جستجوی مقالات مرتبط با کلیدواژه « پلیمرهای پرشاخه » در نشریات گروه « مهندسی شیمی، نفت و پلیمر »

In this review paper, Epoxy-based nanocomposite coatings are focused that are produced by hyperbranched polymer-modified nanofillers. At first, keywords like epoxy, nanocomposite, hyperbranched polymer are defined and then fabrication methods and modification of nanocomposite coatings, various categorizations, advantages and disadvantages are investigated. Consequently, the effect of modification and addition of different nanoparticles on the characteristics of the coating such as physical-mechanical properties, anticorrosion and dispersion level are reviewed. Considering the discussions it can be concluded that using hyperbranched polymers as modifier for nanoparticles in order to improve the dispersion and its stability and increasing the various properties of the nanocomposite coatings, is useful and promising.

Since coatings industry is pressured from environmental protection agency to reduction volatile organic compounds, UV curing technology is increasingly being considered. UV curing is consist of polymerization process in which monomers and oligomers having several functional groups are converted into a three-dimensional polymer network under photo initiator and UV radiation within seconds. Despite appropriate advantages of this kinds of coatings, were added Combinations as additives them to modify some of their features. One of them is hyperbranched polymers. hyperbranched polymers having their unique features including spherical shape and a lot of terminal group were entered in the formulation of UV curable coatings and gave them special properties. Introduction of these structures in to the UV curing coating can effect both performances futures of coating like viscosity and final futures of films like thermal or mechanical resistance. In this study is described UV curing coating, hyperbranched polymers and their effect on the UV curing coatings.

Dendritic polymers are a new class of highly branched macromolecules that have received a large amount of attention recently due to their particular properties. The uniqueness of these 3-dimensional polymers is related to the ability to control their size, shape, molecular weight, topology, and surface chemistry to an extent unprec-edented in polymer science. Globular shape, unentanglment structure and a lot of terminal groups on the surface of molecule, are the important properties of these polymer structures. These properties cause main difference between these structures and similar linear polymers. Among special feature of dendritic polymers, the capability of situation of terminal groups, makes dendritic polymers suitable for their improvement role in polymer blends. Dendritic polymers divided into three groups. Dendrimers, dendrigrafts and hyperbranched polymers are these groups and the hyperbrenched polymers have the greatest application in industreis such as paint and coating and printing inks. In this paper, addition to investigate the properties of dendritic polymers, we explain about the effect of these structures on the rheological and curing properties of polymer blends.