Effects of Hard Segment Contents on Dynamic Mechanical Properties of Gap-Based Polyurethane Elastomers

2013 ◽  
Vol 376 ◽  
pp. 125-129
Author(s):  
Hai Qin Ding ◽  
Le Qin Xiao ◽  
Wei Liang Zhou ◽  
Li Rong He ◽  
Huai Long Zhang
Keyword(s):  
Mechanical Properties ◽  
Hard Segment ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Polyurethane Elastomers ◽  
Elongation At Break ◽  
Dynamic Mechanical ◽  
Soft Segments ◽  
Hard Segments ◽  
Fragility Parameter

Gap-based polyurethane elastomer (GAPE) with different hard segment contents are synthesized with 44-Diphenylmethane diisocyanate (MDI), 1,4 butylene glycol (BDO) as hard segments and GAP as soft segments. Dynamic mechanical analysis (DMA) is applied to investigated the dynamic mechanical properties and the mechanical properties of GAPE are studied by materials laboratorial instrument. The results show that GAPE-2 with 33 wt% hard segment has better mechanical properties, of which the tensile strength is 11.3MPa and elongation at break is 460.5%.As shown in DMA, T g of GAPE-2 is-18.4°C, and the low-temperature fragility parameter and activation energy of GAPE-2 are lower, 55.6 and 271.0 KJ·mol-1 respectively. Elastomer with good stiffness and flexibility is obtained.

Influence of Diisocyanates on Dynamic Mechanical Properties of Castable Polyurethane Elastomers

2012 ◽  
Vol 217-219 ◽  
pp. 563-566
Author(s):  
Xiao Dong Chen ◽  
Yu Hua Yi
Keyword(s):  
Mechanical Properties ◽  
Dynamic Mechanical Analysis ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Toluene Diisocyanate ◽  
Diphenylmethane Diisocyanate ◽  
Analysis Method ◽  
Polyurethane Elastomers ◽  
Dynamic Mechanical ◽  
Soft Segments

A series of castable polyurethane elastomers, based on polytetramethylene glycol as soft segments and toluene diisocyanate, 4, 4’-diphenylmethane diisocyanate, P-phenylene diisocyanate as diisocyanates respectively, were synthesized. The dynamic mechanical analysis method was utilized to determine tan delta property (tanδ). Also the influence of diisocyanates on the dynamic mechanical properties of castable polyurethane elastomers was analyzed. It can be concluded that the P-phenylene diisocyanate system elastomers have the most excellent dynamic mechanical properties.

Mechanical and Dynamic Mechanical Properties of Degradable Polyurethane Foams with PEG/PCL Mixed Soft Segments

2011 ◽  
Vol 183-185 ◽  
pp. 1611-1615 ◽  
Author(s):  
Jian Hua Wang ◽  
Shuen Liang ◽  
Yan Yan Wang ◽  
Chun Rong Tian ◽  
Xiu Li Zhao
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Tensile Strength ◽  
Compressive Strain ◽  
Dynamic Mechanical Properties ◽  
Polyurethane Foams ◽  
Elongation At Break ◽  
Dynamic Mechanical ◽  
Soft Segments ◽  
And Storage

Polyurethane (PU) with mixed poly(ethylene glycol) / poly(ε-caprolactone) (PEG/PCL) soft segments is a representatively kind of degradable polyurethane material. Polyurethane foams (PUF) with mixed PEG/PCL soft segments were synthesized by using one pot method, and their mechanical and dynamic mechanical properties were investigated. Influences of PEG/PCL weight ratio and molecular weight of soft segments on PUF's mechanical and dynamic mechanical properties were studied. The results showed that: with increasing content of PCL, PUF's tensile strength, elongation at break, stress at certain tensile/compressive strain and storage modulus increased gradually; with increasing molecular weight of soft segment, PUF's elongation at break increased, but tensile strength, stress at certain tensile/compressive strain and storage modulus all decreased accordingly; glass transition temperature (Tg) of PUF with various soft segments decreased according to the following sequence: PEG-400, PCL-210N, PEG-1000 and PTMG1000; loss factor of PUF with PEG/PCL mixed soft segments was higher than that of PUF with individual PEG or PCL soft segments.

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.

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.

Study of Utilization of Ground EVA Waste as Filler in NBR Vulcanizates

2002 ◽  
Vol 10 (5) ◽  
pp. 381-390 ◽  
Author(s):  
Viviane Xavier Moreira ◽  
Bluma Guenther Soares
Keyword(s):  
Mechanical Properties ◽  
Ethylene Vinyl Acetate ◽  
Dynamic Mechanical Properties ◽  
Elongation At Break ◽  
Rubber Blends ◽  
Dynamic Mechanical ◽  
Footwear Industry ◽  
Wide Range ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

Rubber blends containing nitrile rubber (NBR) and ground ethylene-vinyl acetate copolymer waste (EVAW) from the footwear industry have been prepared over a wide range of composition (up to 90 phr of waste component). The ground EVAW had particle size in the range of 100-350 mm and a gel content of 60±5%. The effect of different amounts of EVA waste on the tensile strength, elongation at break, hardness, tear strength and dynamic mechanical properties was studied. EVAW had a good reinforcing effect on the NBR matrix. A combination of optimum tensile properties, resistance to solvent penetration and dynamic mechanical properties, such as storage modulus and loss tangent was achieved by introducing 50 phr of EVAW in the NBR matrix. This composition also presents a more uniform morphology, as indicated by scanning electron microscopy.

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 Study on dynamic mechanical properties of a nylon-like polyester tire cord

2019 ◽  
Vol 14 ◽  
pp. 155892501986880 ◽  
Author(s):  
Liyong Tian ◽  
Di Wang ◽  
Qufu Wei
Keyword(s):  
Mechanical Properties ◽  
Complex Modulus ◽  
Nylon 6 ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Vital Role ◽  
Tire Cord ◽  
Synthetic Fibers ◽  
Dynamic Mechanical ◽  
Polyester Cord

Tires might be the first technically significant composite out of rubber and play a vital role in the overall performance of a car. The essential functions of a tire rely to a great extent on the properties of tire cords. Polyester and nylon cords make up the majority of synthetic fibers used in tires. A new kind of polyester cord has been developed combining the performance characteristics of both polyester and nylon cords. This article examines the dynamic mechanical properties of this nylon-like polyester tire cord by adopting dynamic mechanical analysis, Instron, and DISC fatigue experiments, as well as its dynamic adhesion property using flex fatigue experiment. It demonstrated that the dynamic complex modulus of the nylon-like polyester cord was higher than that of nylon 6 cord but lower than that of standard polyester cord, which was a favorable characteristic when it came to replacing nylon 6 cord with nylon-like polyester cord in tires. Under cyclic loading, hysteresis loss of nylon 6 cord > nylon 66 cord > nylon-like polyester cord > standard polyester cord was observed. In the DISC experiment, nylon-like polyester had a similar compression resistance property to that of nylon 6 cord. At a temperature below 85°C, nylon-like polyester cord maintained roughly the same level of residual ratio of dynamic adhesion, but beyond this temperature point, nylon 6 exhibited a better performance.

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.

Preparation and Mechanical Properties of Poly (arylene sulfide sulfone)/Glass Fiber Cloth Composites

2015 ◽  
Vol 815 ◽  
pp. 496-502
Author(s):  
Yu Kong ◽  
Jia Cao Yang ◽  
Xiao Jun Wang ◽  
Gang Zhang ◽  
Sheng Ru Long ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Glass Fiber ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Processing Temperature ◽  
Crosslinking Reaction ◽  
Compression Moulding ◽  
Dynamic Mechanical ◽  
Optimum Processing ◽  
Infrared Spectrometer

Poly (arylene sulfide sulfone)/glass fiber cloth composites (PASS/GFC) were prepared through compression moulding. The optimum processing conditions including temperature, time and pressure were discussed in detail. The cross-linking reaction, mechanical and dynamic mechanical properties were also characterized. The results showed that the optimum processing temperature, pressure and time were 325 °C, 5 MPa and 15 min, respectively. The thioether group (-S-) was oxidized and converted to sulfoxide (-SO-) and sulfone (-SO2-) groups during the crosslinking reaction proved by Fourier transform infrared spectrometer. The mechanical and dynamic mechanical analysis measurements showed that mechanical properties, including tensile, bending, impact and storage modulus increased continuously with an increase of the GFC contents.

Dynamic mechanical properties for polyurethane elastomers applied in elastomeric mortar

2012 ◽  
Vol 126 (4) ◽  
pp. 1461-1467 ◽  
Author(s):  
José Atílio Fritz Fidel Rocco ◽  
José Eduardo Salgueiro Lima ◽  
Vera Lúcia Lourenço ◽  
Natássia Lona Batista ◽  
Edson Cocchieri Botelho ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dynamic Mechanical Properties ◽  
Polyurethane Elastomers ◽  
Dynamic Mechanical
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