scholarly journals PREPARATION OF POLYAMIDE11/BAMBOO FLOUR POLYMER COMPOSITE USING POLYVINYL ALCOHOL AS COMPATIBILIZER

2018 ◽  
Vol 56 (2A) ◽  
pp. 209-216
Author(s):  
Mai Duc Huynh
Keyword(s):  
Tensile Strength ◽  
Impact Strength ◽  
Polyvinyl Alcohol ◽  
Ethanol Solution ◽  
The Other ◽  
Step Method ◽  
Melt Mixing ◽  
Polyamide 11 ◽  
One Step ◽  
Bamboo Flour

In this work, the effects of bamboo flour (BF) and polyvinyl alcohol (PVA) contents on the tensile strength, impact strength, thermogravimetric analysis (TGA) and dynamic mechanical thermal analysis (DMTA) of polyamide 11/BF composites were studied in detail. The PVA was added into PA11/BF composites by two methods: (i) melt mixing with the other components in Haake mixer (one-step method); (ii) dispersing on the surface of BF in ethanol solution before mixing with PA11 in the melted state (two-step method). The investigation of mechanical properties showed the tensile strength of composites prepared by two-step method was higher than that of one-step method, while the trend for impact strength was opposite. On the other hand, DMTA analyses exhibited the enhacement of the compatibility of PA11/BF sample by observing the shift of peaks at the b relaxation around -80 oC due to the presence of PVA. This led to the increase of thermal stability of PA11/PVA/BF composites in comparison with PA11/BF composites. 

Effect of Dynamic Crosslinking on Mechanical Properties of PP/EPDM Blends

1993 ◽  
Vol 58 (11) ◽  
pp. 2642-2650 ◽  
Author(s):  
Zdeněk Kruliš ◽  
Ivan Fortelný ◽  
Josef Kovář
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Shear Modulus ◽  
High Impact ◽  
Necessary Condition ◽  
Step Method ◽  
Melt Mixing ◽  
One Step ◽  
High Impact Strength ◽  
Dynamic Curing

The effect of dynamic curing of PP/EPDM blends with sulfur and thiuram disulfide systems on their mechanical properties was studied. The results were interpreted using the knowledge of the formation of phase structure in the blends during their melt mixing. It was shown, that a sufficiently slow curing reaction is necessary if a high impact strength is to be obtained. Only in such case, a fine and homogeneous dispersion of elastomer can be formed, which is the necessary condition for high impact strength of the blend. Using an inhibitor of curing in the system and a one-step method of dynamic curing leads to an increase in impact strength of blends. From the comparison of shear modulus and impact strength values, it follows that, at the stiffness, the dynamically cured blends have higher impact strength than the uncured ones.

Mechanical Property Improvement of Poly(Butylene Succinate) by Reinforcing with Modified Fumed Silica

2014 ◽  
Vol 1025-1026 ◽  
pp. 215-220 ◽  
Author(s):  
Sasirada Weerasunthorn ◽  
Pranut Potiyaraj
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Impact Strength ◽  
Flexural Strength ◽  
Fumed Silica ◽  
Tensile Modulus ◽  
Silica Particles ◽  
Melt Mixing ◽  
Butylene Succinate ◽  
Ir Spectrophotometry

Fumed silica particles (SiO2) were directly added into poly (butylene succinate) (PBS) by melt mixing process. The effects of amount of fumed silica particles on mechanical properties of PBS/fumed silica composites, those are tensile strength, tensile modulus, impact strength as well as flexural strength, were investigated. It was found that the mechanical properties decreased with increasing fumed silica loading (0-3 wt%). In order to increase polymer-filler interaction, fumed silica was treated with 3-glycidyloxypropyl trimethoxysilane (GPMS), and its structure was analyzed by FT-IR spectrophotometry. The PBS/modified was found to possess better tensile strength, tensile modulus, impact strength and flexural strength that those of PBS/fumed silica composites.

scholarly journals Effects of water absorption on the mechanical properties of hybrid natural fibre/phenol formaldehyde composites

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sekar Sanjeevi ◽  
Vigneshwaran Shanmugam ◽  
Suresh Kumar ◽  
Velmurugan Ganesan ◽  
Gabriel Sas ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Impact Strength ◽  
Water Absorption ◽  
Hybrid Composites ◽  
Phenol Formaldehyde ◽  
Natural Fibre ◽  
The Other ◽  
Fibre Reinforcement ◽  
Dry Conditions

AbstractThis investigation is carried out to understand the effects of water absorption on the mechanical properties of hybrid phenol formaldehyde (PF) composite fabricated with Areca Fine Fibres (AFFs) and Calotropis Gigantea Fibre (CGF). Hybrid CGF/AFF/PF composites were manufactured using the hand layup technique at varying weight percentages of fibre reinforcement (25, 35 and 45%). Hybrid composite having 35 wt.% showed better mechanical properties (tensile strength ca. 59 MPa, flexural strength ca. 73 MPa and impact strength 1.43 kJ/m2) under wet and dry conditions as compared to the other hybrid composites. In general, the inclusion of the fibres enhanced the mechanical properties of neat PF. Increase in the fibre content increased the water absorption, however, after 120 h of immersion, all the composites attained an equilibrium state.

scholarly journals A Three-Step Method for Estimating the Mixing Height Using Ceilometer Data from the Helsinki Testbed

2012 ◽  
Vol 51 (12) ◽  
pp. 2172-2187 ◽  
Author(s):  
Noora Eresmaa ◽  
Jari Härkönen ◽  
Sylvain M. Joffre ◽  
David M. Schultz ◽  
Ari Karppinen ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Vertical Profile ◽  
The Other ◽  
Vertical Profiles ◽  
Backscattering Coefficient ◽  
Mixing Height ◽  
Step Method ◽  
Profile Method ◽  
One Step ◽  
The One

AbstractA new three-step idealized-profile method to estimate the mixing height from vertical profiles of ceilometer backscattering coefficient is developed to address the weaknesses found with such estimates that are based on the one-step idealized-profile method. This three-step idealized-profile method fits the backscattering coefficient profile of ceilometer measurements into an idealized scaled vertical profile of three error functions, thus having the potential to determine three aerosol layers (one for the surface layer, one for the mixing height, and one for the artificial layer caused by the weakened signal). This three-step idealized-profile method is tested with ceilometer and radiosounding data collected during the Helsinki Testbed campaign (2 January 2006–13 March 2007). Excluding cases with low aerosol concentration in the boundary layer, cases with clouds present, and cases with precipitation present, the resulting dataset consists of 97 simultaneous backscattering coefficient profiles and radiosoundings. The three-step method is compared with the one-step method and other commonly employed algorithms. A strong correlation (correlation coefficient r = 0.91) between the mixing heights as determined by the three-step method using ceilometer data and those determined from radiosoundings is an improvement over the same correlation using the one-step method (r = 0.28), as well as the other algorithms.

The Effects of Fiber Content in Plasticized Polyvinyl Alcohol (PVA) - Sweet Potato Peel Blends

2014 ◽  
Vol 699 ◽  
pp. 131-135
Author(s):  
Mohd Shahrul Nizam Salleh ◽  
Norzila Mohd ◽  
Zarina Omar ◽  
Sopiah Ambong Khalid ◽  
Norkamruzita Saadon ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Polyvinyl Alcohol ◽  
Sweet Potato ◽  
Interfacial Adhesion ◽  
Sem Analysis ◽  
Fiber Content ◽  
Test Results ◽  
Potato Peel ◽  
Casting Method ◽  
Melt Mixing

The effects of fiber content in sweet potato peel-plasticized polyvinyl alcohol blends were investigated. Plasticized Polyvinyl Alcohol (PPVA) was blended with Sweet Potato Peel (SPP). Prior to compounding process, PVA was plasticized with 30 phr glycerol as well as 10 phr distilled water. Blends of PPVA at composition of 80%, 70%, 60%, 50% and 40% of SPP were compounded using melt mixing equipment with an additional of 20 phr glycerol. A casting method was used to prepare the PPVA-SPP film sheet. Based on the tensile test results, PPVA with 80% SPP recorded the lowest tensile strength (5.385 MPa) as compared to blends which contain 40% SPP (13.612 MPa). The reduction of tensile strength with the addition of SPP was due to poor interfacial adhesion between the PVA and SPP which was proven by Scanning Electron Microscopy (SEM) analysis.

Mechanical Behavior of Aged Ti-15V-3Cr-3Sn-3Al Alloy

2013 ◽  
Vol 378 ◽  
pp. 82-86
Author(s):  
Ying Kai Chou ◽  
Leu Wen Tsay ◽  
Ying Chiao Wang ◽  
Chun Chen
Keyword(s):  
Tensile Strength ◽  
Mechanical Behavior ◽  
Aging Treatment ◽  
The Other ◽  
Second Step ◽  
Minor Effect ◽  
One Step ◽  
Notched Tensile Strength ◽  
The One ◽  
A Minor

The effect of aging treatments on the mechanical behavior of Ti-15V-3Cr-3Sn-3Al (Ti153) alloy was evaluated in the present study. Properties of the two-step aged specimens were also compared with those of the one-step aged specimens. The second aging treatment, which was performed at 426o°C for 24 h, apparently raised the tensile strength at the expense of the notched tensile strength for the specimens previously aged at 426°C or below. On the other hand, the second-step aging had a minor effect on further hardening of the specimens prior to aging at 538°C and 593°C. In general, theJ-integral value (fracture toughness) had the same trend as that of the notch brittleness of the specimens. Overall, the specimens subjected to the two-step aging treatment did not show any advantage over the specimens subject to one-step aging treatment.

scholarly journals Conductive thermoplastic vulcanizates based on carbon black-filled bromo-isobutylene-isoprene rubber (BIIR)/polypropylene (PP)

2021 ◽  
Vol 60 (1) ◽  
pp. 303-312
Author(s):  
Yunyun Huang ◽  
Zhi Liu ◽  
Hongyan Xu ◽  
Ruoyu Hong
Keyword(s):  
Carbon Black ◽  
Electromagnetic Interference ◽  
Emi Shielding ◽  
Step Method ◽  
Melt Mixing ◽  
Uniform Dispersion ◽  
Thermoplastic Vulcanizates ◽  
Approach Method ◽  
One Step ◽  
Isoprene Rubber

Abstract Conductive elastomer materials based on carbon black (CB) filled bromo-isobutylene-isoprene rubber (BIIR)/polypropylene (PP) thermoplastic vulcanizate (TPV) were prepared by two step method and one step method. The microstructure, mechanical properties, electrical resistivity, thermal stability, electromagnetic interference shielding performance, and fracture surface morphology of composite materials were studied. The result shows the serious aggregation of CB in one-step TPV, but the uniform dispersion of CB in two-step TPV. In addition, the two-step TPV shows a higher electromagnetic interference (EMI) shielding performance and lower conductivity penetration threshold. The penetration threshold of the two-step TPV is 9.1%, and the maximum reflection loss of the two-step TPV16 is −29.5 dB. Therefore, this research offers an uncomplicated and scalable melt mixing approach method to manufacture conductive thermoplastic vulcanizates with excellent EMI shielding.

scholarly journals STUDIES ON THE EFFECT OF ARTIFICIAL AGEING HARDNESS ON TENSILE PROPERTIES AND IMPACT STRENGTH OF AL-6SI-0.5MG-2NI ALLOY

2015 ◽  
Vol 16 (1) ◽  
Author(s):  
Abul Hossain ◽  
Abu Syedwais Kurny
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Impact Strength ◽  
Tensile Properties ◽  
The Other ◽  
Peak Hardness ◽  
Artificial Ageing ◽  
Impact Properties ◽  
Solution Treated ◽  
Standard Tests

The effect of different scheduled artificial ageing hardness on the tensile and impact properties of Al-6Si-0.5Mg-2Ni alloy was studied. The solution treated Al-6Si-0.5Mg-2Ni alloy was aged isochronally for 1 hour at temperatures up to 300oC. The precipitation stages during ageing were monitored by hardness measurements. Tensile and impact properties were determined by standard tests. During artificial ageing, the yield and ultimate tensile strength were found to increase with ageing hardness; the maximum being attained at peak hardness. Ductility and impact toughness of the alloy, on the other hand decreased with ageing hardness, reaching the minimum at the highest hardness. The strength of Al- 6Si-0.5Mg-2Ni alloy was best at highest hardness but exhibits poor ductility and impact strength. KEYWORDS: Al-6Si-0.5Mg-2Ni alloy; ageing; hardness; tensile properties; impact strength;

scholarly journals Studying the effect of silica (SiO2) addition on the adhesive properties of polyvinyl alcohol

2019 ◽  
Vol 14 (29) ◽  
pp. 107-124
Author(s):  
Nahida J. Hameed
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Shear Strength ◽  
Polyvinyl Alcohol ◽  
The Other ◽  
Casting Method ◽  
Adhesive Properties ◽  
Adhesive Material ◽  
Vulcanized Rubber ◽  
Adhesive Characteristic

The work concerned with studying the effect of (SiO2) addition as afiller on the adhesive properties of (PVA). Samples were prepared assheets by using casting method. The mechanical properties showedthat increase in tensile strength from (34MPa) to (68MPa) when(SiO2) added to (PVA). The adhesive strength showed that jointproperties depend upon specific adhesive characteristic of material(PVA) and (SiO2\PVA)composites at different concentrations (1.5%,2.5%, 3.5%, 4.5wt%), the cohesive strength of the adhesive material,the joint design, and adherent type (Sponge Rubber(SR), Naturalleather (NL), Vulcanized Rubber(VR), and Cartoon). The resultsproved the tensile strength increased with (SiO2) ratio, so it can beused as the adhesive material. Shear strength showed an increasewith (SiO2) ratio of sponge rubber, and cartoon adherent, whereas itwas increased up to 2.5% for Natural Leather, and VulcanizedRubber then decreased; That suggested it is most suitable for spongerubber adhesive and cartoon than the other adherents.

Preparation and selective laser sintering of bamboo flour/copolyester composite and post-processing

2015 ◽  
Vol 30 (8) ◽  
pp. 1045-1055 ◽  
Author(s):  
Dejin Zhao ◽  
Yanling Guo ◽  
Kaiyi Jiang ◽  
Hui Zhang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Impact Strength ◽  
Selective Laser Sintering ◽  
Single Layer ◽  
Processing Parameters ◽  
Laser Sintering ◽  
Post Processing ◽  
New Type ◽  
Bamboo Flour

A new type of biocomposite, bamboo flour/copolyester (BFCP) composite for selective laser sintering (SLS™) was studied in this article. The bamboo flour was made from the bamboo residual of the bamboo production collected from a chopsticks factory. The BFCP composites of three mixture ratios (20/80, 25/75, and 30/70 (wt/wt)) were processed by SLS™. The proper processing parameters were determined by single-layer sintering methods. The mechanical properties of test specimens made from BFCP composites of three mixture ratios have been investigated. The results demonstrated that the mechanical properties of the specimens made by BFCP composite of 20/80 (wt/wt) were the best among those of the three mixture ratios and the average tensile strength, flexural strength, and impact strength of the specimens made from BFCP composite of 20/80 (wt/wt) were up to 4.14 MPa, 11.02 MPa, and 0.84 kJ m−2, respectively. The mechanical properties of specimens are extremely improved through infiltrating epoxy resin.

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