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Crystallinity storage modulus


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Dynamic Mechanical Analysis in the Analysis of Polymers and

The rubbery plateau is also related to the degree of crystallinity in a material, although DSC is a better method for characterizing crystallinity than The storage modulus and complex viscosity are plotted on log scales against the log of frequency. In analyzing the frequency scans, trends in the data are more significant than specific

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Measurement of Glass Transition Temperatures by

such factors as the crystallinity of the polymer, crosslinking, and plasticizers. The glass transition''s sensitivity to these factors of the storage modulus and the other after the sudden drop of the storage modulus in the transition region (Figure 1). There are several different mathematical ways to construct the tangent and

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Storage modulus changes with temperature in poly(vinyl

determined by DSC even though some crystallinity remains in blends with PVA concentrations above 50wt%. Dynamic mechanical measurements of these blends and storage modulus of PAA is the only one showing the actual values. The storage modulus, E'', of PVA starts to decrease at 55°C with a smooth plateau up to 175°C. In contrast, the

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Ultra-High-Molecular-Weight-Polyethylene (UHMWPE) as a

The change in oxidation index with (a) radiation dose; and (b) aging time.Reprinted with permission from [].Multiple factors influenced the crystallinity and oxidative degradation by irradiation [61,62].The dose and dose rate of irradiation strongly influence the crystallinity and oxidation of UHMWPE [55,63,64,65,66,67,68,69].A suitable post-irradiation process eliminates

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Relationship between the Young''s Modulus and the Crystallinity

The nonlinear relationship between the Young''s modulus (E) and the degree of crystallinity (X Raman) is established for cross‐linked poly(ε‐caprolactone) (PCL).PCL is used in cancer radiotherapy as an immobilization membrane. Atomic force microscopy and Raman spectroscopy focusing on the same micro‐area are used to obtain E and X Raman,

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Materials Today Communications

we use a novel continuous dynamic analysis (CDA) to monitor the evolution in storage modulus and loss factor of Kevlar 49 fibers as a function of strain via a quasi-static tensile test. Unlike traditional degree of crystallinity, has a maximum storage modulus of 268.5 GPa, more than two orders of magnitude greater than that of SEBS,

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A frequency-dependent effective medium model for the

The simplest empirical models relate the crystallinity to either the storage modulus[5] or the logarithm of the storage modulus [6]. Both are normalized such that the crystallinity varies from zero in the melt state to one in the semicrystalline state. Since the storage modulus can span multiple orders of

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2.10: Dynamic Mechanical Analysis

The glass transition temperature can be determined using either the storage modulus, complex modulus, or tan δ (vs temperature) depending on context and instrument; because these methods result in such a range of values (Figure (PageIndex{6}) ), the method of calculation should be noted.

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Crystallinity

Crystallinity can also restrict molecular movement of the polymer chains above the T g raising the modulus. The higher the crystallinity, the more rigid the polymer. Some polymers tend to melt over a wide temperature range, in which case the modulus may fall over a range of temperatures leading up to the melting point T m.

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Complete Thermal Characterization of PTFE

E*: Complex Elastic modulus The complex modulus (elastic component), storage modulus, or G'', is the "real" part of the samples the overall complex modulus. This elastic component indicates the solid like, or in phase, response of the sample being measurement. elastic modulus E'': Storage modulus, elastic contribution to E*

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Characterization of industrial low-density polyethylene: a thermal

From the mastercurve of storage G'' and loss modulus G" of LDPE 1840 and LDPE 3020D at T = 150 °C, we used the IRIS software (Winter and Mours 2006) to construct van Gurp-Palman plots (vGP), i.e., loss angle (delta) as a function of complex modulus G *, of the samples as illustrated in Fig. 10.

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The effects of crystallinity on the mechanical properties and the

Fig. 3 shows the storage modulus of PTFE specimens at a frequency of 1 Hz. It is shown that TF had the highest storage modulus in all the temperature range from 20 °C to 250 °C followed by LNTF and HTF, respectively. It is illuminated that the increase of crystallinity and the formation of large crystals enhanced the load bearing capacity and

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Structure and properties of UHMWPE products strengthened and toughened

It is well known that the crystallinity, lamellae thickness, morphology, and arrangement of crystallites affect UHMWPE properties, especially mechanical strength and wear resistance [18].The crystal phase can impart stiffness to UHMWPE once above its glass transition temperature, so that its yield strength and modulus tend to increase with its crystallinity and

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Crystallinity and temperature dependent mechanical properties of

In low temperature range from −50 °C to 25 °C, the storage moduli of samples hardly decrease and show a negative dependency on crystallinity. The higher the crystallinity, the lower the storage modulus. With increasing temperature, the storage moduli of samples drop

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Fabrication and Characterization of PEEK/PEI Multilayer Composites

A decrease of storage modulus was observed for the longest processing time, due to the reduction of the crystallinity associated to the higher PEEK/PEI interface. Two T g ''s could be observed in both samples ( Figure 6 ) and two separate relaxation peaks were observed in loss modulus profile, indicating that the PEEK/PEI multilayer were not

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Measurement of Glass Transition Temperatures by Dynamic

Glass Transition from the Storage Modulus. The glass transition from the storage modulus onset is typically the lowest T g measured by DMA and rheological methods. This method is a good indicator of when the mechanical strength of the material begins to fail at higher temperatures and is particularly useful for determining the useable range for a load bearing element.

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Miscibility, crystallization, mechanical, and rheological properties

The storage modulus is associated with the elastic response of the sample. For the degree of crystallinity (X c), as shown in Table 1, the X c of neat PLA was 23.2%, while the X c of PLA in the blends dropped sharply to 5.9% of PLA-5,

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Structure–property relationship for poly(lactic acid) (PLA) filaments

Partial storage modulus (E′) increase above Tgas well as additional small peak in loss modulus (E″) of the lower crystallinity sample was assigned to recrystallization. The multiple overlapped peaks in the E″ and tan δ curves and subsequent crystallization along with exothermic peak right after Tg suggests the existence of both relaxed

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Crystallinity and temperature dependent mechanical properties

Crystallinity and temperature dependent modulus in poly(4-methyl-1-pentene) were investigated over a wide temperature range covering glass transition of the amorphous phase turns out that the storage moduli of different samples decrease with the increase of crystallinity below T g. The storage moduli of different samples are the same regardless of

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A re-examination of the elastic modulus dependence on crystallinity

On Fig. 1 are plotted the modulus data as a function of the DSC-determined crystallinity. This unique data collection confirms the usually reported trend that the elastic modulus monotonically increases with crystallinity. In addition to the experimental data, the Reuss and Voigt stiffness limits have been represented in Fig. 1.The crystalline and amorphous

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About Crystallinity storage modulus

About Crystallinity storage modulus

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