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All results for portal tecnológico · 2371 results

20. Structural characterization of polymer nanocomposites

20. Structural characterization of polymer nanocomposites

The performance of a heterogeneous material, such as polymer nanocomposites (PNCs) is dictated by three main factors: (i) the inherent properties of the components; (ii) interfacial interactions; and (iii) structure of the PNCs. The structure of a PNC depends on the dispersion and distribution of the nanoparticles (NPs) in the polymer matrix. However, improving the dispersion by mechanical means or via chemical bonding can influence the propertie...

Research Paper

  • +3 months

A New Approach for the Quantitative Analysis of Degree of Dispersion of Clay Particles in the Polymer Matrix by Electron Microscopy Combined with Smallangle X-ray Scattering

The main objective of this work is to propose a new approach for the quantitative analysis of the degree of dispersion of clay particles in the polymer matrix by small-angle X-ray scattering (SAXS) combined with electron microscopy. The dispersed structure of the clay particles in the poly[(butylene succinate)-co-adipate] (PBSA) matrix was studied by SAXS. The morphology of the nanocomposites was extensively studied by scanning transmission elect...

Research Paper

  • +3 months

41. Thermal and rheological properties of biodegradable poly [(butylenesuccinate)-co-adipate] nanocomposites.

The thermal and rheological properties of clay-containing poly[(butylene succinate)-co-adipate] (PBSA) nanocomposites are reported. The nanocomposites of PBSA with various weight percentages of organically modified montmorillonite (OMMT) loadings have been prepared by melt-mixing in a batch-mixer. The melting and crystallization behaviours of PBSA and its nanocomposites have been studied using differential scanning calorimeter (DSC). The melt-sta...

Research Paper

  • +3 months

Study on Nanoclay Dispersion in a Polymer Matrix by High-Resolution Electron Microscopy Combined with Electron Tomography

In this study, we choose poly[(butylene succinate)-co-adipate] (PBSA) as our model polymer. PBSA is a random copolymer of poly(butylene succinate) (PBS); which shows a variety of interesting physical properties, including biodegradability. The nanocomposite of PBSA with methyl tallow bis(2-hydroxylethyl) quaternary ammonium modified montmorillonite (MMT) (commercially known as C30B) were prepared by melt-mixing in a batch mixer. The nature of the...

Research Paper

  • +3 months

39. Structural Analysis of Liquid Crystal Polymer Based Nanocomposites by X‐Ray Scattering.

The main theme of this work is to support the unusual melt-state rheological properties of the clay-containing nanocomposites of thermotropic liquid crystal polymers by small- and wideangle X-ray scattering. The changes of dispersion of silicate particles in the LCP matrix as well as change in crystal growth of LCP were extensively studied by X-ray scattering in both smalland wide-angle regions. The generalised indirect Fourier transformation ...

Research Paper

  • +3 months

43. The quantitative analysis of nano-clay dispersion in polymernanocomposites by small angle X-ray scattering combined with electronmicroscopy

The main objective of this work is to propose a new approach for the quantitative analysis of the degree of dispersion of clay particles in the polymer matrix by small angle X-ray scattering (SAXS) combined with electron microscopy. Due to the low temperature processibility and good thermal stability, poly[(butylene succinate)-co-adipate] (PBSA) was chosen as a model polymer matrix for this study. The nanocomposites of PBSA with four different we...

Research Paper

  • +3 months

44. Viscoelastic Properties of Clay‐Containing Nanocomposites ofThermotropic Liquid‐Crystal Polymer.

The nanocomposites of liquid-crystal polymer (LCP) with two different weight per cents of claywere preparedviathe melt extrusion method. To investigate the properties of the materials inthe linear and non-linear viscoelastic regions, both oscillatory and rotational tests were carriedout. The results showed that the nanocompositewith higher clay content exhibited an almostdefectless partially cross-linked structure com-pared to the nanocomposite w...

Research Paper

  • +3 months

45. Influence of degree of intercalation on the crystal growth kinetics of poly [(butylene succinate)-co-adipate] nanocomposites

The influence of the degree of intercalation of polymer chains in the two dimensional silicate galleries on the crystallization behavior of poly[(butylene succinate)-co-adipate] (PBSA) is being reported on. The nanocomposites were prepared by melt-blending of PBSA and organically modified montmorillonite (OMMT) in a batch-mixer. Two different types of commercially available OMMTs, with different extents of miscibility of organic modifiers with PB...

Research Paper

  • +3 months

Nonisothermal crystallization kinetics of poly(ethylene terephthalate) nanocomposites

This article reports the nonisothermal crystallization kinetics of poly(ethylene terephthalate) (PET) nanocomposites. The non-isothermal crystallization behaviors of PET and the nanocomposite samples are studied by differential scanning calorimetry (DSC). Various models, namely the Avrami method, the Ozawa method, and the combined Avrami-Ozawa method, are applied to describe the kinetics of the non-isothermal crystallization. The combined Avrami ...

Research Paper

  • +3 months

Effect of Organoclay on the Orientation and Thermal Properties of Liquid-Crystalline Polymers

The preparation and thermal and thermo-mechanical properties of nanocomposites based on liquid-crystalline polymers (LCP) and organically-modified layered silicate (OMLS) is described. From XRD patterns, very little smectic ordering is present in the pure LCP; in the nanocomposites, the polymer chains tended to orient in the direction of the dispersed clay layers. According to the DSC results, during first heating, the first melting peak represe...

Research Paper

  • +3 months

Effect of Organoclay on the Morphology andProperties of Poly(propylene)/Poly[(butylenesuccinate)-co-adipate] Blends

The effect of organically modified clay on the morphology and properties of poly(propylene)(PP) and poly[(butylene succinate)-co-adipate] (PBSA) blends is studied. Virgin and organoclaymodified blends were prepared by melt-mixing of PP, PBSA and organoclay in a batch-mixer at1908C. Scanning electron microscopy studies revealed a significant change in morphology ofPP/PBSA blend in the presence of organoclay. The state of dispersion of silicate lay...

Research Paper

  • +3 months

Thermal and thermomechanical properties of poly[(butylene succinate)-co-adipate] nanocomposite

In this article the thermal and thermomechanical properties of neat poly[(butylene succinate)-co-adipate] (PBSA) and its nanocomposite are reported. Nanocomposite of PBSA with organically modified synthetic fluorine mica (OSFM) has been prepared by melt-mixing in a batch mixer. The structure of nanocomposite is characterized by X-ray diffraction patterns and transmission electron microscopic (TEM) observations that reveal homogeneous dispersion o...

Research Paper

  • +3 months

Thermal and Thermo-mechanical Properties of Poly(ethylene terephthalate) Nanocomposites

In this study poly(ethylene terephthalate) (PET)/clay nanocomposites with two different weight percentages of montmorillonite (MMT) have been prepared by melt-extrusion technique. The X-ray diffraction (XRD) patterns and transmission electron microscopic (TEM) images reveal the formation of intercalated nanocomposites. The melting and crystallization behaviors of neat polymer and nanocomposite samples have been investigated by using both conve...

Research Paper

  • +3 months
Advanced CMC - EU edition MasterClass

Advanced CMC - EU edition MasterClass

08 - 10 March, 2023

online

 This training will present Technical and regulatory requirements for developing a medicinal product which are becoming stricter every day, the products themselves become more and more complex. ...

  • +1 month
Dissolution testing - EU edition MasterClass

Dissolution testing - EU edition MasterClass

07 - 08 March, 2023

online

This topic is not only of central importance in the context of generic drug development, but also in particular in the case of changes in the physicochemical properties of the active substance, in the manufacture and/or composition of products, and in the case of site transfers....

  • +1 month