research
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Source: Journal of Industrial and Engineering Chemistry - Category: Chemistry Source Type: research
Publication date: 25 January 2020Source: Journal of Industrial and Engineering Chemistry, Volume 81Author(s): Nabanita Pal, Seunghyeok Im, Eun-Bum Cho, Hyunhong Kim, Jongnam ParkAbstractMorphology oriented synthesis of metal oxide doped silica structures have fascinating properties which needed to be explored extensively. In this work, NiO doped silica microsphere with beautiful flower-like morphology has been achieved by adopting a facile surfactant-assisted synthetic route using CTAB-ammonia in H2O–ethanol mixed solvent media. The sol–gel synthesis with effective variations of Ni/Si ratios up to 7.0, followed...
Source: Journal of Industrial and Engineering Chemistry - Category: Chemistry Source Type: research
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