syndiotacticadj.

/ˌsɪndʌɪəʊˈtaktɪk/

Forms: Also (more correctly) syndyo-.

Etymology: < Greek σύνδυο two together + τακτός arranged, ordered + -ic suffix.

Chemistry.

Having or designating a polymer structure in which the substituent groups alternate on either side of the backbone of the molecule.

ΘΚΠ

the world > matter > chemistry > polymer chemistry > polymers > [adjective] > stereochemical properties

volumeless1946

isotactic1955

syndiotactic1956

stereoregular1959

stereoregulated1959

stereoregulating1959

stereospecific1959

1956 Natta & Corradini in Jrnl. Polymer Sci. XX. 262 We propose to call all vinyl polymers with alternating d- and l-configurations of their substituents (like 1,2-polybutadiene) ‘syndyotactic’ polymers.

1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) X. 478/2 Isotactic and syndyotactic (stereoregular) polymers are formed in the presence of complex catalysts.

1972 Physics Bull. Nov. 668/3 The cellulose molecule..is syndiotactic and hence able to crystallize.

1978 Nature 9 Feb. 508/2 Commercial atactic polystyrene..is 70% syndiotactic.

Derivatives

ˌsyndioˈtactically adv.

ΘΚΠ

the world > matter > chemistry > polymer chemistry > polymers > [adverb] > stereochemical properties

syndiotactically1964

1964 Jrnl. Polymer Sci. B. 2 319 Predominantly isotactic addition may occur on heterogeneous surfaces, accompanied by conversion of the active complexes to form different..catalyst sites, which propagate predominantly syndiotactically.

ˌsyndiotacˈticity n. the property or state of being syndiotactic.

ΘΚΠ

the world > matter > chemistry > polymer chemistry > polymers > [noun] > stereo-chemical properties > syndiotacticity

syndiotacticity1959

1959 Jrnl. Polymer Sci. 34 9 Syndiotacticity is the corresponding arrangement. We can think of it as composed of positional and structural arrangements identical to those of isotacticity (repetition arrangements) and of a tacticity opposite to that of isotacticity (inversion tacticity).

1974 Nature 26 Apr. 758/1 If there is a high degree of syndiotacticity, a structure incorporating four monomer units per fibre repeat may be present.

This entry has not yet been fully updated (first published 1986; most recently modified version published online December 2020).

单词	syndiotactic
释义	syndiotacticadj. /ˌsɪndʌɪəʊˈtaktɪk/ Forms: Also (more correctly) syndyo-. Etymology: < Greek σύνδυο two together + τακτός arranged, ordered + -ic suffix. Chemistry. Having or designating a polymer structure in which the substituent groups alternate on either side of the backbone of the molecule. ΘΚΠ the world > matter > chemistry > polymer chemistry > polymers > [adjective] > stereochemical properties volumeless1946 isotactic1955 syndiotactic1956 stereoregular1959 stereoregulated1959 stereoregulating1959 stereospecific1959 1956 Natta & Corradini in Jrnl. Polymer Sci. XX. 262 We propose to call all vinyl polymers with alternating d- and l-configurations of their substituents (like 1,2-polybutadiene) ‘syndyotactic’ polymers. 1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) X. 478/2 Isotactic and syndyotactic (stereoregular) polymers are formed in the presence of complex catalysts. 1972 Physics Bull. Nov. 668/3 The cellulose molecule..is syndiotactic and hence able to crystallize. 1978 Nature 9 Feb. 508/2 Commercial atactic polystyrene..is 70% syndiotactic. Derivatives ˌsyndioˈtactically adv. ΘΚΠ the world > matter > chemistry > polymer chemistry > polymers > [adverb] > stereochemical properties syndiotactically1964 1964 Jrnl. Polymer Sci. B. 2 319 Predominantly isotactic addition may occur on heterogeneous surfaces, accompanied by conversion of the active complexes to form different..catalyst sites, which propagate predominantly syndiotactically. ˌsyndiotacˈticity n. the property or state of being syndiotactic. ΘΚΠ the world > matter > chemistry > polymer chemistry > polymers > [noun] > stereo-chemical properties > syndiotacticity syndiotacticity1959 1959 Jrnl. Polymer Sci. 34 9 Syndiotacticity is the corresponding arrangement. We can think of it as composed of positional and structural arrangements identical to those of isotacticity (repetition arrangements) and of a tacticity opposite to that of isotacticity (inversion tacticity). 1974 Nature 26 Apr. 758/1 If there is a high degree of syndiotacticity, a structure incorporating four monomer units per fibre repeat may be present. This entry has not yet been fully updated (first published 1986; most recently modified version published online December 2020). < adj.1956
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