Study on the Morphology, Mechanical, Thermal Stability Properties of Poly(Lactic-Acid)/Poly(Ether-Block-Amide) Blends Prepared by Triple-Single Screw Extruder

2018 ◽  
Vol 783 ◽  
pp. 51-55
Author(s):  
Bin Xue ◽  
He Zhi He ◽  
Bi Da Liu ◽  
Feng Xue ◽  
Zhi Wen Zhu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Phase Interface ◽  
Poly Lactic Acid ◽  
Screw Extruder ◽  
Two Phase ◽  
Single Screw ◽  
Single Screw Extruder ◽  
The Impact ◽  
Thermal Stability Of

In this work, PLA /PEBA blends with the addition of different PEBA contents were prepared via self-made Triple-Single Screw Extruder, the phase morphology, mechanical properties thermal stability of PLA /PEBA blends with PEBA content were investigated. For the pure PLA, the tensile strength decreased, while the elongation at break and the impact strength increased significantly with addition of 15% PEBA. The which were improved nearly 23 and 5 times. The results illustrate that the soft component PEBA was beneficial to improve the tensile ductility and the toughness of PLA. SEM measurements indicate the PEBA and PLA intertwined with each other, two phases interface bond tightly, improving the compatibility of the blends when PEBA content is not more than 15 wt%, with further increasing PEBA, the two-phase interface appears and decreases the interfacial adhesion, resulting in the poor mechanical properties of blends.TG results reveal that thermal stability of PLA/PEBA blends was improved.

Thermal, mechanical, and dielectric properties of epoxy resin modified using carboxyl-terminated polybutadiene liquid rubber

2016 ◽  
Vol 49 (4) ◽  
pp. 281-297 ◽  
Author(s):  
Lina Dong ◽  
Wenying Zhou ◽  
Xuezhen Sui ◽  
Zijun Wang ◽  
Peng Wu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Dissipation Factor ◽  
Wide Frequency Range ◽  
Carboxyl Groups ◽  
Frequency Range ◽  
Two Phase ◽  
Liquid Rubber ◽  
The Impact ◽  
Thermal Stability Of

Epoxy (Ep) resin modified with carboxyl-terminated polybutadiene (CTPB) liquid rubber was investigated in this study. Fourier transform infrared verified the chemical reactions between oxirane ring of Ep and carboxyl groups of CTPB using benzyldimethylamine as a catalyst. The decrease of the thermal stability could be due to the lower thermal stability of CTPB compared with that of pure Ep. The mechanical results showed that CTPB-modified Ep was superior to that of the pure Ep, and the best overall mechanical properties were normally achieved with 20 phr of CTPB content. The impact strength of the system containing 20 phr CTPB increased by 193% due to the two-phase nature of the system. The dielectric constant and dissipation factor of the modified Ep obviously declined with the CTPB content compared with pure Ep, for instance, the dissipation factor remained less than 0.02 in wide frequency range.

Morphology and Properties of Poly(Lactic Acid)/Ethylene-Octene Copolymer Blends with Different Organoclay Types

2020 ◽  
Vol 837 ◽  
pp. 174-180
Author(s):  
Sirirat Wacharawichanant ◽  
Attachai Sriwattana ◽  
Kulaya Yaisoon ◽  
Manop Phankokkruad
Keyword(s):  
Thermal Stability ◽  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Mechanical And Thermal Properties ◽  
Two Phase ◽  
Copolymer Blends ◽  
Ethylene Octene Copolymer ◽  
Surface Modified ◽  
Thermal Stability Of ◽  
Observation Results

This work studied the morphology, mechanical and thermal properties of poly (lactic acid) (PLA)/ethylene-octene copolymer (EOC) (80/20) blends with different organoclay types. Herein, EOC was introduced to toughening PLA by melt blending and organoclay was used to improve compatibility and tensile properties of the blends. The two organoclay types were nanoclay surface modified with aminopropyltriethoxysilane 0.5-5 wt% and octadecylamine 15-35% (Clay-ASO) and nanoclay surface modified with dimethyl dialkyl (C14-C18) amine 35-45 wt% (Clay-DDA). The organoclay contents were 3, 5 and 7 phr. Scanning electron microscope (SEM) observation results revealed PLA/EOC blends demonstrated a two-phase separation of dispersed EOC phase and PLA matrix phase. The addition of organoclay significantly improved the compatibility between PLA and EOC phases due to EOC droplet size decreased dominantly in PLA matrix, so organoclay could act as an effective compatibilizer. The incorporation of organoclay increased significantly tensile strength of PLA/EOC/organoclay composites while Young’s modulus increased with 5 phr of organoclay. The thermal stability of PLA/EOC blends did not change when compared with neat PLA, and when added Clay-ASO in the blends could improve the thermal stability of the PLA/EOC blends.

Effect of a Coupling Agent on Mechanical and Biological Properties of Polyetheretherketone/Hydroxyapatite Bioactive Composite for Prosthetic Medical Device

2011 ◽  
Vol 471-472 ◽  
pp. 898-903 ◽  
Author(s):  
Ahmad Ramli Rashidi ◽  
Uzir Wahit Mat ◽  
R.A. Abdullah
Keyword(s):  
Mechanical Properties ◽  
Coupling Agent ◽  
Flexural Modulus ◽  
Biological Properties ◽  
Screw Extruder ◽  
Composite Surface ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Sbf Solution ◽  
Ceramic Hydroxyapatite

For many years, research was focused on developing a medical part of human body from polymer as to replace metal. In this study, the aim is to produce a Polyetheretherketone/Hydroxyapatite (PEEK/HA) composite which posses balance mechanical properties and good spreading of bioactive ceramic, hydroxyapatite. The composite consist of 10-30 wt% HA were compounded via nano-single screw extruder and sample for testing were produced by injection molding. Each formulation of HA was treated with (3-Aminopropyl)trimethoxysilanes coupling agent to compare with untreated HA. The result showed that the slight increasing value of Elastic modulus, flexural strength, tensile strength while decreasing flexural modulus for 10 and 20 wt% HA compared to untreated composite. The enhance of bioactivity has been proven with the incorporation of HA into PEEK. SEM-EDX image showed the bulk formation of apatite layers on the composite surface with 30 wt% HA after 3 days immersed in SBF solution. Finally, these composite be capable of being one of the biomedical part seing as the mechanical properties were found to be within the properties of human cortical and cancellous bone.

scholarly journals Effect of relative humidities on microstructural, barrier and mechanical properties of Yam starch-monoglyceride films

2009 ◽  
Vol 52 (6) ◽  
pp. 1505-1512 ◽  
Author(s):  
Fábio Avelino Bublitz Ferreira ◽  
Maria Victória Eiras Grossmann ◽  
Suzana Mali ◽  
Fábio Yamashita ◽  
Lisandro Pavie Cardoso
Keyword(s):  
Mechanical Properties ◽  
Water Vapor ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Screw Extruder ◽  
Relative Crystallinity ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Hydrophobic Compound ◽  
Starch Films

The effect of monoglyceride on microstructural, barrier and mechanical properties of casted yam starch films were investigated in different relative humidities (RH) and compared with glycerol-starch films. A single screw extruder was used to produce the starch - monoglyceride complex before film production and this process was effective to inhibit the phase separation in films. The addition of the hydrophobic compound reduced hydrophobicity, transparency and water vapor permeability of films. This later value for starch-glycerol film (1.7 x 10-10 g Pa-1 s-1 m-1) was higher than starch (1.2 x 10-10 g Pa-1 s-1 m-1) and monoglyceride-starch films (1.0 x 10-10 g Pa-1 s-1 m-1). Films containing glycerol had higher relative crystallinity (B and V H) with a slight increase at higher RH values, while for monoglyceride films, the crystallinity was constant. Monoglyceride-starch films presented poor mechanical properties when compared to glycerol- starch ones but they presented a stable behavior under different relative humidities.

scholarly journals Rigid Polyurethane Foams Reinforced with POSS-Impregnated Sugar Beet Pulp Filler

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5493
Author(s):  
Anna Strąkowska ◽  
Sylwia Członka ◽  
Agnė Kairytė
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Sugar Beet ◽  
Sugar Beet Pulp ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Limiting Oxygen Index ◽  
Composite Foams ◽  
Beet Pulp ◽  
The Impact ◽  
Thermal Stability Of

Rigid polyurethane (PUR) foams were reinforced with sugar beet pulp (BP) impregnated with Aminopropylisobutyl-polyhedral oligomeric silsesquioxanes (APIB-POSS). BP filler was incorporated into PUR at different percentages—1, 2, and 5 wt.%. The impact of BP filler on morphology features, mechanical performances, and thermal stability of PUR was examined. The results revealed that the greatest improvement in physico-mechanical properties was observed at lower concentrations (1 and 2 wt.%) of BP filler. For example, when compared with neat PUR foams, the addition of 2 wt.% of BP resulted in the formation of PUR composite foams with increased compressive strength (~12%), greater flexural strength (~12%), and better impact strength (~6%). The results of thermogravimetric analysis (TGA) revealed that, due to the good thermal stability of POSS-impregnated BP filler, the reinforced PUR composite foams were characterized by better thermal stability—for example, by increasing the content of BP filler up to 5 wt.%, the mass residue measured at 600 °C increased from 29.0 to 31.9%. Moreover, the addition of each amount of filler resulted in the improvement of fire resistance of PUR composite foams, which was determined by measuring the value of heat peak release (pHRR), total heat release (THR), total smoke release (TSR), limiting oxygen index (LOI), and the amount of carbon monoxide (CO) and carbon dioxide (CO2) released during the combustion. The greatest improvement was observed for PUR composite foams with 2 wt.% of BP filler. The results presented in the current study indicate that the addition of a proper amount of POSS-impregnated BP filler may be an effective approach to the synthesis of PUR composites with improved physico-mechanical properties. Due to the outstanding properties of PUR composite foams reinforced with POSS-impregnated BP, such developed materials may be successfully used as thermal insulation materials in the building and construction industry.

Mechanical and Interfacial Properties of Hydrolyzed Kevlar Fiber Reinforced Wood Flour/HDPE Composites

2011 ◽  
Vol 221 ◽  
pp. 27-31 ◽  
Author(s):  
Rong Xian Ou ◽  
Qing Wen Wang ◽  
Fei Pin Yuan ◽  
Bao Yu Liu ◽  
Wei Jun Yang
Keyword(s):  
Mechanical Properties ◽  
Wood Flour ◽  
Flexural Modulus ◽  
Tensile Modulus ◽  
Screw Extruder ◽  
Kevlar Fiber ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Twin Screw ◽  
Matrix Morphology

Hydrolyzed Kevlar fibers (KFs) were compouded into high-density polyethylene (HDPE) with wood flour (WF) by twin-screw/single-screw extruder to investigate the reinforcement effects of KFs on the mechanical properties of conventional WF/HDPE composites. Maleated HDPE (MAPE) was used as a compatibilizer. The mechanical properties significantly improved as the KFs loading increases in the presence of 4% MAPE, such as tensile strength 14.7%, tensile modulus 12.4%, flexural strength 22.2%, flexural modulus 22.4%, and impact strength 41.7% with 2 wt.% KFs compared to WF/HDPE composite with MAPE. The fiber matrix morphology of the interface region in the composites was examined using scanning electron microscopy (SEM).

Multifilament yarns of polyoxymethylene/poly(lactic acid) blends produced by a melt-spinning method

2019 ◽  
Vol 90 (3-4) ◽  
pp. 294-301 ◽  
Author(s):  
Weraporn Pivsa-Art ◽  
Sommai Pivsa-Art
Keyword(s):  
Lactic Acid ◽  
Phase Separation ◽  
Melt Spinning ◽  
Morphological Analysis ◽  
Poly Lactic Acid ◽  
Screw Extruder ◽  
Elongation At Break ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Multifilament Yarns

Multifilament yarns of polyoxymethylene (POM) and poly(lactic acid) (PLA) blends were prepared using a melt-spinning method. The ratios of the POM/PLA fibers studied were 10/90, 30/70, 50/50, 70/30, and 10/90 by weight compared with that of the pure polymers. The extrusion of the dry blend polymers was carried out using a single-screw extruder at 180–210℃ with a winding speed of 800 m/min. The thermal and morphological analysis of the multifilament yarn confirmed the phase separation of the two polymers. However, the mechanical properties of the blends showed excellent elongation at break, which confirmed the good distribution of PLA in the POM matrix. POM/PLA with weight ratios of 70/30 and 90/10 showed high tenacity. The elongation of the POM/PLA blends shows excellent results, which is unusual for polymer blends with phase separation.

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