isotactic


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Related to isotactic: Syndiotactic

isotactic

[¦ī·sə¦tak·tik]
(organic chemistry)
Designating crystalline polymers in which substituents in the asymmetric carbon atoms have the same (rather than random) configuration in relation to the main chain.
References in periodicals archive ?
At K'95, Hoechst announced the production on a commercial scale in Europe of the Hostacen metallocene-based isotactic propylene.
pointed out that miscibility between isotactic PP and PEB depended on the butene content in the PEB (43).
For instance, commercial TPVs based on isotactic PP, EPDM and mineral oil show limited elastic recovery when repeatedly stretched to higher elongations ([is greater than]200%).
Syndiotactic PP homopolymer is normally lower in molecular weight than isotactic PP for the same melt flow, and much less crystalline: 20-30% crystalline for sPP vs.
The phase and crystal morphologies of isotactic polypropylene/acrylonitrile-styrene copolymer (iPP/SAN) blend part molded via water-assisted injection molding (WAIM) were investigated, and their formation mechanisms were analyzed with the aid of numerically simulated stress and temperature fields occurring during the WAIM.
It forms crystalline nanofibres (approx 5nm diameter) when it precipitates out of a hot melt of isotactic PP (iPP).
Joint Effects of Molecular Structure and Processing History on Specific Nucleation of Isotactic Polypropylene, Macromolecules, 42, 7413-7417, ISSN 0024-9297
PVC resins have what is called a linear isotactic structure, the chlorine is always on the same side of the carbon atom, causing crystallization within the PVC polymer.
The Russian researchers also explore thermo-mechanical destruction of polypropylene, polymer nanocomposite reinforcement, the fractal-like kinetics of the re-esterification reaction with a catalyst, and the structure and thermo-oxidation of polymer blends of isotactic polypropylene and triple ethylenepropylenediene.
Candidate at the Louisiana State University AgCenter, Baton Rouge, LA, was awarded first place in the 2006 Wood Award competition for his paper titled Argon- and Oxygen-Based Plasma Treatment Effects at the Thermomechanical Pulp Fiber and Isotactic Polypropylene Interface.
In particular, blends of isotactic and atactic polypropylenes (iPP and aPP) were studied.