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 ?
As spun isotactic polypropylene fibers of 2060 Tex and melt flow index (MFI) of 27.84 g/10 min were used.
isotactic PP, with thumbs on one side like a comb); Mitsui Chemicals; and Chisso polypropylene, now part of Mitsubishi Chemical.
Bevis, "Injection molding of isotactic polypropylene," in Polypropylene, Polymer Science and Technology Series, J.
Mechanical Properties of Injection Molded Isotactic Polypropylene/Roselle Fiber Composites, J.
For both methylene regions, a relative fraction of the isotactic orientation can be observed.
Triphenylmethyl methacrylate (TrMA) is a unique monomer that forms an isotactic polymer, PTrMA, even by a radical process, (11) which usually yields atactic or syndiotactic polymers.
Key statement: Disclosed is an ethylene-propylene-diene terpolymer having isotactic polypropylene crystallinity compounded with a blend rubber wherein the terpolymer can be present in an amount effective to improve tack, aged tensile strength retention, fatigue resistance, ozone cracking resistance and reversion resistance.
At earlier stage (1h) of the reaction, molar ratios of isotactic (mm), atactic (mr), and syndiotactic (rr) pHEMA were 39, 13, and 48 mol%, respectively (Table 1).
In contrast, an isotactic stereoblock (bottom) polymer has a higher melting point.
or isotactic configuration) are used to prepare adhesives of the present invention.
Joint Effects of Molecular Structure and Processing History on Specific Nucleation of Isotactic Polypropylene, Macromolecules, 42, 7413-7417, ISSN 0024-9297