Effect of Different Types of PLA on the Properties of PLA/PBAT Blown Films

2021 ◽  
Vol 885 ◽  
pp. 115-120
Author(s):  
Arianna Pietrosanto ◽  
Paola Scarfato ◽  
Luciano Di Maio ◽  
Loredana Incarnato
Keyword(s):  
Mechanical Properties ◽  
Interfacial Adhesion ◽  
Mechanical Performance ◽  
Dispersed Phase ◽  
Mass Ratio ◽  
Blown Films ◽  
Different Types

In this work, blown films made by blends of poly (lactide) (PLA) and poly (butylene-adipate-co-terephthalate) (PBAT) in a 40/60 mass ratio were developed and characterized. Two types of PLA, differing for their viscosities, were employed, in order to evaluate their effect on the morphology and on the mechanical properties of the films. The blends exhibited a coarse morphology when the viscosity of the PLA employed was much higher than PBAT. Instead, the use of a PLA whose viscosity was closer to PBAT led to a decrease of the dimensions and to a better distribution and interfacial adhesion of the dispersed phase. Moreover, the finer and more homogenous morphology of the blend resulted in better mechanical performance of the system.

Hierarchical Design and Nanomechanics of the Calcified Byssus of Anomia simplex

2009 ◽  
Vol 1187 ◽  
Author(s):  
Jakob R Eltzholtz ◽  
Marie Krogsgaard ◽  
Henrik Birkedal
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Mechanical Performance ◽  
Blue Mussel ◽  
Hierarchical Design ◽  
Reduced Modulus ◽  
Different Types ◽  
Microscopy Images ◽  
Scanning Electron

AbstractBiology has evolved several strategies for attachment of sedentary animals. In the bivalves, byssi abound and the best known example being the protein-based byssus of the blue mussel and other Mytilidae. In contrast the bivalve Anomia sp. has a single calcified thread. The byssus is hierarchical in design and contains several different types of structures as revealed by scanning electron microscopy images. The mechanical properties of the byssus are probed by nanoindentation. It is found that the mineralized part of the byssus is very stiff with a reduced modulus of about 67 GPa and a hardness of ˜3.7 GPa. This corresponds to a modulus roughly 20% smaller than that of pure calcite and a hardness that is about 20% larger than pure calcite. The results reveal the importance of microstructure on mechanical performance.

scholarly journals Evaluation of the mechanical characteristics of hygrothermally aged 2-D basalt-aramid/epoxy hybrid interply composites

2021 ◽  
Vol 2070 (1) ◽  
pp. 012234
Author(s):  
Yogeesha Pai ◽  
Dayananda Pai K ◽  
M Vijaya Kini
Keyword(s):  
Mechanical Properties ◽  
Moisture Absorption ◽  
Mechanical Performance ◽  
Mechanical Tests ◽  
Moisture Uptake ◽  
Molding Process ◽  
Micro Cracks ◽  
Different Types ◽  
Temperature Ageing ◽  
Saturation Absorption

Abstract Polymer composites used in outdoor applications are exposed to environmental factors such as temperature and moisture which may affect the mechanical performance of the composites. In this study, the influence of moisture absorption on the mechanical properties of basalt-aramid/epoxy hybrid interply composites were evaluated. Two different types hybrid interply composites were taken for the investigation namely (301 A/03 B/301 A) and (451 A/03B/451 A). Composites were prepared using compression molding process and cut specimens were subjected to three different ageing environments for 180 days. Selected ageing conditions are, (i) ambient temperature ageing (ii) Sub-zero temperature ageing (−10°C) and (iii) Humid temperature ageing (40°C and 60% Relative humidity). Mechanical tests of the aged composites were carried out to analyse the behaviour of the composites. Moisture uptake of the specimens follow Fick’s law of diffusion with saturation absorption of 5.44%, 3.12% and 1.80% for ambient, sub-zero and humid specimens respectively. Results revealed that (301 a/03 B/301 a) aged composites possess higher mechanical properties compared to (451 a/03 B/451 a) aged composites. Highest reduction in properties were observed in ambient aged specimens followed by humid and sub-zero specimens. Scanning electron microscopy (SEM) was employed to observe the damage modes of the fractured specimens. Matrix deterioration, micro cracks and fibre fracture were the major types of failures observed in aged laminates.

scholarly journals Thermal and mechanical performance of rigid polyurethane foam added with commercial nanoparticles

2017 ◽  
Vol 7 ◽  
pp. 184798041668411 ◽  
Author(s):  
Caterina Lorusso ◽  
Viviana Vergaro ◽  
Francesca Conciauro ◽  
Giuseppe Ciccarella ◽  
Paolo Maria Congedo
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
Scale Up ◽  
Polyurethane Foams ◽  
Average Cell Size ◽  
Average Cell ◽  
Rigid Polyurethane Foams ◽  
Different Types ◽  
Automotive Production ◽  
Clay Nanotubes

This study investigates the effects of commercial nanoparticles on thermal and mechanical performance of rigid polyurethane foams. Two different types of nanoparticles are considered as fillers, spherical titania and rod-shaped halloysite clay nanotubes. The aim of this study was to produce rigid polyurethane foams modified with titania nanocrystals and nanohalloysite in order to obtain polyurethanes with improved properties. The laboratory scale-up will be suitable for the production in many branches of industry, such as construction and automotive production. In particular, these foams, added with commercial nanoparticles, characterized by better thermal and mechanical properties, are mainly used in construction for thermal insulation of buildings. The fillers were dispersed in the components, bringing rates up to 10%. In these investigations, the improvement of the thermal properties occurs by adding nanoparticles in the range 4–8% of titania and halloysite. The mechanical properties instead have been observed an improvement starting from 6% of nanoparticles addition. All data are in agreement with scanning electron microscope observations that shown a decrease in the average cell size and an increase in the cell density by adding nanoparticles in foams.

Compatibilizing Modification of Polyethersulfone/Polycarbonate Blend

2013 ◽  
Vol 750-752 ◽  
pp. 858-862
Author(s):  
Cheng You Ma ◽  
Yan Mei Ma ◽  
Zhi He ◽  
Chen Yan ◽  
Dong Jiang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Thermal Properties ◽  
Block Copolymers ◽  
Interfacial Adhesion ◽  
Tensile Modulus ◽  
Ternary Blend ◽  
Dispersed Phase ◽  
Elongation At Break

Double block copolymers of polyethersulfone (PES)/polycarbonate (PC) were used as a compatibilizer for a blend of PES/PC. The morphology, thermal properties, mechanical properties, etc. of the resulting ternary blend systems were investigated. The addition of the compatibizer improved the compatibility between PES and PC. It was found that the interfacial adhesion was enhanced; the size of the dispersed phase was reduced. This resulted in an improvement of elongation at break and tenacity of PES/PC blends, while the tensile modulus slightly increased, and tensile strength was almost constant.

Mechanical Performance of Carbon Nanotube-Reinforced Nanocomposites

2015 ◽  
Vol 1110 ◽  
pp. 60-64
Author(s):  
Han Sang Kwon ◽  
Marc Leparoux ◽  
Kwang Il Hwang ◽  
Jun Ho Choi ◽  
Kwon Hoo Kim
Keyword(s):  
Mechanical Properties ◽  
Mass Production ◽  
High Performance ◽  
Mechanical Performance ◽  
Al Alloy ◽  
Alloy Matrix ◽  
Reasonable Cost ◽  
Different Types ◽  
Matrix Nanocomposites ◽  
Continuous Demand

There is a continuous demand for next-generation industrial materials because they offer advantages such as high performance, reliable life cycle, reasonable cost, and ease of mass production. Carbon nanotubes (CNTs), which possess unique properties such as beneficial mechanical, electrical, and thermal properties, as well as chemical stability, have received considerable attention as candidates for reinforcing ultra-high-performance nanocomposites. CNT-reinforced Al alloy matrix nanocomposites were fabricated by mechanical ball-milling and hot-pressing processes. The effects of different CNTs on the mechanical properties of the composites were investigated. The mechanical properties were found to change significantly depending on the type of CNT blended with the matrices. The mechanical performance of the nanocomposites can thus be controlled by using different types of CNT reinforcements.

Morphology-Property Relationships in EPDM-Polybutadiene Blends

1982 ◽  
Vol 55 (1) ◽  
pp. 151-160 ◽  
Author(s):  
Gary R. Hamed
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Interfacial Adhesion ◽  
Pure Component ◽  
Dispersed Phase ◽  
Minor Effect ◽  
Low Doses ◽  
High Doses ◽  
A Minor ◽  
Higher Doses

Abstract When mixing EPDM and BR in the Brabender a heterogeneous blend results; the dispersed phase is first sheared into fibrous strands and then broken down into micron sized particles. At low doses of irradiation, the morphology of the blend only has a minor effect on the energy to break, whereas at high doses the Eb may increase by a factor of three as the dispersed particle size is reduced from the 100 micron range. The Eb of the blend is the weight-average of the two pure components at low doses (independent of morphology), but is greater than either pure component at higher doses. Interfacial adhesion may play a key role in determining the mechanical properties in rubbery blends.

Study on the Mechanical Performance of a Ni-Based Superalloy with Trace Rare Earth Element La Additions

2012 ◽  
Vol 509 ◽  
pp. 177-181 ◽  
Author(s):  
Xiu Song ◽  
Lei Wang ◽  
Yang Liu ◽  
Hui Ping Ma
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Tensile Properties ◽  
Vickers Hardness ◽  
Earth Element ◽  
Mechanical Performance ◽  
Intermetallic Phases ◽  
Large Size ◽  
Different Types ◽  
Proof Strength

The microstructures and mechanical properties of the Ni-22Cr-14W-2Mo superalloys with various La contents have been investigated. The results indicate that the grain diameters of the alloys with different La additions are similar to that of the alloy without La. It has also been found that the Vickers Hardness of the alloys increases with the increasing of the La content form 0.000% to 0.087%. The tensile properties of the alloys can be improved by La additions, whereas the σ0.2 proof strength and the elongations of the alloys first increase and then decrease with the increasing of the La content form 0.000% to 0.087%. The alloy with 0.026% La shows the best tensile properties. This result ascribes to the different types of the La-riched phases and the different sizes of them. The La-Ni intermetallic phases with large size precipitating in the alloys have deleterious effects on the improvement of the mechanical properties, if the La content is too high.

Compatibility of Polyethersulfone/Polycarbonate Blends

2011 ◽  
Vol 217-218 ◽  
pp. 1601-1605
Author(s):  
Dong Jiang ◽  
Xiao Ran Zhang ◽  
Yan Mei Ma ◽  
Cheng You Ma
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Differential Scanning Calorimeter ◽  
Interfacial Adhesion ◽  
Random Copolymer ◽  
Dispersed Phase ◽  
Scanning Electron

polycarbonate (PC), polyethersulfone (PES) and a multi-block random copolymer of PES and PC were blended. It was found that the interfacial adhesion was enhanced, the size of the dispersed phase was reduced and PES and PC formed an interlocking structure with the copolymer, which suggest the addition of the compatibizer may improved the miscibility between PES and PC, and result in the improvement of the mechanical properties of the blends. The compatibility behavior of PES with PC was examined using differential scanning calorimeter (DSC), scanning electron microscope (SEM) and SAXS.

scholarly journals Mechanical Properties Of 3D-Structure Composites Based On Warp-Knitted Spacer Fabrics

2015 ◽  
Vol 15 (2) ◽  
pp. 127-137 ◽  
Author(s):  
Si Chen ◽  
Hai-ru Long ◽  
Ying-hao Liu ◽  
Feng-chao Hu
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
Layer Structure ◽  
Structural Parameters ◽  
3D Structure ◽  
Three Dimension ◽  
Different Types ◽  
Spacer Fabrics ◽  
Flexible Polyurethane ◽  
The Impact

Abstract In this paper, the mechanical properties (compression and impact behaviours) of three-dimension structure (3D-structure) composites based on warp-knitted spacer fabrics have been thoroughly investigated. In order to discuss the effect of fabric structural parameters on the mechanical performance of composites, six different types of warp-knitted spacer fabrics having different structural parameters (such as outer layer structure, diameter of spacer yarn, spacer yarn inclination angle and thickness) were involved for comparison study. The 3D-structure composites were fabricated based on a flexible polyurethane foam. The produced composites were characterised for compression and impact properties. The findings obtained indicate that the fabric structural parameters have strong influence on the compression and impact responses of 3D-structure composites. Additionally, the impact test carried out on the 3D-structure composites shows that the impact loads do not affect the integrity of composite structure. All the results reveal that the product exhibits promising mechanical performance and its service life can be sustained.

Weldability - Behavior of Welded Reinforcement

2019 ◽  
Vol 70 (10) ◽  
pp. 3469-3472
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Mechanical Characteristics ◽  
Mechanical Performance ◽  
Current Work ◽  
Carbon Equivalent ◽  
Work Process ◽  
Ultimate Limit

Weldability involves two aspects: welding behavior of components and safety in operation. The two aspects will be reduced to the mechanical characteristics of the elements and to the chemical composition. In the case of steel reinforcing rebar’s, it is reduces to the percentage of Cech(carbon equivalent) and to the mechanical characteristics: the yielding limit, the ultimate limit, and the elongations which after that represent the ductility class in which the re-bars is framed. The paper will present some types of steel reinforcing rebar’s with its mechanical characteristics and the welding behavior of those elements. In the current work, process-related behavior of welded reinforcement, joint local and global mechanical properties, and their correlation with behavior of normal reinforcement and also the mechanical performance resulted in this type of joints. Keywords: welding behavior, ultimate limit, reinforcing rebar’s

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