Study on kinetics of polymer melt intercalation by a rheological approach

Li, Jian; Zhou, Chixing; Wang, Gang; Zhao, Daiqing

doi:10.1002/app.12094

Cited by 28 publications

(21 citation statements)

References 23 publications

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“…Specifically, the measurement time of frequency sweep t f should be much smaller than the structural evolution time t s . Therefore, this method is suitable to study slow kinetics of physical or chemical transitions (219)(220)(221)(222). The schematics of cyclic frequency sweep are shown in Figure 24, and the phase separation of ultrahigh molecular weight polyethylene/liquid paraffin at 115…”

Section: Series Shearmentioning

confidence: 99%

Rheological Measurements

2013

Encyclopedia of Polymer Science and Technology

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Rheology is the science to study the flow and deformation of matter. It becomes an important field in material science and engineering, food, biotechnology, and so on. The objects in rheological study are not the ideal solid and ideal fluid, which can be described by the Hookean elastic model and the Newtonian viscous model, respectively. Instead, the rheological study often focuses on materials that can exhibit viscous, elastic, and plastic behavior under different flow conditions. They are often termed as complex fluids or soft matter, which include polymers, gels, suspensions, emulsions, biofluids, foods, inks (1). In contrast to hydrodynamics, which often accounts for the complex flow behavior of simple fluids, simple geometry is utilized in rheological measurements to understand the rather complicated relationship between the mechanical input and output of complex fluids. The real flow fields encountered in many applications (such as polymer extrusion, injection molding, blow molding, fiber spinning, inkjet printing, coating) are rather complicated (2). It becomes a problem whether the rheological measurements that performed under simple flow fields are useful in understanding the complicated flow behaviors of complex fluids. Fortunately, it has been proved in many examples that the properties determined from simple rheological measurements are sufficient to quantify the material parameters in various constitutive equations, which have been used widely and successfully to simulate the flow behaviors in polymer processing (3-11). The most frequently used simple flow fields are simple shear flow and simple extensional flow.The simplest geometry that defines the simple shear is two infinite parallel plates separated by a distance h. The liquid is set between two plates with one plate moving parallel to the other (Fig. 1). In reality, when the length L and the width B are much larger than the gap h, the flow in the center regime resembles the flow between two infinite plates. It means that the edge effects are ignored in most experimental shear geometries. In rheological measurements, the flow between two plates should be laminar. Moreover, it is usually assumed that the velocity across the gap satisfies a linear profile. As shown in Fig. 1, if the bottom plate is fixed and the upper plate moves horizontally with the velocity V, the fluid velocity varies linearly from 0 at the bottom plate to V at the upper plate if the no-slip boundary condition is satisfied. The linear velocity profile generates a constant velocity gradient, which is known as the shear rate. Then, the flow field between two parallel plates is homogeneous in the shear rate. The homogeneous assumption is nontrivial in the rheological tests since the actual velocity

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Section: Series Shearmentioning

confidence: 99%

Rheological Measurements

2013

Encyclopedia of Polymer Science and Technology

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“…FTIR and Raman spectroscopy has also proved a useful probe of the functionalities in the polymer matrix and their interaction with the nanomaterials (Gajendran& Saraswathi 2008). WAXD is commonly used to probe the nanocomposite structure (Monticelli et al, 2007) and kinetics of the polymer melt intercalation (Li et al, 2003). In layered silicate nanocomposite, a fully exfoliated system is characterized by the absence of intensity peaks in WAXD pattern, which corresponds to a d-spacing of at least 6 nm (Lia et al, 2000).…”

Section: Characterization Techniques For Nanocompositesmentioning

confidence: 99%

Thermoplastic Nanocomposites and Their Processing Techniques

Haider¹,

Khan²,

Al-Masry³

et al. 2012

Thermoplastic - Composite Materials

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“…On the other hand, the slope values of G' for PA6/OMMT nanocomposites at 1 rad/s and 100 rad/s is 0.89 and 0.96, respectively. According to Li et al [16], changes of G' in the viscoelastic range sensitively reflect the effects of clay dispersion. The higher the slope, the less stable the clay is.…”

Section: Rheological Propertiesmentioning

confidence: 99%

Mechanical, morphological and rheological properties of polyamide 6/organo-montmorillonite nanocomposites

Chow¹,

Ishak²

2007

Express Polym. Lett.

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Abstract. Polyamide (PA6) nanocomposites containing 4 wt% organo-montmorillonite (OMMT) were melt-compounded followed by injection molding. The mechanical properties of the PA6/OMMT nanocomposites were studied through tensile and flexural tests. The rheological behaviour of the nanocomposites was determined by plate/plate rheological measurements. Attempts were made to trace the rheological parameters that reliably reflect the observed changes in the clay dispersion. X-ray diffraction (XRD) and atomic force microscopy (AFM) were used to characterize the exfoliation and dispersion of the OMMT in the PA6 matrix. The thermal properties of PA6/OMMT nanocomposite were characterized by Dynamic Mechanical Thermal Analysis (DMTA). The tensile modulus and strength of the PA6 was increased in the presence of OMMT. The flexural strength of PA6/OMMT was approximately doubled compared to the tensile strength value. The significant enhancement of both tensile and flexural strength was attributed to the delaminated clay formation. XRD and AFM results revealed the formation of PA6 nanocomposites as the OMMT was successfully exfoliated.

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Study on kinetics of polymer melt intercalation by a rheological approach

Cited by 28 publications

References 23 publications

Rheological Measurements

Rheological Measurements

Thermoplastic Nanocomposites and Their Processing Techniques

Mechanical, morphological and rheological properties of polyamide 6/organo-montmorillonite nanocomposites

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