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Related to isotactic: Syndiotactic


Of or relating to a polymer in which the repeating units are all identically oriented.

[iso- + Greek taktos, arranged; see tactics in Indo-European roots + -ic.]


(Chemistry) chem (of a stereospecific polymer) having identical steric configurations of the groups on each asymmetric carbon atom on the chain. Compare syndiotactic


(ˌaɪ soʊˈtæk tɪk)

(of a polymer) having the same configuration at successive, regularly spaced positions.
[1950–55; iso- + tactic]
i`so•tac•tic′i•ty (-tækˈtɪs ɪ ti) n.
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References in periodicals archive ?
Recently, the technology of melt vibration has received considerable attentions due to its excellent ability of reducing polymer melt viscosity, eliminating melt defects, decreasing processing temperature and pressure, and enhancing mechanical properties [1-3], As a commodity polymer material, isotactic polypropylene (iPP) has been considered as the most suitable to study the effects of mechanical vibration and ultrasonic oscillation on polymers.
Surface-modified calcium carbonate particles by admicellar polymerization to be used as filler for isotactic polypropylene.
The madar fiber, a close relative of jute and hemp, was used as reinforcing filler for isotactic polypropylene for the first time, mainly due to the cost-effectiveness and natural abundance.
Treofan is developing these ultrathin capacitor films with a high level of thickness homogeneity, electrical field stressability, low energy losses and very good mechanical characteristics using Borealis' Borclean super pure, high isotactic polypropylene homopolymer with a novel polymer design.
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].
Polybutene-1 (PB-1) is a semi-crystalline, highly isotactic thermoplastic made from the polymerization of 1-butene using a Ziegler-Natta-type catalyst.
Unique chain-shuttling technology is used to make Dow Performance Plastics' INTUNE Olefin Block Copolymers (OBCs), which mix segments of crystalline isotactic polypropylene (PP) and crystalline polyethylene (PE) to make a polymer compatible with both.
Among the topics are the development of a hydrophobic microporous isotactic polypropylene membrane for a membrane contactor application, tensile properties and the degradability of a polyvinyl alcohol and starch succinate blend, flooding with biopolymer from microbes derived from mushrooms and cabbage to enhance the sweep efficiency in enhanced oil recovery, synthesizing hydroxyapatite with the sol-gel dip-coating method on a ceramic support, and potential technologies for decoloring batik wastewater.
In the 1950s, the historical achievements, which were subsequently awarded with the Nobel Prize, were reported concerning the helical structures of three different types of polymers, protein in 1951, (1) DNA in 1953 (2) and isotactic polypropylene in 1955.
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.