Preparation and characterization of high melt strength
Compared with the raw TPEE, the modified TPEEs have a higher storage modulus and loss modulus, especially in the low-frequency region, which indicates an increasing melt elasticity. The non-terminal behavior of the modified TPEE suggests that there is a longer relaxation mechanism, which could be attributed to the formation of long
Effect of Molecular Structure Change on the Melt Rheological
Storage modulus and the loss modulus at low frequency increased more than 10 4 and 10 3 times to those of neat polyamide without forming a network structure. The rheological
Storage Moduli of in situ Polymerised and Melt Extruded PA6
The effective modulus of the carbons, room temperature storage modulus and storage modulus at 80 ⁰C were evaluated using Dynamic Mechanical and thermal Analysis (DMTA). Melt processing, was employed to make PA6/carbon composite systems over a range of loadings of Graphite (G) and Graphite Nano Platelets (GNP) fillers.
Rheological Measurements and Structural Analysis of Polymeric
Polymers 2021, 13, 1123 3 of 25 Figure 1. Example for storage modulus G0, loss modulus G00, and tangent of the phase angle d as functions of the angular frequency w (polyisobutylene with Mw = 85 kg/mol and Mw/Mn = 2) [2]. As shown exemplarily in Figure1, G0and G00increase with w and exhibit a distinct
Phase continuity detection and phase inversion phenomena in immiscible polypropylene/polystyrene blends with
Alternatively, several authors [43], [44] have shown that the storage modulus of some polymer blends in the melt state follows a power law behavior in the terminal zone. Domains with different characteristic length scales entail a distribution of terminal relaxation times and a gel-like behavior.
Extrusion: Where's the Data? The Importance of Melt Strength in Extrusion
The lower the crossover point of the G" and G'' lines on both the horizontal and vertical axes the greater the melt strength. There is an important data point for extrusion-grade polymers that is almost never found in the data sheets. Spec sheets typically show the solid density, melt flow, and a variety of physical properties of the solid
Rheological and printability evaluation of melt-cast explosives for
In addition, the elastic modulus (G'') and viscous modulus (G'''') of molten TNT/HMX melt-cast explosives were also investigated at different angular frequencies (ω), as shown in Fig. 6. The G'''' were higher than G'' in all the formulations, which indicated that the molten TNT/HMX melt-cast explosives are viscous.
Mechanical behavior and optical transparency of polyamide 6 of
The phase composition and supermolecular structure of polyamide 6 (PA 6) melt-crystallized on cooling at different rates or cold-crystallized at different temperatures were characterized and related to the optical transparency, stiffness and the stress–strain behavior. Cold-crystallization results in non-spherulitic formation of γ-mesophase or α
Storage modulus, G′, of neat PEO/PMMA and two
The PNPs were dispersed into a commercial, injection grade, PA6 matrix by melt extrusion, at a concentration of 3 wt%. Thermal analysis showed that the PNPs did not influence the melting and decom
Multiscale rheology model for entangled Nylon 6 melts
A multiscale simulation method is used to calculate the rheological properties of entangled Nylon 6 melts, including the stress relaxation modulus, storage and loss moduli, and the melt viscosity.
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Characterization of industrial low-density polyethylene: a thermal,
The study of commercial low-density polyethylenes (LDPEs) has always focused on the effects of the molecular architecture of the polymer on its shear and extensional rheological properties due to their direct influence on manufacturability. However, the complex morphology of industrial-grade LDPEs also affects the
A frequency-dependent effective medium model for the rheology
where the complex shear modulus of the initial polymer melt with zero crystallinity (ξ = 0) is G 0 * (ω) and the complex modulus once the polymer has reached the semicrystalline state (ξ = 1) is G ∞ * (ω).The parameter A = −(1 − ξ c)/ξ c where ξ c is the critical volume fraction where percolation occurs, and so A can range from 0 (at ξ c = 1) to infinity (at ξ c = 0).
Viscoelastic melt rheology and time–temperature superposition of
In unfilled PC, at low reduced frequencies, loss modulus is always higher than the storage modulus (as can be seen for PC 2205 in the inset of Fig. 6), and the materials exhibit liquid-like properties typical of polymer melts with the characteristic gradients in the .
Multiscale rheology model for entangled Nylon 6
A multiscale simulation method is used to calculate the rheological properties of entangled Nylon 6 melts, including the stress relaxation modulus, storage and loss moduli, and the melt viscosity.
Polymers | Free Full-Text | Comprehensive Enhancement in Thermomechanical Performance of Melt
A simple and scalable fabrication process of graphene nanoplatelets (GnPs)-reinforced polyether ether ketone (PEEK) filaments with enhanced mechanical and thermal performance was successfully demonstrated in this work. The developed PEEK–GnP nanocomposite filaments by a melt-extrusion process showed excellent
(a) Storage modulus of PET | Download Scientific Diagram
The storage modulus was risen at temperature around 100 C, which was the results of the cold crystallization of PLA (Mofokeng et al., 2012), similarly to the DSC results. In Figure 1(b), the tan
Storage modulus (a); melt viscosity (b) and Han polt (c) versus.
Storage modulus (a); melt viscosity (b) and Han polt (c) versus frequency at 230 C, and melt viscosity (d) versus temperature at 0.1 rad/s for PA6 and flame retardant PA6 composites.Two different
Understanding Rheology of Thermoplastic Polymers
3 AAN013 Figure 4: Molecular weight distribution differences in polymer melts show best in the terminal region of the storage modulus G''. A good indicator of MWD changes is the cross over modulus G c. Branching Polymer chain branches can vary in number
Storage modulus and tan_delta of the melt samples as a function
A maximum modulus of rupture of 12.1 MPa comparable to that of commercial fiberboards and high modulus of elasticity, was obtained at 20% LCNF content for panels produced at 180 C.
A new strategy to improve viscoelasticity, crystallization and
The absolute value of complex viscosity and storage modulus increased significantly for the EIReP modified blends, suggesting the improved melt strength and
Adhesion and viscoelastic property of poly(ethylene-co-vinyl acetate) based hot melt adhesives
Although a different rosin was used in this study (this study using SE10, instead of Foral 105 used by Shih et al. [3]), a similar result was found in this study.As shown in Fig. 2, there is a cross-over temperature in each curve.Shih et al. [3] reported that Foral 105 tackified EVA samples have higher storage moduli (G′ or E′) than those of
Modification of melt memory effect by addition of poly(butylene
Temperature dependence of the tensile storage modulus E′ (filled symbols) and loss tangent tan δ (open symbols) at 10 Hz of the extruded strands of (top) the TPEE and (bottom) TPEE/PBT (95/5). Fig. 11 shows the residual strains after applying strains of 10% and 15% as a measure of the rubber elasticity of strands.
Dynamic Mechanical Analysis in the Analysis of Polymers and
If one can generate a modulus scan over a wide enough frequency range (Fig. 18), the plot of storage modulus versus frequency appears like the reverse of a temperature scan. The same time–temperature equivalence discussed above also applies to modulus, as well as compliance, tan delta, and other properties.
Preparation of high melt strength polypropylene by addition of an
Decreased crystallinity, gradually increased viscosities, and storage modulus with the increment of zinc carboxylates in the PP-g-MAHZn were investigated
Storage Modulus
Storage modulus is the indication of the ability to store energy elastically and forces the abrasive particles radially (normal force). At a very low frequency, the rate of shear is
Structural and Thermo-Mechanical Properties of Poly(ε
Figure 5 a,b shows the variation of the storage modulus (E'') of neat PCL and modified PCL samples as a function of temperature. The curves of modified PCL samples have the same shape as neat PCL. As shown, the storage modules for the PCL modified by DCP are higher than those of neat PCL over the whole temperature range
Rheology, mechanical properties and peel adhesion of hot-melt
The trend of loss modulus was similar to storage modulus (Fig. 8 (b)). By studying the loss factors of adhesive formulations ( Fig. 9 (a)), it can be understood that the tanδ of EP–NS–0.25, EP-C5-5, EP-C9-5, EP–NS–C9, and EP–NS–C9 formulations are increased with respect to the neat TPU as a result of the improvement of viscous
Hot Melt Adhesives
hot melt performance. STICKY VS. BRITTLE Many hot melt adhesives are supplied as pellets. A pelletizing operation for a new material can be troublesome if the material is too sticky or too brittle. Measurement of the elastic (storage) modulus G'' as a
Mechanical response of four polycarbonates at a wide range of
The storage modulus and loss modulus obtained from these experiments are presented in Fig. 4 (a) and Fig. 4 (b). In Fig. 4 (a), as expected from the discussion in section 3.1, the storage moduli do not agree well with each other; however, the modulus obtained from the three-point bend configuration at room temperature is, as expected,
Storage modulus of ABS-R nanocomposites. | Download
A PET nanocomposite was prepared as master batch by blending with 0.5 wt% of SiOx–PS nanoparticles via melt mixing using a twin screw extruder at 200 C, 210 C and 220 C melting temperatures.
Crystallinity and temperature dependent mechanical properties of
The storage moduli of different samples are the same regardless of crystallinity at around 45 °C where the densities of crystalline and amorphous phases are identical. A model considering parallelly arranged crystalline skeleton and amorphous network allows a decomposition of the measured modulus into moduli of both phases.
Dynamic Mechanical Analysis in the Analysis of
The storage modulus'' change with frequency depends on the transitions involved. Above the T g, the storage modulus tends to be fairly flat with a slight increase with increasing frequency as it is on the
Rheology and properties of melt-processed poly(ether ether
Initially, a strain sweep test was applied to the nanocomposite samples in order to determine the linear viscoelastic regime (LVR) and to characterize the strain dependent viscoelastic properties of the samples. Storage modulus, G ′, is relatively sensitive to the structural changes within the nanocomposites; as can be seen in Fig. 3,
Elongational viscosity scaling of polymer melts with different
where M 0 is the molar mass of the Kuhn segment. Values for M em and M 0 are given in Morelly et al. ().While the BSW spectrum defined by Eqs. to allows for a reasonable quantification of the plateau modulus G N, we will show in the "Comparison between experimental data and model predictions" section that the BSW spectrum
Rheological Measurements and Structural Analysis of Polymeric
The physical meaning of the storage modulus, G '' and the loss modulus, G″ is visualized in Figures 3 and 4. The specimen deforms reversibly and rebounces so that a significant
A new strategy to improve viscoelasticity, crystallization and mechanical properties
The absolute value of complex viscosity and storage modulus increased significantly for the EIReP modified blends, suggesting the improved melt strength and elasticity. The crystallization investigation showed that the cold crystallization peak of PLA phase gradually disappeared after EIReP modification.
Crystallization, rheological and mechanical properties of
The damping factor (tan δ) and storage modulus (G′) curves of neat PBS, PPC, and PVAc as well as PBS/PPC binary and PBS/PPC/PVAc ternary blends are shown in Fig. 2a, b, respectively. The tan δ is associated with the glass transition of polymer, whereas the storage modulus can directly reflect the elastic response of polymer when
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