scholarly journals Improved viscoelastic, thermal, and mechanical properties of in situ microfibrillar polypropylene/polyamide 6,6 composites via direct extrusion using a triple-screw extruder

RSC Advances ◽  
2017 ◽  
Vol 7 (9) ◽  
pp. 5030-5038 ◽  
Author(s):  
Ying Huang ◽  
Yadong He ◽  
Weidan Ding ◽  
Kunxiao Yang ◽  
Dongquan Yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal And Mechanical Properties ◽  
Screw Extruder ◽  
Direct Extrusion

Improved viscoelastic, thermal, and mechanical properties ofin situmicrofibrillar polypropylene/polyamide 6,6 compositesviadirect extrusion using a triple-screw extruder.

scholarly journals Hybrid Fly Ash-Based Geopolymeric Foams: Microstructural, Thermal and Mechanical Properties

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2919 ◽  
Author(s):  
Giuseppina Roviello ◽  
Laura Ricciotti ◽  
Antonio Jacopo Molino ◽  
Costantino Menna ◽  
Claudio Ferone ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Circular Economy ◽  
Coal Fly Ash ◽  
Silicate Solution ◽  
Thermal And Mechanical Properties ◽  
Blowing Agent ◽  
Materials Used

This research investigates the preparation and characterization of new organic–inorganic geopolymeric foams obtained by simultaneously reacting coal fly ash and an alkali silicate solution with polysiloxane oligomers. Foaming was realized in situ using Si0 as a blowing agent. Samples with density ranging from 0.3 to 0.7 g/cm3 that show good mechanical properties (with compressive strength up to ≈5 MPa for a density of 0.7 g/cm3) along with thermal performances (λ = 0.145 ± 0.001 W/m·K for the foamed sample with density 0.330 g/cm3) comparable to commercial lightweight materials used in the field of thermal insulation were prepared. Since these foams were obtained by valorizing waste byproducts, they could be considered as low environmental impact materials and, hence, with promising perspectives towards the circular economy.

Morphological, Thermal and Mechanical Properties of Poly(Lactic Acid)/Cellulose/ Nano-Clay Composite

2020 ◽  
Vol 856 ◽  
pp. 331-338
Author(s):  
Sirisart Ouajai ◽  
Suttinun Phongtamrug
Keyword(s):  
Mechanical Properties ◽  
Flexural Modulus ◽  
Poly Lactic Acid ◽  
Thermal And Mechanical Properties ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Chemically Modified ◽  
Nano Clay ◽  
Twin Screw ◽  
Modified Cellulose

This research has focused on the effect of modified cellulose and clay on the thermal and mechanical properties of PLA bio-nanocomposite. Cellulose was chemically modified with silane coupling agent in order to enhance compatiblization with PLA. Successful modification was confirmed by Fourier Transform Infrared Spectroscopy and EDX-SEM. PLA was compounded with various amounts and ratios of the modified cellulose and clay by a twin-screw extruder. Thermal properties of the bio-nanocomposites were characterized by Thermogravimetric Analysis and Differential Scanning Calorimetry. Glass transition temperature of the bio-nanocomposite slightly decreased whereas melting temperature remained constant when the amount of both fillers was increased. In addition, crystallization behaviour of PLA has been influenced by the type and amount of the fillers. Clay showed a greater effect on the crystallization of PLA than the modified cellulose and unmodified one, respectively. The flexural modulus of the composite containing equal amount between clay and cellulose was increased with an increasing in fillers contents. But the flexural and impact strength of composite were gradually decreased with an increase in fillers contents. Variation of clay and cellulose ratio resulted in the change of mechanical properties. The composite containing higher ratio between clay:cellulose or cellulose:clay showed a better mechnical properties comparing to the ratio of clay:cellulose equal to 1:1.

Influencing on Structure and Mechanical Properties of PA6/PP Blends for Different Graft Yield Compatibilizer

2011 ◽  
Vol 189-193 ◽  
pp. 533-536 ◽  
Author(s):  
Jia Min Zhang ◽  
Ming Yi Zhu ◽  
Zhao Xun Lian ◽  
Rong Zhu
Keyword(s):  
Mechanical Properties ◽  
High Rate ◽  
Graft Material ◽  
Screw Extruder ◽  
Melt Flow Rate ◽  
Melt Grafting ◽  
Twin Screw ◽  
Graft Yield ◽  
Pp Blends

With the melt grafting method using styrene (St) as co-monomer to maleic anhydride (MAH)，the VERSIFY (V ethylene-propylene copolymer of the content of ethylene is 12%) was grafted. Different graft yield materials, V-g-(MAH-co-St) (g-V) were obtained. Nylon 6 (PA6)/ PP blends were prepared using twin-screw extruder. Using MFR, SEM, IR and mechanical properties testing analysis methods, morphology and mechanical properties of PA6/PP blends were studying on the different graft yield g-V. The results showed with increasing the graft yield, the minimum melt flow rate decreased and the size of the PP dispersed phase became smaller and more uniform. The addition of taller graft yield materials remarkably improved that the anhydride group in g-V reacted with the amine end groups of the PA6, and PP-PA6 copolymers were formed in situ, which effectively improved the compatibility between PP and PA6. The size of PP domains in the PA6 matrix was significantly reduced. Multi-monomer melt grafting can obtain a high rate of graft material. From the MAH: St = 0.5 to the MAH: St = 1, the grafting yield increased significantly. Continuing to improve MAH: St ratio, the magnitude of changes of graft yield of grafting decreases. Different grafting yield of multi-monomer g-V toughened PA6, a high rate of graft effect was good.

Thermal and mechanical properties of in situ polymerized PS/EPDM blends

2006 ◽  
Vol 42 (10) ◽  
pp. 2632-2645 ◽  
Author(s):  
Emerson Lourenço ◽  
Maria Isabel Felisberti
Keyword(s):  
Mechanical Properties ◽  
Thermal And Mechanical Properties

scholarly journals Thermal and Mechanical Properties of Microporous Polyurethanes Modified with Reduced Graphene Oxide

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Michał Strankowski ◽  
Damian Włodarczyk ◽  
Łukasz Piszczyk ◽  
Justyna Strankowska
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Degradation Rate ◽  
Thermal Characteristics ◽  
Functional Materials ◽  
Point Of View ◽  
Thermal And Mechanical Properties ◽  
Reduced Graphene

Microporous polyurethanes (MPU) were modified by adding 0.25%–1.25 wt% of reduced graphene oxide (RGO). The materials were prepared without solvent viain situpolymerization. From a technological point of view, it is very important to obtain functional materials by using reacting compounds only. The thermal characteristics of obtained MPU were investigated using TGA, DSC, and DMA techniques. In comparison to nonmodified microporous polyurethane, the thermal stability and mechanical properties of the modified systems have significantly improved. The temperature corresponding to the maximum degradation rate (Tmax) for nanocomposites containing 1% and 1.25 wt% of RGO was 51°C higher than that observed for pure microporous PU system. The increase of tensile strength was also observed for matrix with the addition of 0.5 wt% RGO nanofiller.

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