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Stereochemical regulation of polypropylenes prepared with various Ziegler-Natta catalysts (1974)

Mitani, Katsuo ; Suzuki, Toshimitsu ; Matsuo, Akihiro ; [et al.]

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 771-784

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ISSN: 0360-6376

Keywords: Physics ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The 220-MHz proton magnetic resonance and infrared spectra of stereoregular polypropylenes polymerized with a number of Ziegler-Natta catalysts and isotactic polymers of low molecular weight obtained by thermal degradation of a highly isotactic polypropylene were measured in an attempt to obtain some information on the local regularity. The fraction of thermally degraded polymer soluble in diethyl ether shows stereorandomness (tactie sequence length is quite short), and the portion soluble in n-pentane has stereoblock character. The results so obtained provide strong evidence that racemic dyads of whole polymer consist of two models of racemic dyad isolated and racemic dyads in groups. The polymers prepared with vanadium catalyst systems show stereorandom character and these polymers have \documentclass{article}\pagestyle{empty}\begin{document}$\hbox{-\hskip-1pt-}\hskip-4pt({\rm CH}_2 \rlap{--} )$\end{document} groups formed by two propylene units in a tail-to-tail linkage. Syndiotactic polypropylene has head-to-head and tail-to-tail arrangements of two propylene units and this is the origin of randomness of syndiotacticity.

Additional Material: 6 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/pol.1974.170120407

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220 MHz NMR spectra of propylene-butadiene alternating copolymers an evidence of alternating sequences (1971)

Suzuki, Toshimitsu ; Takegami, Yoshinobu ; Furukawa, Junji ; [et al.]

New York : Wiley-Blackwell

Journal of Polymer Science Part B: Polymer Letters 9 (1971), S. 931-939

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ISSN: 0449-2986

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 5 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/pol.1971.110091212

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220 MHz NMR spectra of polybutene-1 (1972)

Suzuki, Toshimitsu ; Koshiro, Satoru ; Takegami, Yoshinobu

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Letters Edition 10 (1972), S. 829-833

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ISSN: 0360-6384

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 4 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/pol.1972.130101102

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220 MHz NMR spectra of propylene-ethylene copolymers (1971)

Takegami, Yoshinobu ; Suzuki, Toshimitsu

New York : Wiley-Blackwell

Journal of Polymer Science Part B: Polymer Letters 9 (1971), S. 109-113

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ISSN: 0449-2986

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 2 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/pol.1971.110090207

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220 MHz NMR spectra of polybutene-1 (1972)

Suzuki, Toshimitsu ; Koshiro, Satoru ; Takegami, Yoshinobu

New York : Wiley-Blackwell

Journal of Polymer Science Part B: Polymer Letters 10 (1972), S. 829-833

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Details

ISSN: 0449-2986

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 4 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/pol.1972.110101102

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