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atactic
atactic, a. (əˈtæktɪk) [f. Gr. ἄτακτος not arranged (f. ἀ priv. + τακτός, vbl. adj. f. τάσσ-ειν to arrange) + -ic.] 1. Of language: not syntactic.1842 Chamb. Jrnl. 30 July 218 In this manner syntactic and atactic forms have been respectively formed. 2. Path. Of or pertaining to or afflicted with ata...
Oxford English Dictionary
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Amorphous poly alpha olefin
Amorphous poly alpha olefin (APAO; also known as atactic poly alpha olefin) is a commodity chemical used in multiple applications. History
In the mid-to-late-1950s, atactic polypropylene (APP) was a by-product of the synthesis of isotactic polypropylene (iPP) using first and early
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syndiotactic
syndiotactic, a. Chem. (ˌsɪndaɪəʊˈtæktɪk) Also (more correctly) syndyo-. [f. Gr. σύνδυο two together + τακτ-ός arranged, ordered + -ic.] Having or designating a polymer structure in which the substituent groups alternate on either side of the backbone of the molecule.1956 Natta & Corradini in Jrnl. ...
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Thermoplastic olefin
Structure
The geometry of the metallocene catalyst will determine the sequence of chirality in the chain, as in, atactic, syndiotactic, isotactic, as
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stereoregular
stereoregular, a. Chem. (stɛriːəʊ-, stɪəriːəʊˈrɛgjʊlə(r)) Also stereo-regular. [f. stereo- + regular a.] Of a polymer: having each substituent atom or group on the main polymer chain oriented in the same manner on the chain with respect to the neighbouring atoms or groups. Of a reaction: giving rise...
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Polypropylene
Atactic polypropylene (aPP)
Atactic polypropylene is amorphous and has therefore no crystal structure. Atactic polypropylene is an amorphous rubbery material.
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stereoregulate
stereoregulate, v. Chem. (stɛriːəʊ-, stɪəriːəʊˈrɛgjʊleɪt) [f. stereo- + regulate v.] trans. To cause (a polymerization or its product) to be stereoregular. So ˌstereoˈregulated ppl. a., -ˈregulating vbl. n. and ppl. a.; ˌstereoreguˈlation.1959 Gaylord & Mark Linear & Stereoregular Addition Polymers ...
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Ansa-metallocene
in the synthesis of polypropylene in the presence of methylaluminoxane (MAO) can be used to direct whether the product is syndiotactic, isotactic, or atactic
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stereoblock
ˈstereoblock Chem. [ad. It. stereoblocchi (G. Natta et al. 1957, in Chim. e Industr. XXXIX. 276/2): see stereo- and block n.] A segment of a polymer chain possessing stereoregularity. Also attrib., as stereoblock polymer, a polymer the chains of which contain such segments.1957 Chem. Abstr. LI. 1253...
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Adhesive tape
The laminating adhesive had previously been asphalt but now is more commonly a hot-melt atactic polypropylene.
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neocerebellum
neocerebellum Anat. (niːəʊsɛrɪˈbɛləm) [mod.L., f. neo- 1 e + cerebellum.] The phylogenetically youngest portion of the cerebellum, comprising mainly its lateral lobes (‘hemispheres’).1925 W. H. F. Addison tr. Villiger's Brain & Spinal Cord (ed. 3) 80 The hemispheres constitute the neocerebellum, and...
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Polypropylene glycol
Conventional polymerization of propylene oxide results in an atactic polymer.
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stereospecific
stereospecific, a. Chem. (ˌstɛriːəʊ-, ˌstɪəriːəʊspɪˈsɪfɪk) Also stereo-specific. [f. stereo- + specific a.] 1. a. Of a reaction: = stereoselective a. Also of a catalyst: causing a reaction to be (more) stereoselective.1949 Jrnl. Amer. Chem. Soc. LXXI. 3866/2 The reaction giving rise to the acetates ...
Oxford English Dictionary
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Polyacrylic acid
For this reason, acrylic acid exists in atactic, syndiotactic, and isotactic forms, although this aspect is rarely discussed.
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Parisa Mehrkhodavandi
racemic lactide into a highly heterotactic polylactic acid and how the indium complex along with the chiral ligand polymerizes meso-lactide into virtually atactic
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