ãã°ã©ãŒç³»è§Šåªã«ãã α-ã¡ãã« ã¹ã ã¬ã³ã®éå ãšçæ ã ãªããŒã®æ§è³ª ã429ã
Polymerization of a-Methylstyrene by Ziegler Catalyst and
Properties of the Polymers Obtained
III. Polymerization of a-Methylstyrene with VariousAlkylaluminums and TiCl, Catalyst Systems
By Yutaka Sakurada*, Kiyokazu Imai*, andMasakazu Matsumoto*
The polymerization of a-methylstyrene initiated by AlEt,Cl3-n,(n=1,2)-TiCI4 systems or
AlR3-TiCl4 systems of different size R (alkyl group) at -78â¢Åœ was studied. For AlEtnCl3,
AlEtC12 and AlEt2C1, and for AiR3, AlEt3, Al(i-Bu)3 and Al(Hex)3 were used respectively. The
conversion and the degree of polymerization (DP) at a definit time are influenced distinctly
by the kinds of alkylaluminums and by the aging conditions of the catalyst systems. The
order of catalyst activity defined by the DP of the polymers are as follows :
AlMes>AlEt3>AIEt2Cl>AlEtC12> Al(Hex)3>Al(i-Bu)3
(aged at 0â¢Åœ for 10min)
AlMe3>AlEt2C1>AlEtC12>Al(Hex)3>AlEt3>Al(i-Bu)3
(aged at -78â¢Åœ for 10min)
The corresponding DP varied within the range from 500 to 3000 for the first series and from
800 to 5000 for the second series respectively. It is speculated that the cause of the above
mentioned phenomena due to the different counter anions of active species. The structure of
the active species are discussed on the basis of the reaction process of A1R3 or A1EtaCl3-n
with TiCl4.
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(1962幎12æ14æ¥ åç)
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* Research Laboratory , Kurashiki Rayon Co. (Sakazu, Kurashiki, Okayama)**å æ· ã¬ã€ ãšã³æ ªåŒäŒç€Ÿç 究æ(岡 å±±çåæ·åžé 接1621)
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Fig. 2. Volume-temperature relationships.
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Table 1. Glass transition temperature of poly-a-methylstyrene
obtained with various catalyst.
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Z-14-762,B-31,KM44ã æ¯èŒããã° ãã ãããã«
%1ã« ã€ã㊠ãTg2ã« ã€ããŠãAIEt3-TiCl4觊 åªéå
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in the range between 910 cm-1 and 800 cm-1.
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Table 2. Densities of poly-Æ¿-methylstyrene obtained with various catalyst.
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Table 3. Solubility of poly-a-methylstyrene
in methyl ethyl ketone.
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ã ããçŠå³¶ä¿®æ°ã«æè¬ã ãããªãæ¬ç 究ã¯ç¬¬11å é«åååŠäŒ
幎次倧 äŒ(1962幎5æ,å å€å±)㧠çºè¡š ããã
ãã° ã©ãŒç³»è§Šåª ã«ãã α-ã¡ãã«ã¹ã ã¬ã³ã®éå ãšçæ ã ãªããŒã®æ§è³ª ã435ã
æ ç®
1) Y. Sakurada: J. Polymer Sci., in press; æ¡ ç°
æŽ: é« ååèšè«äŒ(1961幎11æ,æ± äº¬)è¬æŒèŠ æš
é, 222
2) J. Lal: J. Polymer Sci., 31, 179(1958); E. J.Vandenberg, R. F. Heck, D. S. Breslow: J.Polymer Sci., 41, 519 (1959); G. Natta, et al:Angew. Chem., 71, 205(1959)
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5) ææ© ä¿ä», éæ¡ ä¿äž, ç°æ å®è¡: Bull. Chem.
Soc., Japan, 32, 534 (1959)
6) æ¡ ç° æŽ, ææéä», ä»äºæž å: 第11å é« åå
åŠ äŒå¹Žæ¬¡å€§äŒ(1962幎5æ,å å€å±)è¬ æŒèŠæšé,
93
7) æ¡ ç° æŽ, 西岡節倫, æŸæ¬ æäž, å è€åå, ä»äº
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Polymerization of a-Methylstyrene by Means of Ziegler
Catalyst and the Properties of Polymers Obtained
IV. Properties of Poly-a-Methylstyrene Prepared withVarious Catalysts.
By Yutaka Sakurada*, Kiyokazu Imai*, andMasakazu Matsumoto*
Properties of poly-a-methylstyrene by AlEt3-TiC14 at -78â¢Åœ were compared from the
standpoint of the stereoregularity with those of poly-a-methylstyrene by BF3â¢EOEt2 and TiCl4
at -78â¢Åœ, and by metallic Na and K at room temperature. Since crystallization of these
polymers is very difficult, glass transition temperature, infrared absorption spectrum, density
and solubility were measured in amorphous state. Some differences depending on the poly-
merization conditions were observed in glass transition temperature and infrared spectrum.
The glass transition temperature of the polymer prepared with AlEt3-TiC14 catalyst is 117â¢Åœ,
and that of the polymer prepared with metallic K catalyst is 107â¢Åœ. (The degree of poly-
merization of both polymers is ca. 3000) The intensity of absorption peak at 885 cm-1 in the
infrared absorption spectrum is affected by the polymerization conditions. These differences
may result from differences in the stereoregularity of the polymer. The density is 1.0610+
0.0005 independent of polymerization conditions. However, when the polymer is heated above
the glass transition temperature, it changes to 1.0630â¢}0.0005. The solubility in methyl ethyl
ketone depends on the polymerization conditions, but the relationship between the solubility
and the stereoregularity of the polymer is not clear. The following shows the order of
catalyst activity defined by the stereoregularity estimated from the results of glass transition
temperature and infrared spectrum.
" The stereoregularity " used here may mean " the isotacticity ."
* Research Laboratory , Kurashiki Rayon Co. (Sakazu, Kurashiki, Okayama)