Polymers, Free Full-Text

$ 32.00 · 4.7 (147) · In stock

Epoxy/silica thermosets with tunable matrix (vitrimers) were prepared by thermal curing of diglycidyl ether of bisphenol A (DGEBA) in the presence of a hardener—4-methylhexahydrophthalic anhydride (MHHPA), a transesterification catalyst—zinc acetylacetonate (ZAA), and 10–15 nm spherical silica nanoparticles. The properties of the resulting material were studied by tensile testing, thermomechanical and dynamic mechanical analysis. It is shown that at room temperature the introduction of 5–10 wt% of silica nanoparticles in the vitrimer matrix strengthens the material leading to the increase of the elastic modulus by 44% and the tensile stress by 25%. Simultaneously, nanoparticles enhance the dimensional stability of the material since they reduce the coefficient of thermal expansion. At the same time, the transesterification catalyst provides the thermoset with the welding ability at heating, when the chain exchange reactions are accelerated. For the first time, it was shown that the silica nanoparticles strengthen welding joints in vitrimers, which is extremely important, since it allows to repeatedly use products made of thermosets and heal defects in them. Such materials hold great promise for use in durable protective coatings, adhesives, sealants and many other applications.

represents the details of unbiased simulation with single polymers

køn Bær skøjte polycarbonate glass transition fejl skrot begå

Premium Vector Orange text on a orange background

Polymers, Free Full-Text

Polymers, Free Full-Text, benny watts x reader

Bio-based polymers with performance-advantaged properties

Polymers, Free Full-Text, Conductive Thread

Polymers, Free Full-Text

Polymers, Free Full-Text, analyses

PDF) POLYMER BLENDS HANDBOOK GOPALAKRISHNAN DURAISAMY

Polymers, Free Full-Text

Polymers, Free Full-Text, códigos de double xp no block street

Green polymer chemistry: One-pot, metal-free synthesis of macromonomer via direct polycondensation of lactic acid and its radical polymerization to graft and comb polymers - ScienceDirect