Tag Archives: nanotechnology

Thermoplastic polyurethane-based nanocomposites reinforced with carbon fillers

STAFIN K., LESZCZYŃSKA A., PIELICHOWSKI K. Please Cite as: CHEMIK 2016, 70, 11–12, 685–690 Thermoplastic polyurethane (TPU) behaves both as a crosslinking rubber and thermoplast at ambient temperature during use and at elevated processing temperature, respectively. In this paper, thermoplastic polyurethane reinforced with carbon nanofillers (e.g. carbon nanotubes, graphene and expanded graphite) was presented. Carbon nanofillers improve mechanical strength, thermal stability and are effective modifiers for manufacturing electrically conductive nanocomposites. Improved or new properties of TPU nanocomposites depend not only on the amount of filler and the method of its incorporation into the polymer matrix, but also on the occurrence of a specific interactions between the filler and rigid or soft TPU segments. Therefore the proper selection and modification of chemical structure of the polymer and filler are crucial for the successful manufacturing of new material with desired properties. Read more in pdf pdf-icon  ...
Read more

Controversy around the definition of nanomaterial in European Union law

Controversy around the definition of nanomaterial in European Union law
JUREWICZ M.

Please cite as: CHEMIK 2014, 68, 12, 1090–1095

According to the Commission Recommendation 2011/696/ EU on the definition of nanomaterial [10]: “Nanomaterial means a natural, incidental or manufactured material containing particles, in an unbound state or as an aggregate or as an agglomerate and where, for 50% or more of the particles in the number size distribution, one or more external dimensions is in the size range 1 nm – 100 nm. In specific cases and where warranted by concerns for the environment, health, safety or competitiveness the number size distribution threshold of 50% may be replaced by a threshold between 1 and 50%”. The definition formulated in the Recommendation 2011/696/EU is based on material particle size as a factor, which most adequately reflects the unusual properties of nanomaterials. In EU legislation there are discrepancies regarding particularly upper particle size dimension and threshold of...

Read more

Military nanomaterials applications

Military nanomaterials applications
CZERWIŃSKA M.

Please cite as: CHEMIK 2014, 68, 6, 536–543

Nanotechnology gives solution for many problems in scientific fields and industries. It is one of the most dynamically developing technology, which gives huge prospects and hopes to solve modern world problems. Nanomaterials, due to small dimensions and better properties than their micrometric analogues, have found wide application in arms industry. Nanomaterials are used to product materials for soldiers protection, for communication devices, detection enemy and for armament. However keep in mind, that nanotechnology has many benefits, but it also has threats (in range of safety), which should be taken into account and eliminated at the basic research chase.

Keywords: nanotechnology, nanomaterials, arms industry

Read more in pdf

pdf-icon

...
Read more

The covalent grafting of polymers to the solid surface

The covalent grafting of polymers to the solid surface

Agata BLACHA, Katarzyna KRUKIEWICZ, Jerzy ŻAK - Silesian University of Technology, Faculty of Chemistry - Department of Physical Chemistry and Technology of Polymers, Gliwice; Poland Please cited as: CHEMIK 2011, 65, 1, 11-19 In this literature review the processes of the solid surface grafting are presented, which lead to the creation of the molecular surface polymeric structures known as polymer brushes. This is an area of nanotechnology, which offers perspective applications in the organic electronics, medicine, transplantology, sensors. The grafting procedures described here are based on the known methods of the living polymerization that are especially useful for the controlled surface process like ATRP, ROMP and ionic polymerization. In addition, a brief review is presented in the area of the organic self assembled monolayers (SAM), which are frequently used as the structure initiating the growth of the polymer chain. Keywords: polymer grafting, polymer brushes, electropolymerization, ATRP, ROMP, ionic polymerization, nanotechnology Read more: pdf-icon...
Read more