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Please use this identifier to cite or link to this item: http://dspace.vgtu.lt/handle/1/4199

Title: Polyurethane Hybrid Composites Reinforced with Lavender Residue Functionalized with Kaolinite and Hydroxyapatite
Authors: Członka, Sylwia
Kairytė, Agnė
Miedzińska, Karolina
Strąkowska, Anna
Keywords: polyurethane composites
lavender
kaolinite
hydroxyapatite
high-ball milling process
thermal conductivity
Issue Date: 2021
Publisher: MDPI
Citation: Członka, S.; Kairytė, A.; Miedzińska, K.; Strąkowska, A. Polyurethane Hybrid Composites Reinforced with Lavender Residue Functionalized with Kaolinite and Hydroxyapatite. Materials 2021, 14, 415. https://doi.org/10.3390/ma14020415
Series/Report no.: 14;2
Abstract: Polyurethane (PUR) composites were modified with 2 wt.% of lavender fillers functionalized with kaolinite (K) and hydroxyapatite (HA). The impact of lavender fillers on selected properties of PUR composites, such as rheological properties (dynamic viscosity, foaming behavior), mechanical properties (compressive strength, flexural strength, impact strength), insulation properties (thermal conductivity), thermal characteristic (temperature of thermal decomposition stages), flame retardancy (e.g., ignition time, limiting oxygen index, heat peak release) and performance properties (water uptake, contact angle) was investigated. Among all modified types of PUR composites, the greatest improvement was observed for PUR composites filled with lavender fillers functionalized with kaolinite and hydroxyapatite. For example, on the addition of functionalized lavender fillers, the compressive strength was enhanced by ~16–18%, flexural strength by ~9–12%, and impact strength by ~7%. Due to the functionalization of lavender filler with thermally stable flame retardant compounds, such modified PUR composites were characterized by higher temperatures of thermal decomposition. Most importantly, PUR composites filled with flame retardant compounds exhibited improved flame resistance characteristics—in both cases, the value of peak heat release was reduced by ~50%, while the value of total smoke release was reduced by ~30%.
Description: This article belongs to the Special Issue Environmentally Friendly Polymeric Blends from Renewable Sources
URI: http://dspace.vgtu.lt/handle/1/4199
ISSN: 1996-1944
Appears in Collections:Moksliniai straipsniai / Research articles

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