Polymer Nano Composite Research Papers (original) (raw)

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- by
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- Materials Science, Nanoparticles, Nanotechnology, Polymers

The growing demand for continual improvement in the engineering
applications of thermoplastic and thermoset polymer materials compared with
metals in various applications led to the emergence of hybrid nanocomposites by
the addition of different nano fillers, with advanced properties. Nano fillers such as
carbon black, pyrogenic silica, nano oxides and metal particles are being used as
additives in polymers from decades. However, the increasing stringent environmental
legislation and consumer awareness highlights the importance of natural,
low cost and abundant clay materials such as nanoclays. The hybridization of
natural fiber with nanoclay is interestingly positive due to the tendency of nanoclay
to upsurge both flexibility and rigidity of the natural fiber in one step. The most
promising nanoclay involved in the modification of polymers and natural fibers
reinforced polymer composite are montmorillonite, organoclay, saponite and halloysite
nanotubes. Nanoclay/natural fibers hybrid nanocomposites have engrossed
great attention since their discovery due to their wide variety of properties in food
packaging, biomedical devices, automotive industries and other consumer applications
with better thermal, physical, mechanical, optical and barrier properties.
Present article designed to be a comprehensive source of recent literature and study
on nanoclay fillers, its different classes, modification of polymers by nanoclay and
their varied applications. This article also intended to covers the recent advances in
natural fiber/nanoclay hybrid polymer nanocomposites research study, including
their different commercial applications.

- by Mohammad Asim
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- Polymer Nano Composite

In this paper, PMMA/ZnO nanocomposites have been prepared by a very simple, facile and versatile chemical approach. The prepared PMMA/ZnO nanocomposites possess no color, high transparency, good thermal stability, UV-shielding capability, luminescence and homogeneity. The chemical process involved solution mixing of ZnO nanoparticles dispersed in DMAc with the Polymethylmethacrylate (PMMA) matrix dissolved in the same solvent. The effect of ZnO content on the physical properties of the PMMA matrix is investigated by X-ray diffraction, field emission scanning electron microscopy, thermogravimetric analysis, UV–Vis absorption and photoluminescence spectroscopy. It was found that pure hexagonal ZnO nanoparticles with an average particle size of 4–8 nm were homogeneously dispersed in the PMMA matrix. A significant improvement in thermal properties was observed with the incorporation of 1.0 wt% ZnO nanoparticles. The prepared nanocomposite films are highly transparent and a clear excitonic peak is observed in their absorption spectra. Measurement of room temperature photoluminescence spectra shows intensive near-band edge emission peak at 3.28 eV without any structural defects for a nanocomposite film with a filler content of 1.0 wt%.

- by Majid Khan
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- Polymer Nanocomposites, PMMA, Polymer Nano Composite, ZnO (Zinc Oxide)

The CdS and ZnS nanoparticles have been synthesized successfully by the simple chemical method of “layer-by-layer” in the functionalized thermoplastic elastomeric NBR/PE copolymer films. Structural and optical properties have been characterized by FT-IR, XRD, AFM, UV–vis and PL spectroscopy measurements. The XRD results indicate that CdS and ZnS nanoparticles were formed with hexagonal and cubic phase with their preferred orientation along the [002] and [111] in the polymeric matrix, respectively. The optical measurements of the CdS and ZnS nanoparticles are apparently blue-shifted compared to a bulk which indicates the decreases of the particles size. The direct allowed band gap was estimated 2.67 eV for CdS and 3.72 eV for ZnS nanoparticles. According to the characterization methods, it was revealed that the average grain size for the both materials takes the values in 5–10 nm.

- by Zamin M and +1
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- Polymer Engineering, Physics, Chemistry, Physical Chemistry

ZnS nanoparticles have been synthesized by the facile chemical route with a narrow size distribution in the MA/octene-1 copolymer matrix and effect of reaction time has been discussed. X-ray diffraction pattern confirms the pure cubic phase of ZnS with 5-7 nm average crystal sizes which are in good agreement with the AFM and UV-Vis measurements. Absorption spectra exhibit a strong blue shift from the bulk with the 3.98 eV optical band gap which clearly indicates the strong size confinement effect. Thermogravimetric analyses show increased thermal stability of the nanocomposite compared to the copolymer. The possible growth mechanism of the particles formation and stabilization has been discussed.

- by Zamin M
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- Physics, Chemistry, Physical Chemistry, Synthesis of nanoparticles

The present work shows for the first time worldwide that sucrose can be easily placed by simple techniques within the micropores or nanostructure of the mercerized non-dried cotton linter fibers to create a low-cost cellulose substitute. Such sucrose-containing nanocomposites find suitable use as specialty absorbent paper. Relative to the sucrose-free paper, the sucrose-containing counterparts exhibit greater breaking length and remarkably high water uptake (WRV) up to a sucrose content of 8–15% w/w. Mercerization of cotton linters before incorporating them with sucrose greatly enhanced the retention of sucrose in the prepared paper nanocomposites as compared to the case of unmercerized cotton linters. We assume that regions of the cell wall lamellae, on both sides of the sucrose spacers, are stressed during drying because the sucrose spacers hinder them to relax. This leads to a strain, which makes some microfibrils partially released and protrude out of the fiber. Thus, a sort of fiber beating takes place. We called this phenomenon incorporation beating or encapsulation beating to differentiate it from chemical and mechanical beatings, and it explains the great increase in breaking length of the paper nanocomposites prepared from the mercerized non-dried sucrose-loaded linters.

- by Prof Dr Tamer Y A Fahmy and +2
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- Nanomaterials Characterization, Nanocomposites, Nanomaterials, Nanotechnology