scholarly journals Biodegradable Blends of Thermoplastic Waxy Starch and Poly(ε-caprolactone) Obtained by High Shear Extrusion: Rheological, Mechanical, Morphological and Thermal Properties

2021 ◽  
Author(s):  
Anderson F. Manoel ◽  
Pedro Claro ◽  
Luiz H. C. Mattoso ◽  
Jose M. Marconcini ◽  
Gerson L. Mantovani
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Thermal Analysis ◽  
Thermal Properties ◽  
Polymer Blends ◽  
High Shear ◽  
Biodegradable Material ◽  
Waxy Starch ◽  
Thermal Stability Of ◽  
Biodegradable Blends

Abstract The aim of this work was to develop polymer blends of plasticized thermoplastic waxy starch (TPS) and poly(ɛ-caprolactone) (PCL) using the largest amount of TPS possible to obtain a biodegradable material motivated by sustainability issues and to replace petrochemical-based polymers with alternatives based on biopolymers. Addition of TPS to other polymers has been used to obtain cheaper and increasingly biodegradable final products. However, TPS presents limited mechanical properties, and mixing with other polymers such as PCL is necessary to overcome these limitations and improve its processability. TPS was processed by extrusion and thermo-compression using 30 wt% glycerol. The blends were suitably processed by extrusion and further injected. The TPS/PCL blends were studied by varying the amount of PCL in a range of 10 wt% in increasing order of addition. Thermal analysis showed that introducing PCL in TPS increased Tonset because of the higher thermal stability of the former, and that the obtained blends presented a behavior intermediate to that of neat polymers.

scholarly journals Investigation the effect of Graphene on The Morphology, Mechanical and Thermal properties of PLA/PMMA Blends

2015 ◽  
Vol 37 ◽  
pp. 15 ◽  
Author(s):  
Azin Paydayesh ◽  
Ahmad Aref Azar ◽  
Azam Jalali Arani
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Thermal Analysis ◽  
Thermal Properties ◽  
Poly Lactic Acid ◽  
Mechanical And Thermal Properties ◽  
Elongation At Break ◽  
Blend Morphology ◽  
Pmma Blends ◽  
Thermal Stability Of

In this work, Poly Lactic Acid/Poly methyl Methacrylate (PLA/PMMA) blends in various compositions prepared and morphology and properties of these blends was investigated. Moreover, the effect of adding different amounts of Graphene Nanoplatelets (GNP) on the morphology of the blends (by SEM), the interaction of nanopalates with polymer phases (by FTIR) and its effect on the mechanical properties and thermal stability of the samples were examined. The results of the study showed that in different amounts of graphene, these plates were preferentially located in the polymer phases dissimilarly and thus, caused the change of the blend morphology. In addition, measuring the mechanical properties by tensile test and results of thermal analysis by TGA indicated the improvement of thermal stability, modulus and mechanical strength and reduction of the elongation at break of graphene containing blends with increasing the loading of GNP. The changing behavior of the mechanical and thermal properties was proportional to the Graphene localization in blend phases.

scholarly journals Mechanical and Thermal Properties of Montmorillonite-Reinforced Polypropylene/Rice Husk Hybrid Nanocomposites

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1557 ◽  
Author(s):  
Khaliq Majeed ◽  
Ashfaq Ahmed ◽  
Muhammad Saifullah Abu Bakar ◽  
Teuku Meurah Indra Mahlia ◽  
Naheed Saba ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Thermal Properties ◽  
Rice Husk ◽  
Hybrid Nanocomposites ◽  
Commercial Application ◽  
Mechanical And Thermal Properties ◽  
Melt Mixing ◽  
Compatibilizing Agent ◽  
Thermal Stability Of

In recent years, there has been considerable interest in the use of natural fibers as potential reinforcing fillers in polymer composites despite their hydrophilicity, which limits their widespread commercial application. The present study explored the fabrication of nanocomposites by melt mixing, using an internal mixer followed by a compression molding technique, and incorporating rice husk (RH) as a renewable natural filler, montmorillonite (MMT) nanoclay as water-resistant reinforcing nanoparticles, and polypropylene-grafted maleic anhydride (PP-g-MAH) as a compatibilizing agent. To correlate the effect of MMT delamination and MMT/RH dispersion in the composites, the mechanical and thermal properties of the composites were studied. XRD analysis revealed delamination of MMT platelets due to an increase in their interlayer spacing, and SEM micrographs indicated improved dispersion of the filler(s) from the use of compatibilizers. The mechanical properties were improved by the incorporation of MMT into the PP/RH system and the reinforcing effect was remarkable as a result of the use of compatibilizing agent. Prolonged water exposure of the prepared samples decreased their tensile and flexural properties. Interestingly, the maximum decrease was observed for PP/RH composites and the minimum was for MMT-reinforced and PP-g-MAH-compatibilized PP/RH composites. DSC results revealed an increase in crystallinity with the addition of filler(s), while the melting and crystallization temperatures remained unaltered. TGA revealed that MMT addition and its delamination in the composite systems improved the thermal stability of the developed nanocomposites. Overall, we conclude that MMT nanoclay is an effective water-resistant reinforcing nanoparticle that enhances the durability, mechanical properties, and thermal stability of composites.

scholarly journals Thermal Behavior of Insulation Fiberboards Made from MDF and Paper Wastes

2021 ◽  
Vol 72 (3) ◽  
pp. 245-254
Author(s):  
Bita Moezzipour ◽  
Aida Moezzipour
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Thermal Stability ◽  
Thermal Analysis ◽  
Fire Resistance ◽  
Dimensional Stability ◽  
Raw Materials ◽  
Waste Paper ◽  
Recycled Fibers ◽  
Thermal Stability Of

Today, recycling is becoming increasingly important. In recycling process, the product performance should also be considered. In this study, manufacturing insulation fiberboard, as a practical wood product from recycled fibers, was investigated. For this purpose, two types of waste (MDF wastes and waste paper) were recycled to fibers and used for producing insulation fiberboards. The target fiberboard density was 0.3 g/cm3. The ratio of waste paper to MDF waste recycled fibers (WP/RF) was considered at two levels of 70/30 and 50/50. Polyvinyl acetate adhesive was used as a variable in the board manufacturing process. The mechanical properties, dimensional stability, thermal conductivity, and fire resistance of the boards were evaluated. Besides, the thermal stability of fiberboards was studied using thermal analysis including thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The results showed that the insulation fiberboards had admissible mechanical properties and dimensional stability. The manufactured boards displayed low thermal conductivity, which proved to be well competitive with other insulation materials. The fiberboards manufactured with PVAc adhesive and WP/RF ratio of 50/50 had higher fire resistance compared to other treatments. Additionally, results of thermal analysis showed that the use of PVAc adhesive and WP/RF ratio of 50/50 leads to improved thermal stability. Overall, the recycled fibers from MDF and paper wastes appear to be appropriate raw materials for manufacturing thermal insulation panels, and use of PVAc adhesive can significantly improve thermal and practical properties of insulation fiberboards.

scholarly journals Thermal Analysis of Oil Shale Ash-filled High-density Polyethylene Composites

2021 ◽  
pp. 59-65
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Thermal Properties ◽  
Polymer Composite ◽  
High Density Polyethylene ◽  
Oil Shale ◽  
Neat Polymer ◽  
Oil Shale Ash ◽  
Shale Ash ◽  
Thermal Stability Of

Thermal analysis was performed to evaluate the impact of the addition of oil shale ash (OSA) to high-density polyethylene (HDPE) polymer matrix using differential scanning calorimetry (DSC) and thermo-gravimetric analysis (TGA). Extrusion and press molding processes were used to compound the OSA-filled HDPE polymer composites containing 0, 5, 15 and 25 wt% OSA, for which the thermal properties and the characteristics of the composites were studied. Investigation of the thermal properties of the OSA-HDPE composite is necessary for selecting processing conditions and the appropriate application field. The DSC results demonstrated that OSA addition only marginally affected the glass transition temperature Tg of the composite formulations. The melting temperature Tm showed a decreasing trend with increased OSA fraction, while the crystallization temperature Tcryst showed an increasing trend. The heat of fusion ∆Hm, the heat of crystallization ∆Hcryst and the percentage of crystallinity decreased on the addition of OSA filler. The TGA results demonstrated that the thermal stability of the polymer composite matches that of the neat polymer behavior up to 350 °C after which the thermal stability of the filled polymer composite increases with increased filler content. Above 360 °C, the weight loss of the neat polymer as well as of the polymer composite is accelerated up to 480 °C where all tested samples become fully degraded.

Thermal Stability of an Epoxy Adhesive

2014 ◽  
Vol 1053 ◽  
pp. 257-262
Author(s):  
Mei Li ◽  
Xiang Yu Zhao ◽  
Wei Shao ◽  
Chuan Bao Ma ◽  
Rui Xue Zheng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Thermal Properties ◽  
Epoxy Adhesive ◽  
Inert Gas ◽  
Curing Agent ◽  
Pure Epoxy ◽  
Different Levels ◽  
Thermal Stability Of ◽  
Better Than

An epoxy adhesive and its curing agent are tested using differential scaning calorimetry under different atmospheres and after different exposure times to natural air to analyze its thermal properties. The results show that after the pure epoxy, the curing agent and the adhesive mixture of them are exposed in natural air for different period of time, all show different levels of decline in thermal stability and more complicated reactions when tested in the DSC and TGA in O2 and air, while the thermal properties remain stable when they are tested in an inert gas like N2. And according to the mechanical property tests and SEM results, the mechanical properties of the adhesive mixture in N2 are better than that in air. The results indicate that inert gas can protect the property of this kind of adhesive and thus increase its bond strength.

Effect of Blend Ratio on the Mechanical and Thermal Properties of Polyurethane/Silicone Rubber Conductive Material

2018 ◽  
Vol 280 ◽  
pp. 264-269
Author(s):  
Heng Chun Wei ◽  
Teh Pei Leng ◽  
Yeoh Chow Keat
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Thermal Properties ◽  
Silicone Rubber ◽  
Conductive Filler ◽  
Material Testing ◽  
Testing System ◽  
Mechanical And Thermal Properties ◽  
Blend Ratio ◽  
Thermal Stability Of

This work reports on mechanical and thermal properties of a novel polymer blend. Blends were prepared by mixing silicone rubber with diphenyl – 4,4 – dissocyanate in different ratios. Graphene nanoplatelets was added as conductive filler to improve the electrical conductivity of the blends. The mechanical properties, including tensile and tear performances were measured by a material testing system. The thermal stability of the blends was measured by thermogravimetric analysis. Incorporation 20 vol.% of silicone rubber can help to improve the thermal stability of the blend, meanwhile optimum mechanical properties of the blends is achieved.

scholarly journals Aggregation and thermal properties of nanostructured montmorillonite covered with mixed adsorption layers of cationic polyacrylamide and hazardous lead(II) ions

2020 ◽  
Vol 10 (12) ◽  
pp. 5499-5510
Author(s):  
Małgorzata Wiśniewska ◽  
Gracja Fijałkowska ◽  
Katarzyna Szewczuk-Karpisz ◽  
Dariusz Sternik
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Heavy Metal ◽  
Thermal Properties ◽  
Chemical Nature ◽  
Solid Particles ◽  
Cationic Polyacrylamide ◽  
Low Concentrations ◽  
Adsorption Layers ◽  
Thermal Stability Of

AbstractThe aim of the study was to investigate the influence of nanostructured montmorillonite surface modification by the cationic polyacrylamide and the lead(II) ions on the thermal and aggregation properties of solid particles covered with mixed adsorption layers. The effects of cationic groups content in the polymeric macromolecules, the order of individual adsorbates addition, and lead(II) ions concentration were determined. Using spectrophotometry, potentiometric titration, microelectrophoresis, turbidimetry, DCS (Differential Centrifugal Sedimentation) and thermal analysis methods, the adsorption, electrokinetic, aggregation properties, as well as the thermal stability of studied montmorillonite—CT PAM—Pb(II) systems were established. It was shown that applied polymeric substance (soil flocculant) causes accumulation of lead(II) ions, which are hazardous at very low concentrations. Nevertheless, the chemical nature of these interactions may limit the bioavailability of this heavy metal for plants.

scholarly journals Role of different lignin systems in polymers: mechanical properties and thermal stability

2020 ◽  
Vol 22 (4) ◽  
pp. 10-16
Author(s):  
Gvlmira Hasan ◽  
Dilhumar Musajan ◽  
Gong-bo Hou ◽  
Mingyu He ◽  
Ying Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Induction Time ◽  
Crystallization Rate ◽  
Scanning Calorimetry ◽  
Oxidation Induction Time ◽  
Thermal Stability Of

AbstractLignin was used to study the mechanical properties and thermal stability of polymers. The lignin was blended with three kinds of polymers, and the addition of lignin was 0.5 wt%. Under the condition of thermal oxidation, the thermal stability of lignin/polymer samples varies with the structure of lignin. The effects of lignin on the mechanical properties and thermal stability of the polymers were investigated by oxidation induction time (OIT), rheological properties, mechanical properties and differential scanning calorimetry (DSC). The results show that the effect of lignin on the thermal properties of polymer samples is 2~3°C. It can be inferred that lignin can effectively improve the interaction between polymer molecular chain segments, and improve the crystallization rate and rigidity to a certain extent, so it can be seen that lignin has good compatibility and thermal stability.

scholarly journals Preparation of poly(MPAEMA)/halloysite Nanocomposites and Investigation of Antiproliferative Activity

2021 ◽  
Vol 65 (2) ◽  
Author(s):  
Nevin Çankaya ◽  
Serap Yalçın ◽  
Nevin Turan
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Thermal Properties ◽  
Cytotoxic Effect ◽  
In Situ Polymerization ◽  
Clay Content ◽  
Xtt Assay ◽  
Research Areas ◽  
Thermal Stability Of

Abstract. In this present work, the synthesis, characterization, and thermal properties of poly(2-(4-methoxyphenylamino)-2-oxoethyl methacrylate) (MPAEMA) polymer/clay-based nanocomposites were investigated by in-situ polymerization. At the characterizations of nanomaterials FTIR, XRD, SEM, and TGA techniques were used. It was determined from XRD and SEM measurements that the morphology of nanocomposites was exfoliated when the clay content in the polymer matrix was kept at 3% and 5%. From thermal analysis, a positive correlation was observed between the clay ratio and thermal stability of nanomaterials. Also, the cytotoxic effect of halloysite and its nanocomposites was investigated using XTT assay on HeLa cells. According to the results, nanocomposites showed a non-cytotoxic response and thus they may use safety in many research areas such as medicine, agriculture, cosmetics.   Resumen. En este trabajo, se reporta la síntesis, caracterización y propiedades térmicas de nanocompuestos de polímero / arcilla poli(2-(4-metoxifenilamino)-2-oxoetil metacrilato) (MPAEMA), obtenidos mediante polimerización in situ. Para caracterizar los nanomateriales se utilizaron las siguientes técnicas: FTIR, XRD, SEM y TGA. A partir de las mediciones de XRD y SEM se determinó que la morfología de los nanocompuestos muestra exfoliación, cuando el contenido de arcilla en la matriz de polímero se mantiene en 3% y 5%. Estudios mediante análisis térmico muestran una correlación positiva entre la relación de arcilla y la estabilidad térmica de los nanomateriales. También se investigó el efecto citotóxico de la halloysita y sus nanocompuestos utilizando el ensayo XTT en células HeLa. Los resultados muestran que los nanocompuestos tienen una respuesta no citotóxica y, por lo tanto, pueden utilizarse con seguridad en muchas áreas de investigación en disciplinas como la medicina, la agricultura y la cosmética.

Sign in / Sign up

Export Citation Format

Share Document