tacticity

(redirected from Stereoregularity)

tacticity

(tækˈtɪsɪtɪ)
n
(Chemistry) the quality of regularity in the arrangement of repeated units within a polymer chain
Translations
tacticité
References in periodicals archive ?
that the stereoregularity of the polymer depends on your route of obtaining [23] and the stereospecificity of the enzyme responsible for the polymerization of the monomer [38].
Furthermore, the almost perfect stereoregularity attained gives rise to a characteristic viscoelastic response and viscosity values several times higher than iPP [14].
Because of this high degree of stereoregularity they are able to crystallize on stretching [1].
Degradation of PVA is quite slow and largely depends upon such structural properties as the degree of polymerization and hydrolysis, distribution of hydroxyl groups, stereoregularity and crystallinity [4].
patent application for a "Process for the Preparation of High Performance Polypropylene," described as using "highly stereo specific Ziegler-Natta catalyst" to make PP with broad MWD and a high MW fraction with low isotacticity or stereoregularity, using "asymmetrical external donor" technology instead of comonomers.
It comprises at least one layer with a first material that is very highly crystalline polypropylene homopolymer (VHCPP), which has a very high intermolecular stereoregularity consisting of at least about 98% of isotactic polymer.
They are characteristic also of stereoregularity, molecular conformation, and molecular orientation and ordering.
Focus areas where metallocene products are expected to differentiate themselves include branching, sequence distribution and stereoregularity.
Today, they are being commercialized by Exxon and others as catalysts which, unlike their heterogeneous predecessors, produce polymers with an unprecedented degree of molecular weight uniformity and stereoregularity.
Synthesis of Well-Defined Poly(meth)acrylamides with Varied Stereoregularity by Living Anionic Polymerization
Since both molecular weight and stereoregularity differences do not cause any change in relaxation parameters, one can consider that the changes associated to the plasticization reveal a strong modification of the amorphous phase organization.
By weakening the interaction of the chain molecules in PA11 and relaxing the stereoregularity of their organization," explains Fujitsu, it created a bioplastic with sufficient flexibility to withstand repeated bending without the whitening common in such materials.