The influence of CaCO 3 filler component on thermal decomposition process of PP/LDPE/DAP ternary blend (original) (raw)
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Polymers for Advanced Technologies, 2013
In this study, the mechanical properties and non-isothermal degradation kinetics of polypropylene (PP), high-density polyethylene (HDPE) with dilauroyl peroxide and their blends in different mixture ratios were investigated. The effects of adding dilauroyl peroxide (0-0.20 wt%) on the mechanical and thermal properties of PP + HDPE blends have been studied. On the other hand, the kinetics of the thermal degradation and thermal oxidative degradation of PP + HDPE (80/20 wt%) blends were studied in different atmospheres, to analyze their thermal stability. The kinetic and thermodynamic parameters such as the activation energy, E a , the pre-exponential factor, A, the reaction order, n, the entropy change, the enthalpy change, and the free energies of activated complex related to PP, HDPE, and blend systems were calculated by means of the several methods on the basis of the single heating rate. A computer program was developed for automatically processing the data to estimate the reaction parameters by using different models. Most appropriate method was determined for each decomposition step according to the least-squares linear regression.
Polymers for Advanced Technologies, 2009
Polypropylene R low density polyethylene (PP R LDPE) blends involving 0, 25, 50, 75 and 100 wt% of PP with dialkyl peroxide (DAP) were prepared by melt blending in a single-screw extruder. The effects of adding dialkyl peroxide on mechanical and thermal properties of PP R LDPE blends have been studied. It was found that at lower concentrations of peroxide (e.g., 0-0.08 wt% of dialkyl peroxide) LDPE component is cross-linked and Polypropylene (PP) is degraded in all compositions of PP R LDPE blends. Mechanical properties (Tensile strength at break, at yield and elongation at break), Melt flow index (MFI), hardness, Scanning Electron Microscope (SEM) and thermal analyses (DSC) of these blends were examined. Because of serious degradation or cross-linking the mechanical properties and the crystallinty (%) of those products were decreased as a result of increasing peroxide content.
Revue Roumaine de Chimie, 2020
Blends of polypropylene and high density polyethylene (PP/HDPE) were prepared in the presence of particulate nano-filler calcium carbonate (CaCO 3) treated on the surface with two coupling agents, namely: (organosilane Silquest A-172 and organozirconate Ken-React NZ-12). The structure and properties of the modified blends were investigated by means of differential scanning calorimetry (DSC), wideangle X-ray scattering (WAXS), and macro-and micro-mechanical measurements. The crystallinity of the modified samples (PP, HDPE and their blends) does not seem to be so much affected by the presence of the filler. The study of thermal properties by differential calorimetric analysis (DSC) indicates that the melting temperature varies slightly with the filler content. The presence of coupling agents promotes the development of spherulites by causing a slight increase in crystallinity levels. The addition of the treated or untreated filler to the mixtures increases impact strength and Young's modulus. The micromechanical results show that the microhardness of the PP/HDPE blends notably increases with the PP content. The micromechanical properties of the modified blends only improve slightly as a consequence of the addition of the treated filler with the coupling agents.
PVC/LDPE Blends: Relationship Between Thermal/Mechanical Properties, Structure and Blend Behaviour
International Journal of Engineering and Management Sciences
In this paper the effect of LDPE content in PVC foams are examined on the structure of both the foam and the LDPE. We attempt to understand how LDPE content affects the structure of PVC in blends and how it changes the glass-transition (Tg). These parameters often provide important information related to the overall macromolecular structure of the polymer blend. Thermal analytical techniques such as differential scanning calorimetry (DSC) often used to determine the structural transformation of samples. The effect of the miscibility and composition of the PVC/LDPE foam blends on the thermal stability were also investigated.
A study on thermal behaviour of HDPE/CaCO3 nanocomposites
2006
AbstrAct Purpose: In order to improve physical and mechanical properties of high density polyethylene (HDPE) addition of filler, rigid particles and even elastomer to HDPE is very common. One of the most important filler which is added to it is nano size calcium carbonate (CaCO 3 ). To avoid agglomeration of nano size calcium carbonate addition of fatty acids such as stearic acid is very common. Design/methodology/approach: In the current study, nanocomposites with 10vol% nano size calcium carbonate were prepared. To investigate the role of stearic acid on nanocomposite behaviour, nanoparticles were coated at different stearic acid content. Thermal behaviour of high density polyethylene and its nanocomposites reinforced with both uncoated and coated calcium carbonate were investigated. For this purpose differential scanning calorimetry (DSC) test was used. Findings: The results of DSC test showed that addition of 10vol% calcium carbonate to HDPE causes a slightly rise in its melting point but stearic acid content has no significant effect on the melting temperature of HDPE nanocomposites. Research limitations/implications: : Agglomeration of nanosized calcium carbonate during sample preparation was the major research limitation. Originality/value: Crystallization temperature of HDPE with addition of 10vol% calcium carbonate increases, while addition of stearic acid causes to decrease it. Both stearic acid content and 10vol% calcium carbonate have no significant effect on crystallinity index of HDPE.
Calorimetric Analysis of Uncompatibilized Polypropylene/Polystyrene Blend Using DSC
Macromolecular Symposia, 2018
Polymers and polymeric composite materials have steadily reflected their importance in our daily life. In the present work various thermal properties of Polypropylene (PP)/Polystyrene (PS) blend of compositions (100/0, 80.8/19.2, 72.4/27.6, 61.5/38.5, 51/49, 40.7/59.3 and 0/100 wt/wt%) have been studied using Differential Scanning Calorimetry. The obtained results from DSC analysis showed no variation in the glass transition temperature T g of PS indicating the immiscibility of the blend system. The melting temperature (T m) of PP in the blend decreases with increasing PS concentration and the maximum depression ($4.7 C) in T m is found for blend with composition 40.7/59.3. The enthalpy of melting (ΔH m) and the % crystallinity of the blend system also decrease almost linearly with increasing PS concentration. The crystallization temperature (T c) of PP in the blend system is found to $121 C but for virgin PP the crystallization temperature is 140.7 C. This depression in T c is due to presence of droplet like domain of PS in the molten state. In this study also the variation of specific heat with temperature of the blend compositions have been measured.
Thermo-mechanical characteristics of thermally aged polyethylene/polypropylene blends
Materials & Design, 2010
Polyethylene (PE), polypropylene (PP) and their blends have attracted a lot of attention due to their potential industrial applications. Therefore, the current work has been carried out with the main objective of investigating the impact of the thermal aging/treatment and blend ratio (composition range) on the mechanical (tensile and hardness) and thermal characteristics (using thermogravimetric analysis in a dynamic air atmosphere) of PE, PP and PE/PP binary blends. Samples of PE/PP blends containing 100/00, 75/25, 50/50, 25/75 and 0/100 wt.% were prepared via injection moulding technique and thermally treated/aged at 100°C for 0, 2, 4, 7, 14 days. The tensile measurements indicated that the yield strength and the modulus decrease with increasing PE content. It was also observed that PE, PP and their blends deform in ductile modes. They undergo a uniform yielding over a wide range of deformation, which is followed by strain hardening and then failure. The strain to break for pure PE is found to be much higher than that for pure PP and for their blends, intermediate values have been observed. The hardness measurements have also revealed that increasing PE content in PE/PP blends reduced the hardness value of PP, however, thermal aging at 100°C has not affected the polymers hardness which holds also true for the tensile properties, showing a good correlation between tested mechanical properties. The thermogravimetric analysis (TGA) in a dynamic air atmosphere and derivative thermogravimetric analysis (DTA) were conducted to study the thermal degradation and stability of thermally unaged and aged PE, PP and PE/PP blends in terms of the initial (T d and T d(1%)) and final (T d(99%)) decomposition temperatures and maximum decomposition rate temperature (T max). All polymers start to decompose at no less than 365°C. As for mechanical properties, the blend ratio has affected the thermal properties however, aging time has not.
Kinetic Analysis of the Thermal Degradation of PP—EPDM Blends
Rubber Chemistry and Technology, 2000
The thermal degradation of polypropylene (PP)/ethylene—propylene—diene rubber (EPDM) and their blends is presented. In order to evaluate the effect of the components on the thermal stability, the degradation kinetics of blends of different composition is analyzed by thermogravimetry in isothermal and constant heating rate conditions in pure nitrogen. The Flynn and Wall method is used to obtain the activation energies from the dynamic tests, while isothermal test results are used to determine the pseudo order of reaction and the shape of the ƒ(α) function which is similar to an autocatalytic type equation. Model parameters such as activation energies and pseudo order of reaction are calculated using a non-linear regression analysis. Although PP—EPDM blends are not compatible, the degradation process was not clearly characterized by two independent reactions, suggesting that both components are interacting during degradation. Moreover, the kinetic study showed that the activation ener...
Effect of CaCO3 on the Mechanical Properties of Polyethylene Terephthalate/Polypropylene Blends
Journal of Materials Science and Engineering B, 2019
The aim of this work was to study the influence of CaCO 3 in both tensile and flexural mechanical properties of a PET (polyethylene terephthalate)/PP (polypropylene). Four compositions of PET/PP/CaCO 3 blend were prepared by injection molding with CaCO 3 content of 0, 2, 4 and 6 wt%. The samples were cut according to the ASTM (American Society for Testing and Materials) standard and tested by using universal testing equipment. The results show that the mechanical properties of the PET/PP/CaCO 3 composites with 2% and 4 wt% of CaCO 3 composition were better than that of the PET/PP composites. While the content of CaCO 3 is 6 wt%, the serious phase separation between PET and PP resulted in poor mechanical properties of the PET/PP/CaCO 3 samples. This study shows that CaCO 3 has played a role to improve the tensile and flexural properties of the mixing product if it is present only in a small amount.