scholarly journals Ultrasound-Assisted Melt Extrusion of Polymer Nanocomposites

2019 ◽  
Author(s):  
Carlos A. Ávila-Orta ◽  
Pablo González-Morones ◽  
Diana Agüero- Valdez ◽  
Alain González-Sánchez ◽  
Juan G. Martínez-Colunga ◽  
...  
Keyword(s):  
Polymer Nanocomposites ◽  
Melt Extrusion ◽  
Ultrasound Assisted

Efficient Fabrication of Polymer Nanocomposites with Effective Exfoliation and Dispersion by Solid-State / Melt Extrusion

2012 ◽  
Vol 32 (1) ◽  
Author(s):  
Alyssa M. Whittington ◽  
Stephen M. Brouse ◽  
Michael A. Malusis ◽  
Katsuyuki Wakabayashi
Keyword(s):  
Solid State ◽  
Polymer Nanocomposites ◽  
Melt Extrusion

scholarly journals Metamaterial Behavior of Polymer Nanocomposites Based on Polypropylene/Multi-Walled Carbon Nanotubes Fabricated by Means of Ultrasound-Assisted Extrusion

Materials ◽  
2016 ◽  
Vol 9 (11) ◽  
pp. 923 ◽  
Author(s):  
Juan Pérez-Medina ◽  
Miguel Waldo-Mendoza ◽  
Víctor Cruz-Delgado ◽  
Zoe Quiñones-Jurado ◽  
Pablo González-Morones ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Polymer Nanocomposites ◽  
Multi Walled Carbon Nanotubes ◽  
Ultrasound Assisted ◽  
Walled Carbon Nanotubes

scholarly journals Pigmentation and Degradative Activity of TiO2 on Polyethylene Films Using Masterbatches Fabricated Using Variable-Frequency Ultrasound-Assisted Melt-Extrusion

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3855
Author(s):  
Christian J. Cabello-Alvarado ◽  
Zoe V. Quiñones-Jurado ◽  
Víctor J. Cruz-Delgado ◽  
Carlos A. Avila-Orta
Keyword(s):  
Mechanical Stability ◽  
Contrast Ratio ◽  
Accelerated Aging ◽  
Melt Flow Index ◽  
Flow Index ◽  
Melt Flow ◽  
Melt Extrusion ◽  
Yellowness Index ◽  
Tio2 Particles ◽  
Ultrasound Assisted

Ultrasound-assisted melt-extrusion method (USME) is a high-quality process used to produce polymeric compounds with an adequate homogeneous dispersion. This study evaluates white-color films of linear low-density polyethylene (LLDPE) prepared using TiO2 masterbatch obtained by ultrasound-assisted melt-extrusion at variable frequencies (USME-VF). LLDPE with three different melt-flow indices (2, 20 and 50 g/10 min) were used as the polymer matrix. The films were obtained from the dilution of masterbatches of LLDPE (melt-flow index = 2) at a concentration of 7 wt% TiO2. The morphology, pigmentation, TiO2 reactivity, and the mechanical stability of the films were assessed. The masterbatch compounds were evaluated by melt-flow index (MFI) and scanning electron microscopy (SEM). The contrast ratio, yellowness index and mechanical properties of films were also measured. The properties of whiteness and elongation at break improved in the films prepared using masterbatches with higher dispersion. Though the reactivity of the TiO2 particles increased during accelerated aging, it did not affect the elongation to rupture. The yellowness index was moderately affected in films that included TiO2 particles processed using USME-VF.

scholarly journals Clay-Polymer Nanocomposites Prepared by Reactive Melt Extrusion for Sustained Drug Release

Pharmaceutics ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 51 ◽  
Author(s):  
Xu Liu ◽  
Xingyu Lu ◽  
Yongchao Su ◽  
Eucharist Kun ◽  
Feng Zhang
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Polymer Nanocomposites ◽  
Polymer Networks ◽  
Clay Content ◽  
Melt Extrusion ◽  
Dynamic Vapor Sorption ◽  
Sustained Drug Release ◽  
Eudragit Rs ◽  
Reactive Melt

Clay–polymer nanocomposites have exhibited a great potential as carriers for controlled release drug delivery. This study aims to prepare exfoliated montmorillonite–Eudragit RS nanocomposites using reactive melt extrusion and investigate the influence of claying loading, clay types (sodium montmorillonite (Cloisite Na) vs. organomodified montmorillonite (Cloisite 20)) on clay–polymer interactions and drug release properties. The clays were used as the filler material at various levels in Eudragit RS and theophylline was used as the active pharmaceutical ingredient. The resulting structure of the nanocomposites was characterized using TEM (transmission electron microscopy) and XRPD (X-ray powder diffraction). The hygroscopicity of the nanocomposites was investigated using DVS (dynamic vapor sorption). The effect of the interfacial interaction between the polymer and clay sheet, the clay loading as well as the clay type on the drug release behavior were further studied by dissolution testing. TEM and XRPD data show that when the clay content is increased from 5% to 15% by weight, the nanocomposite’s structure switches from a fully exfoliated state to intercalated structures or partial exfoliation with stacked clay layers. FT-IR (fourier transform infrared spectroscopy) and ssNMR (solid-state NMR) results suggest that Cloisite Na and Cloisite 20 layers exhibit different interaction strengths with polymer networks by creating compacted complex structures. The addition of nanoclay in the formulation could robustly adjust drug release profiles, and the clay concentration and type are important factors that affect the crossing-linking density of the nanocomposites by adjusting the drug release properties. This study indicates that the clay–Eudragit RS nanocomposites provide an improved oral controlled drug delivery system that minimizes the drug dosing frequency, potentially leading to improved patient compliance.

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