scholarly journals Effect of POSS Particles and Synergism Action of POSS and Poly-(Melamine Phosphate) on the Thermal Properties and Flame Retardance of Silicone Rubber Composites

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1298 ◽  
Author(s):  
Przemysław Rybiński ◽  
Bartłomiej Syrek ◽  
Dariusz Bradło ◽  
Witold Żukowski
Keyword(s):  
Thermal Properties ◽  
Flame Retardant ◽  
Silicone Rubber ◽  
Degradation Mechanism ◽  
Rubber Matrix ◽  
Flame Retardance ◽  
Test Results ◽  
Rubber Composites ◽  
X Ray ◽  
Melamine Phosphate

This article presents flame retardant compounds for silicone rubber (SR) in the form of polyhedral oligomeric silsequioxanes (POSS), containing both isobutyl groups and amino-propyl (AM-POSS) or chloro-propyl group (HA-POSS) or vinyl groups (OL-POSS). Silsequioxanes were incorporated into the silicone rubber matrix in a quantity of 3 and 6 parts by wt by the method of reactive stirring with the use of a laboratory mixing mill. Based on the analyses performed by TG (Thermogravimetry) FTIR (Fourier Transform Infrared Spectroscopy), conical calorimeter, and SEM-EDX (Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy) methods, the thermal degradation mechanism of non-cross-linked and cross-linked silicone rubber has been elucidated. The effects of POSS, and POSS in a synergic system with melamine polyphosphate (MPP), on the thermal properties and flammability of silicone rubber composites were presented. Based on the test results obtained, a mechanism of flame retardant action POSS and POSS-MPP has been proposed. It has been shown that POSS, especially with MPP, considerably increases the thermal stability and decreases the flammability of the SR rubber composites under investigation.

Study on Preparation and Properties of APP Filled Flame Retardant Silicone Rubber Composites

2014 ◽  
Vol 1082 ◽  
pp. 379-382 ◽  
Author(s):  
Yu Qi Liu ◽  
Jin Cheng Wang
Keyword(s):  
Thermal Stability ◽  
Flame Retardant ◽  
Tensile Properties ◽  
Silicone Rubber ◽  
Room Temperature ◽  
Flame Retardance ◽  
Rubber Composites ◽  
Thermal Stability Of

A flame-retardant room-temperature vulcanizated silicone rubber (RTV) was prepared with the addition of APP. The effect of different amount of APP on flame retardance, tensile properties, and thermal stability of RTV were studied.Results showed that RTV/APP composites possessed better flame-retardant behaviour, better initial thermal stability, but worse tensile properties.

Enhancement of styrene-butadiene rubber composites using kaolin covered with metal oxide pigments

2015 ◽  
Vol 44 (2) ◽  
pp. 57-73 ◽  
Author(s):  
Salwa H El-Sabbagh ◽  
Nivin M. Ahmed
Keyword(s):  
Electron Microscopy ◽  
Thermal Properties ◽  
Metal Oxide ◽  
Styrene Butadiene Rubber ◽  
Core Shell ◽  
Butadiene Rubber ◽  
Rubber Composites ◽  
Content Type ◽  
X Ray ◽  
Styrene Butadiene

Purpose – This paper aims to express in detail the rheological, morphological and thermal properties of unpigmented and pigmented styrene-butadiene rubber composites with new prepared inorganic pigment based on kaolin covered with a thin layer of calcium and magnesium oxides or mixed oxide of both together. These new pigments combine the properties of both their constituents (kaolin and metal oxides), which are a new trend in inorganic pigments called core-shell pigments. The pigments used for comparison are kaolin (K), CaO/kaolin (CaO/K), MgO/kaolin (MgO/K) and CaO.MgO/kaolin (CaO.MgO/K). Design/methodology/approach – The different pigments were characterized using different analytical and spectrophotometric techniques, such as X-ray diffraction, scanning electron microscopy/energy dispersive X-ray and transmission electron microscopy, while rubber vulcanizates' rheological, morphological, swelling and thermal properties were examined using different standard and instrumental testing and methods. Findings – The study revealed that there is a significant effect of the new prepared pigments on SBR properties, where the optimum pigment loading was 40 phr for CaO/kaolin, while it was 2.5 phr for MgO/kaolin. Studying the effect of different ratios of oxides on kaolin (5, 10 and 20 per cent), different loadings of these pigments ranging between 2.5 and 40 phr were done for each pigment. These modified kaolin or core-shell metal oxide/kaolin pigments imparted new and improved reinforcing properties to SBR vulcanizates. Research limitations/implications – No research limitations were found. Practical implications – Core-shell MgO/kaolin pigments are eco-friendly and can replace other expensive pigments that are usually used as fillers in the rubber industry with less expenses and comparable efficiency. Originality/value – These new pigments are cheap and efficient and can be used in different fields other than rubber.

Clay modification with silane compounds and characterization of the silicone rubber/clay composites

2012 ◽  
Vol 32 (8-9) ◽  
pp. 493-502 ◽  
Author(s):  
Kyeong Hoon Jang ◽  
Eung-Soo Kim ◽  
Young Ho Jeon ◽  
Jin-San Yoon
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Silicone Rubber ◽  
Cross Linking ◽  
Mechanical And Thermal Properties ◽  
Curing Agent ◽  
Thiol Groups ◽  
Rubber Composites ◽  
Clay Modification

Abstract Na+ montmorillonite (MMT) was modified with benzyldimethyltetradecylammonium chloride (B13) and further with (3-mercaptopropyl)triethoxysilane and vinyltrimethoxysilane to prepare B13-MMT, mercaptomethylorthosilicate modified MMT (MTMO), and vinyltrimethoxysilane modified MMT (VTMO), respectively. The pristine and modified clays were compounded with an HTV-type silicone rubber (GP-30®), and the physical properties and morphology of the resulting rubber composites were examined. Both HTV/MTMO and HTV/VTMO exhibited an intercalated/exfoliated coexisting morphology, but the degree of exfoliation of the former composite was higher than that of the latter. Moreover, the thermal stability, as assessed by the onset temperature of thermal degradation, as well as the tensile stress, elongation at the break, and tear strength of HTV/MTMO was higher than those of HTV/B13-MMT and HTV/VTMO. However, the cross-linking density of HTV/MTMO was the lowest among the composites examined because the thiol groups of MTMO extinguished and abstracted the radicals formed by the curing agent. Accordingly, the improved mechanical and thermal properties of HTV/MTMO were attributed to the enhanced interactions between HTV and MTMO due to the chemical reaction between the thiol groups of MTMO and the vinyl groups of HTV.

Thermal Properties of the PA66/PC/Silicone Rubber Composites

2010 ◽  
Vol 50 (1) ◽  
pp. 111-122 ◽  
Author(s):  
Jun Chen ◽  
Wei Wu ◽  
Tingting Zhou ◽  
Wei Fan ◽  
Qizhen Lu
Keyword(s):  
Thermal Properties ◽  
Silicone Rubber ◽  
Rubber Composites

scholarly journals Flame Retardance and Char Analysis of Environmental Friendly Polyurethane Hyperbranched Organic-Inorganic Hybrid Using the Sol-Gel Method

2020 ◽  
Author(s):  
Ming-Yuan Shen ◽  
Chen-Feng Kuan ◽  
Hsu-Chiang Kuan ◽  
Cing-Yu Ke ◽  
Chin- Lung Chiang*
Keyword(s):  
Flame Retardant ◽  
Hybrid Material ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Flame Retardance ◽  
Inorganic Hybrid ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Nitrogen Phosphorus

This study used the sol–gel method to synthesize a non-halogenated hyperbranched flame retardant containing nitrogen, phosphorus and silicon, HBNPSi, which was then added to a polyurethane (PU) matrix to form an organic–inorganic hybrid material. Using 29Si nuclear magnetic resonance, energy-dispersive X-ray spectroscopy of P- and Si-mapping, scanning electron microscopy, and X-ray photoelectron spectroscopy, this study determined the organic and inorganic dispersity, morphology, and flame retardance mechanism of the hybrid material. The condensation density of the hybrid material PU/HBNPSi was found to be 74.4%. High condensation density indicates a dense network structure of the material. The P- and Si-mapping showed that adding inorganic additives in quantities of either 20% or 40% results in homogeneous dispersion of the inorganic fillers in the polymer matrix without agglomeration, indicating that the organic and inorganic phases had excellent compatibility. In the burning test, adding HBNPSi to PU resulted in the material passing the UL-94 standard at the V2 level, unlike the pristine PU, which did not meet the standard. The results demonstrated that after non-halogenated flame retardant was added to PU, the material’s flammability and dripping were lower, thereby proving that flame retardants containing elements such as nitrogen, phosphorus, and silicon exert an excellent flame retardant synergistic effect.

scholarly journals Thermal properties and fire behavior of polyethylene with a mixture of copper phosphate and melamine phosphate as a novel flame retardant

2020 ◽  
Vol 115 ◽  
pp. 103137 ◽  
Author(s):  
K. Salasinska ◽  
K. Mizera ◽  
M. Celiński ◽  
P. Kozikowski ◽  
M. Borucka ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Flame Retardant ◽  
Fire Behavior ◽  
Melamine Phosphate ◽  
Copper Phosphate
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