Preparation and characterization of poly(vinyl alcohol)‐based magnetic nanocomposites. 1. Thermal and mechanical properties

Abstract

CoFe 2 O 4 magnetic nanoparticles were prepared by in situ precipitation and oxidation of Co 2ϩ and Fe 2ϩ within a sulfonated polystyrene resin. The nanometric particles were characterized by X-ray diffraction. A ferrofluid was prepared from the CoFe 2 O 4 mineralized polymer resin and water. Poly(vinyl alcohol) (PVA)-based nanocomposite materials were obtained by mixing different amounts of ferrofluid (compositions ranging within 0 -51 wt % of mineralized resin) with an aqueous solution of the polymer. The PVA composite materials were characterized by TGA, DSC, and stressstrain testing. The thermal and mechanical properties of PVA change with filler content, exhibiting an initial increase in these properties due to polymer-filler interactions. After a maximum value, at about 15 wt % of mineralized resin, the mechanical properties decrease probably due to particle aggregation which causes phase separation. The results obtained show that the nanoparticles are dispersed in the amorphous regions of the polymer, the crystalline zones remaining unaltered up to compositions as high as 30 wt %.

Effect of magnetic nanoparticles on the thermal properties of some hydrogels

“…Therefore, it can be said that there is an enhancement of thermal stability in the ferrogels. This kind of observation was also reported by López et al [17] for their PVA nanocomposites prepared with CoFe 2 O 4 nanoparticles. The proposed explanation is related to the restrictions in polymer chain mobility and to the reduction of diffusivity of attacking agents within the polymer matrix, both due to the polymer-filler interactions [16,17].…”

Dynamic Mechanical, DSC, and Electrical Investigations on Nano Al2O3Filled PVA:NH4SCN:DMSO Polymer Composite Dried Gel Electrolytes

“…Simultaneously, the decreasing nature of storage modulus beyond 4 wt% Al 2 O 3 suggest loss in molecular mobility of the polymer matrix. This can be attributed to the agglomeration of filler particles rendering a large surface area, which diminishes filler-polymer interaction [21]. DMA responses have also been used to determine the occurrence of molecular mobility transitions such as glass transition temperature and other relaxations [22][23].…”

γ-Irradiation Effect on the Non-Cross-Linked and Cross-Linked Polyvinyl Alcohol Films

“…There are a large number of reports on PVA with different additives in order to modify and improve its properties [5][6][7] . Inorganic additives, such as transition metal salts, have considerable effect on the optical and electrical properties of PVA [8] .…”

“…It is a well-known, water-soluble polymer which is widely used as paper coating agents, adhesives, and films. Recently, PVA has been used in adhesives manufactured of automotive safety glass in textile size and finishes in paper sizes and coating, as binder for ceramics, foundry cases, nonwoven fabric and various pigment [1][2][3][4][5][6][7][8] .…”