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Related to atactic: syndiotactic polymer


Of or relating to a polymer lacking structural regularity.

[a- + Greek taktikos, of order; see tactics.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Chemistry) chem (of a polymer) having random sequence of the stereochemical arrangement of groups on carbon atoms in the chain; not stereospecific
2. (Pathology) pathol relating to or displaying ataxia
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Adj.1.atactic - lacking motor coordination; marked or caused by ataxia
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References in periodicals archive ?
The content of atactic fraction, determined by fractionation in n-heptane, was found to be, about, 1 % wt, which is characteristic of effective isospecific metallocene systems.
In 5% of cases, symptoms of the central nervous system e.g., ptosis, depression, dementia, atactic gait, insomnia, personality changes and meningitis are reported [15].
Before the addition of the features, IHP incorrectly identified word phrases such as "36 schwannomas" (instead of "schwannomas") and "jerky movements" (instead of "atactic jerky movements").
The "Prima" series consist of plastomeric membranes modified with "Atactic Polypropylene" (APP).
The most poignant example for how structural configuration of these materials affected the LCST is poly(N-isopropyl acrylamide) (PNIPAM): a gradual decrease is recorded with increasing the isotacticity, and, for an isotactic (mm) triad, the insolubility in water appears to be over 72%, although the atactic (mr) PNIPAM is one of the representative water-soluble polymers [17].
Typical Glass-Transition Values Polymer Tg, C Nylon 6 47 Nylon 66 70 PE -80 Polyvinylidene fluoride -35 PP (atactic) -20 Polyvinyl fluoride -20 PP (isotactic) 0 Poly-3-hydroxybutyrate 15 Polyvinyl acetate 30 Polychlorotrifluoroethylene 45 Polylactic acid 60-65 PET 70 PVC 80 Polyvinyl alcohol 85 PS 95 Polymethyl methacrylate 105 ABS 105 Polytetrafluoroethylene 115 PC 145 Polvsulfone 185 Source: Wikipedia
atactic propylene/APP, styrene butadiene styrene/SBS, styrene isoprene styrene/ SIS, etc.)
Classification of volatile products evolved from the temperature-programmed co-pyrolysis of Turkish oil shales with atactic polypropylene (APP).
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).
The photoluminescence (PL) spectra for PPVA films exhibit broad emission bands which correspond to n [left arrow] [[pi].sup.*] electronic transition of the OH groups characteristic of three distinctive polymer configurations (isotactic, syndiotactic, and atactic) in the aqueous solution.