PLA-coated sisal fibre-reinforced polyester composite: Water absorption, static and dynamic mechanical properties

2018 ◽  
Vol 53 (1) ◽  
pp. 65-72 ◽  
Author(s):  
MK Gupta ◽  
Rohit Singh
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Loss Modulus ◽  
Alkali Treatment ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Static Properties ◽  
Physical Treatment ◽  
Sisal Fibre ◽  
Dynamic Mechanical

In the present work, a novel physical treatment (PLA coating) of sisal fibres and its influence on the water absorption, static and dynamic mechanical properties of its composites has been presented. The treated sisal fibres were used consisted of alkali treatment and PLA coating to fabricate its polyester-based composites by hand lay-up technique keeping constant fibres content as 20 wt.% . Water absorption analysis was carried out in terms of water uptake (%), and sorption, diffusion and permeability coefficient. In addition, static properties were examined in terms of tensile, flexural and impact test, and dynamic mechanical analysis was performed in terms of storage modulus [Formula: see text], loss modulus [Formula: see text], damping [Formula: see text] and glass transition temperature [Formula: see text]. It was reported that the PLA-coated sisal composites showed the best performance in water absorption, mechanical and dynamic mechanical properties than pure sisal and alkali-treated sisal composites. There were 33%, 49%, 48%, and 27% improvement in water resistance, tensile strength, flexural strength and impact strength, respectively, of PLA-coated sisal composites as compared to that of pure sisal composite.

scholarly journals Dynamic Mechanical Properties of Hybrid Layered Silicates/Kaolin Geopolymer Filler in Epoxy Composites

2017 ◽  
Vol 54 (3) ◽  
pp. 543-545 ◽  
Author(s):  
Yusrina Mat Daud ◽  
Kamarudin Hussin ◽  
Azlin Fazlina Osman ◽  
Che Mohd Ruzaidi Ghazali ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Speed ◽  
Hybrid Composites ◽  
Loss Modulus ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Layered Silicates ◽  
Epoxy Composites ◽  
Damping Factor ◽  
Dynamic Mechanical

Preparation epoxy based hybrid composites were involved kaolin geopolymer filler, organo-montmorillonite at 3phr by using high speed mechanical stirrer. A mechanical behaviour of neat epoxy, epoxy/organo-montmorillonite and its hybrid composites containing 1-8phr kaolin geopolymer filler was studied upon cyclic deformation (three-point flexion mode) as the temperature is varies. The analysis was determined by dynamic mechanical analysis (DMA) at frequency of 1.0Hz. The results then expressed in storage modulus (E�), loss modulus (E�) and damping factor (tan d) as function of temperature from 40 oC to 130oC. Overall results indicated that E�, E�� and Tg increased considerably by incorporating optimum 1phr kaolin geopolymer in epoxy organo-montmorillonite hybrid composites.

Thermal stability and dynamic mechanical behavior of functional multiphase boride ceramics/epoxy composites

2019 ◽  
Vol 39 (6) ◽  
pp. 508-514
Author(s):  
Yannan He ◽  
Zhiqiang Yu
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Loss Modulus ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Epoxy Composites ◽  
Scanning Calorimetry ◽  
Element Analysis ◽  
Reaction Heat ◽  
Dynamic Mechanical

Abstract The thermal and dynamic mechanical properties of epoxy composites filled with zirconium diboride/nano-alumina (ZrB2/Al2O3) multiphase particles were investigated by means of differential scanning calorimetry, dynamic thermo-mechanical analysis, and numerical simulation. ZrB2/Al2O3 particles were surface organic functional modified by γ-glycidoxypropyltrimethoxysilane for the improvement of their dispersity in epoxy matrix. The results indicated that the curing exotherm of epoxy resin decreased significantly due to the addition of ZrB2/Al2O3 multiphase particles. In comparison to the composites filled with unmodified particles, the modified multiphase particles made the corresponding filling composites exhibit lower curing reaction heat, lower loss modulus, and higher storage modulus. Generally speaking, the composites filled with 5 wt% modified multiphase particles presented the best thermal stability and thermo-mechanical properties due to the better filler-matrix interfacial compatibility and the uniform dispersity of modified particles. Finite element analysis also suggested that the introduction of modified ZrB2/Al2O3 multiphase particles increased the stiffness of the corresponding composites.

scholarly journals Enhancement of Mechanical and Dynamic Mechanical Properties of Hydrophilic Nanoclay Reinforced Polylactic Acid/Polycaprolactone/Oil Palm Mesocarp Fiber Hybrid Composites

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Chern Chiet Eng ◽  
Nor Azowa Ibrahim ◽  
Norhazlin Zainuddin ◽  
Hidayah Ariffin ◽  
Wan Md. Zin Wan Yunus ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polylactic Acid ◽  
Oil Palm ◽  
Hybrid Composites ◽  
Loss Modulus ◽  
Impact Resistance ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Dynamic Mechanical ◽  
The Fourier Transform

In previous studies, the effect of the addition of 1 wt% hydrophilic nanoclay on polylactic acid (PLA)/polycaprolactone (PCL)/oil palm mesocarp fiber (OPMF) biocomposites was investigated by tensile properties, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The current studies focus on the effect of addition of 1 wt% hydrophilic nanoclay on mechanical (flexural and impact properties) and dynamic mechanical properties of composites. The composites were characterized by the Fourier transform infrared spectroscopy (FTIR) and dynamic mechanical analysis (DMA). FTIR spectra show that peak shifting occurs when 1 wt% hydrophilic nanoclay was added to composites. The addition of 1 wt% hydrophilic nanoclay successfully improves the flexural properties and impact resistance of the biocomposites. The storage modulus of biocomposites was decreased when nanoclay was added which indicates that the stiffness of biocomposites was reduced. The loss modulus curve shows that the addition of nanoclay shift twotgin composites become closer to each other which indicates that the incorporation of nanoclay slightly compatibilizes the biocomposites. Tanδindicated that hybrid composites dissipate less energy compared to biocomposites indicate that addition of clay to biocomposites improves fiber/matrix adhesion. Water sorption test shows that the addition of nanoclay enhances water resistance of composites.

scholarly journals PMMA-Y2O3 (Eu3+) nanocomposites: Optical and mechanical properties

2011 ◽  
Vol 76 (8) ◽  
pp. 1153-1161 ◽  
Author(s):  
Salah Musbah ◽  
Vesna Radojevic ◽  
Nadezda Borna ◽  
Dusica Stojanovic ◽  
Miroslav Dramicanin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Loss Modulus ◽  
Emission Spectra ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Dynamic Mechanical ◽  
Microhardness Data ◽  
Nanoparticles Concentration ◽  
Optical And Mechanical Properties

The results of a study related to the processing and characterization of PMMA-Y2O3 (Eu3+) nanocomposites are presented herein. The nanocomposite samples were prepared using a laboratory mixing molder with different contents of Eu-ion doped Y2O3 nanophosphor powder. The influence of particle content on the optical and dynamic mechanical properties of the nanocomposites was investigated. The intensity of the luminescence emission spectra increased as the nanophosphor content in the composite increased. The results of dynamic mechanical analysis revealed that the storage modulus, loss modulus and glass transition temperature (Tg) of the polymer composites increased with increasing content of the nanophosphor powder. The microhardness data also confirmed that the hardness number increased with nanoparticles concentration in the PMMA nanocomposites. The obtained results revealed a relatively linear relationship between Tg and the Vickers hardness.

The Characteristics of Static and Dynamic Mechanical Properties of NEPE Propellant

2014 ◽  
Vol 684 ◽  
pp. 111-116
Author(s):  
Yan Bin Gao ◽  
Xiong Chen ◽  
Jin Sheng Xu ◽  
Shao Qing Hu
Keyword(s):  
Mechanical Properties ◽  
Loss Modulus ◽  
Constant Strain Rate ◽  
Viscoelastic Behavior ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Temperature Spectrum ◽  
Dynamic Mechanical ◽  
Nepe Propellant ◽  
Static Conditions

In this paper, the static and dynamic mechanical viscoelastic behavior of NEPE propellant are studied. Under static conditions, five samples were subjected to constant-strain-rate monotonic loading with five different loading rates at room temperature. The dynamic mechanical analysis was employed for measurements of temperature and frequency dependence of the NEPE propellant by mean of BOSE-DMA-ELF3200 in frequency range from 1Hz to 16Hz. And get the dynamic mechanics temperature spectrum In the low temperature region, a single relaxation is observed in loss modulus-temperature Curves, which is glass transition relaxation. The results showed that NEPE propellant showed rate dependence and the same mechanical properties in the lower temperature and higher frequency.

A Comparative Study on Dynamic Mechanical Properties of Radial and Chordwise Direction of Bamboo

2013 ◽  
Vol 838-841 ◽  
pp. 2227-2230
Author(s):  
Chun Gui Du ◽  
Ren Li ◽  
Zhe Wang ◽  
Hong Wei Yu ◽  
Chun De Jin
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Transition Temperature ◽  
Dynamic Mechanical Analysis ◽  
Radial Direction ◽  
Loss Modulus ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Dynamic Mechanical ◽  
Environment Temperature

The dynamic mechanical properties of radial and chordwise bamboo pieces were tested by dynamic mechanical analysis (DMA). The results show that the storage modulus and loss modulus and tangent delta of chordwise direction were all larger than the radial direction of bamboo; the peak of glass transition temperature of chordwise direction is high than the radial direction, and their sizes are very close; dynamic mechanical analysis can provide a reference for the optimization applicable environment temperature of curtain plybamboo.

Investigations on jute fibre-reinforced polyester composites: Effect of alkali treatment and poly(lactic acid) coating

2018 ◽  
Vol 49 (7) ◽  
pp. 923-942 ◽  
Author(s):  
MK Gupta
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Loss Modulus ◽  
Alkali Treatment ◽  
Dynamic Mechanical Properties ◽  
Poly Lactic Acid ◽  
Jute Fibre ◽  
Static Compression ◽  
Dynamic Mechanical ◽  
Polyester Composites

The aim of the present investigation is to overcome the limitations of jute fibre-reinforced polyester composite. The jute fibre-reinforced polyester composites were prepared by hand lay-up technique followed by static compression using constant fibres length 15 mm and constant fibres loading 16 wt.%. In the present work, treated jute fibres consisted of alkali treated, poly(lactic acid)-coated and alkali-treated coated with poly(lactic acid). Mechanical properties in terms of tensile, flexural and impact test, and dynamic mechanical properties in terms of storage modulus [Formula: see text], loss modulus [Formula: see text], damping [Formula: see text] and glass transition temperature [Formula: see text]of prepared composites were studied. In addition, water absorption properties in terms of percentage of water uptake and sorption, diffusion and permeability coefficient were also studied. In addition, morphological analysis of untreated and treated jute fibres and its polyester based composites was also carried out using scanning electron microscope. The results suggested that the limitations of jute fibre-reinforced polyester composites were significantly reduced after the treatment of fibres. The composite with alkali-treated jute fibres coated with poly(lactic acid) exhibited the best performance in terms of improvement in mechanical, dynamic mechanical and water resistance properties. The results obtained from present study show a successful attempt of a novel treatment.

scholarly journals MECHANICAL PROPERTIES OF THE VIET NAM SISAL FIBRE REINFORCED POLYPROPYLENE COMPOSITE

2011 ◽  
Vol 14 (2) ◽  
pp. 29-36
Author(s):  
Nieu Huu Nguyen ◽  
Binh Thanh Phan ◽  
Sau Huynh
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Loss Modulus ◽  
Flexural Modulus ◽  
Dynamic Mechanical Properties ◽  
Sisal Fiber ◽  
Sisal Fibre ◽  
Dynamic Mechanical ◽  
Sisal Fibers ◽  
The Impact

The static mechanical and dynamic mechanical properties of the treated sisal fiber reinforced polypropylene composites were improved by adding the compatiblizer PPgMA (polypropylene-grafted-maleic anghydride). The mechanical properties of the composites have been evaluated. By increasing PPgMA dosages from 2% and 3.5% by weight of PP matrix; the impact strength of the composites were significantly improved by 27% and 38%; the elongation increased by 21% and 36%; the tensile strength increased by 35% and 95%; the elastic modulus increased by 21% and 94% and the flexural modulus increased by 2% and 83% respectively. The dynamic mechanical properties (the storage modulus E’, the loss modulus E” and the loss factor tanδ) have been investigated in relation to the compatibility between the PP matrix and the treated sisal fibers. E’ and E” increased by increasing dosage of PPgMA and Tg decreased a little when increasing the contents of PPgMA. At higher temperatures, tanδ increased and at lower temperature tanδ decreased when increasing dosage of PPgMA. It is shown that PP/treated sisal fibers/PPgMA composites have shown the effects of cohesion when increasing the PPgMA. The fiber dispersion was studied by the transmission optical microscope (TOM). The morphology of the composites samples fractured by the impact strength tests have been studied using scanning electronic microscopy (SEM). The results show the improvement of the interaction forces between treated sisal fibers and PP matrix at higher levels of PPgMA.

scholarly journals Styrene–Acrylic Emulsion with “Transition Layer” for Damping Coating: Synthesis and Characterization

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1406
Author(s):  
Daoyuan Chen ◽  
Mingjin Ding ◽  
Zhixiong Huang ◽  
Yanbing Wang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Transition Layer ◽  
Testing Machine ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Latex Film ◽  
Seeded Emulsion Polymerization ◽  
Acrylic Emulsion ◽  
Dynamic Mechanical

In order to study the dynamic mechanical properties of styrene–acrylic latex with a core/shell structure, a variety of latexes were synthesized by semi-continuous seeded emulsion polymerization based on “particle design” with the same material. The latexes were characterized by rotary viscosimeter, dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), transmission electron microscope (TEM), dynamic mechanical analysis (DMA), and universal testing machine. The effects of difference at the glass transition temperature (Tg) of core and shell and the introduction of the “transition layer” on the damping and mechanical properties of latex film were studied. The results indicate that as the Tg of core and shell gets closer, the better the compatibility of core and shell, from phase separation to phase continuity. Furthermore, the introduction of the “transition layer” can effectively improve the tensile strength and tan δ (max) of the latex film. The tensile strength and maximum loss factor (f = 1 Hz) of latex with the “transition layer” increased by 36.73% and 29.11% respectively compared with the latex without the “transition layer”. This work provides a reference for the design of emulsion for damping coating.

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