Study on thermal stability and flame retardancy of polymer/layered silicate nanocomposites based on POE and POE-g -MAH

2014 ◽  
Vol 54 (12) ◽  
pp. 2911-2917 ◽  
Author(s):  
Shuhao Qin ◽  
Qinfeng Li ◽  
Min He ◽  
Huiju Shao ◽  
Jie Yu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Flame Retardancy ◽  
Layered Silicate ◽  
Silicate Nanocomposites

Influence of silicon dioxide addition and processing methods on structure, thermal stability and flame retardancy of EVA/NR blend nanocomposite foams

2020 ◽  
pp. 147776062095343
Author(s):  
Alif Walong ◽  
Bencha Thongnuanchan ◽  
Tadamoto Sakai ◽  
Natinee Lopattananon
Keyword(s):  
Thermal Stability ◽  
Silicon Dioxide ◽  
Flame Retardant ◽  
Flame Retardancy ◽  
Layered Silicate ◽  
Melt Mixing ◽  
Limiting Oxygen Index ◽  
Char Layer ◽  
Nanocomposite Foams ◽  
Silicon Based

Rubber nanocomposite foams based on 60/40 ethylene vinyl acetate (EVA)/natural rubber (NR) were melt-mixed with flame retardant silicon dioxide (SiO2) (20 parts per hundred rubber, phr), and foamed by compression molding process. In this study, the effect of mixing phenomena of SiO2 through two different compounding techniques such as direct mixing (DM) and phase selective mixing (PSM) methods on structure, thermal stability, combustility and flame retardancy of EVA/NR blend nanocomposite foams were investigated. DM method is a melt mixing of EVA, NR, layered silicate and SiO2, followed by foaming. PSM is a new method based on pre-mixing EVA with SiO2, then melt mixing of EVA/SiO2 masterbatch with NR and layered silicate, and finally foaming. Based on TEM technique, it was found that the SiO2 was exclusively located in dispersed NR phase for the sample prepared by DM method, and the SiO2 was preferably dispersed in continuous EVA matrix when PSM method was employed. However, the different mixing methods did not significantly alter their cellular structures. The thermal stability and char residue content of foamed samples with SiO2 increased obviously when compared with those of corresponding foams without SiO2. The results based on limiting oxygen index (LOI) test and oxygen bomb calorimetry indicated that the foams combined with SiO2 had better combustion resistance and flame retardancy due to barrier effect of thermally stable silicon-based char layer. Further, the SiO2 filled foamed system obtained from the PSM method showed a higher degree of improvement in thermal stability, combustion resistance and flame retardancy than that of DM method because the homogeneous dispersion of SiO2 in EVA matrix rather than the selective dispersion in NR phase. This resulted in the continuity of flame retardant EVA/SiO2 phase in the 60/40 EVA/NR nanocomposite foams, which exerted more efficient fire barrier of the silicon-based char layer.

Preparation of Anion Modified Montmorillonite-Polystyrene Nanocomposite by Suspension Polymerization

2009 ◽  
Vol 87-88 ◽  
pp. 499-503
Author(s):  
Yi Wang ◽  
Hui Xia Feng ◽  
Jian Hui Qiu
Keyword(s):  
Thermal Stability ◽  
Anionic Surfactants ◽  
Suspension Polymerization ◽  
Layered Silicate ◽  
High Thermal Stability ◽  
X Ray Diffraction ◽  
X Ray ◽  
Modified Montmorillonite ◽  
Silicate Nanocomposites ◽  
Ft Ir

To ensure good compatibility between polymer and montmorillonite (MMT), three types organophilic-MMT were prepared and the influence of modifying agent style on the modification effect was studied. The results of X-ray diffraction(XRD) show that the modified reagents are all intercalated into the galleries of MMT, which are also proved by patterns of FT-IR and thermogravimetric analysis(TGA), and the spacing of MMT layers increases from 1.23 nm of the pristine MMT to 2.10nm, 3.52nm and 4.14nm for CTAB, SDS and DBS modified MMT respectively. The results also indicate that the d-spacing and exfoliation degree of anionic surfactants inserted MMT is bigger than that of the cationic surfactants treated MMT, which are usually used to preparation polymer layered silicate nanocomposites in literatures. So PS/SDS-MMT and PS/DBS-MMT nanocomposites were prepared by suspension polymerization. The structure of complex were characterized by XRD and no peak can be observed by the spectra, which suggest that the clay platelets have been exfoliated and dispersed in the PS matrix and the both complex are all have exfoliated structure. FT-IR spectrums analysis confirmed the existence of MMT which implied that the layers of silicate was distributing in composites. The results of TGA show that nanocomposites possess exceptionally high thermal stability and the DBS treated composite has higher thermal stability than that of SDS treated.

Flame retardancy and char microstructure of nylon-6/layered silicate nanocomposites

2007 ◽  
Vol 104 (3) ◽  
pp. 1540-1550 ◽  
Author(s):  
Kadhiravan Shanmuganathan ◽  
Sarang Deodhar ◽  
Nicholas Dembsey ◽  
Qinguo Fan ◽  
Paul D. Calvert ◽  
...  
Keyword(s):  
Flame Retardancy ◽  
Layered Silicate ◽  
Nylon 6 ◽  
Silicate Nanocomposites

Thermal stability of ammonium salts as compatibilizers in polymer/layered silicate nanocomposites

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Maurizio Galimberti ◽  
Marco Martino ◽  
Monica Guenzi ◽  
Gabriella Leonardi ◽  
Attilio Citterio
Keyword(s):  
Thermal Stability ◽  
Layered Silicate ◽  
Ammonium Cation ◽  
Ammonium Salts ◽  
Chloride Salt ◽  
Tertiary Amines ◽  
Silicate Nanocomposites ◽  
Thermal Stability Of ◽  
Isoprene Rubber

AbstractThermal stability of alkyl and arylalkyl quaternary ammonium cation (onium) in starting chloride salt, in organoclay obtained after exchange with montmorillonite (MMT) and after mixing of the organoclay with isoprene rubber was examined using conventional TGA and by mass spectrometry pyrolysis/GC-MS. Degradation was observed to occur at T ≥ 170 °C for organoclays and the main volatile compounds were identified as tertiary amines, chloroalkanes and alkenes. Mechanisms for their formation are proposed and the role of residual onium chloride and basic centers of layered silicate is discussed.

Characterisation of the Chitosan/Layered Silicate Nanocomposites

2009 ◽  
Vol 151 ◽  
pp. 123-128 ◽  
Author(s):  
Catalina Natalia Cheaburu ◽  
Cornelia Vasile ◽  
Donatella Duraccio ◽  
Sossio Cimmino
Keyword(s):  
Thermal Stability ◽  
Layered Silicate ◽  
Interlayer Distance ◽  
X Ray Diffraction ◽  
Optimum Amount ◽  
X Ray ◽  
Silicate Nanocomposites ◽  
Silicate Layers

Characterization of chitosan / layered silicate nanocomposites obtained by solution-mixing technique, having different compositions including treated and untreated montmorilonite (MMT) has been performed. The optimum amount of MMT and also the effect of nanoparticles type on nanocomposite properties by DSC, X-ray diffraction and TG measurements have been established. The chitosan chains were inserted into silicate layers to form the intercalated nanocomposites. The interlayer distance of the silicates in the nanocomposites enlarged as their amount increased. The stiffness and thermal stability enhanced.

Flame Retardancy of Nanocomposites - from Research to Reality

2005 ◽  
Vol 13 (5) ◽  
pp. 529-538 ◽  
Author(s):  
Günter Beyer
Keyword(s):  
Flame Retardancy ◽  
Flame Retardants ◽  
Layered Silicate ◽  
Layered Silicates ◽  
Polymer Systems ◽  
New Class ◽  
Silicate Nanocomposites ◽  
Flame Retardant Properties ◽  
Flame Retardancy Mechanism ◽  
Polymer Combustion

Nanocomposites are a new class of polymer systems. Modified layered silicates as fillers are dispersed at a nm-level within a polymer matrix. For nanocomposites new and extraordinary properties are observed. The thermal stability and the flame retardancy of polymers forming nanocomposites are improved. The flame retardancy mechanism of layered silicate nanocomposites is based on the char formation and its structure; the char insulates the polymer from heat and acts as a barrier, reducing the escape of volatile gases from the polymer combustion. The cone calorimeter is a very useful tool to investigate the properties of flame retardancy. The combination of organoclays with traditional flame retardants is a general way to improve the flame retardant properties of polymers.

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