Effect of Ester Compounds on Stereospecificity in Methacrylate Polymerization with t-Butyllithium/Bis(2,6-di-t-butylphenoxy)methylaluminum
作者： Tomohiro Hirano , Tatsuki Kitayama , Koichi Hatada
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摘要: Polymerization of methacrylates with t-butylithium/bis(2,6-di-t-butylphenoxy)methylaluminu: in toluene at low temperature gives heterotactic polymers which comprise an alternating sequence meso (m) and racemo (r) diads. In this paper, the effect addition non-polymerizable esters on stereoselectivity polymerization was examined. methyl methacrylate, either bulky or less scarcely affects propagating anions. contrast, such as ethyl pivalate methacrylate (EMA) increased heterotactic-selectivity m-ended anions slightly without sacrificing high r-ended anions, while isobutyrate decreased drastically a slight increase The use component mixed solvent - 95°C improved both giving poly(EMA) mr=94%.
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sci-hub.se 参考文章(17)
Vincenzo Busico, Paolo Corradini, Luigi De Martino, Antonio Proto, Enrico Albizzati, Polymerization of propene in the presence of MgCl2-supported Ziegler-Natta catalysts, 2. Effects of the co-catalyst composition† Macromolecular Chemistry and Physics. ,vol. 187, pp. 1115- 1124 ,(1986) , 10.1002/MACP.1986.021870508
Helmut Schlaad, Axel H. E. Müller, Effect of bulkiness and lewis acidity of aluminium compounds on the anionic polymerization of methyl methacrylate in toluene Macromolecular Symposia. ,vol. 107, pp. 163- 176 ,(1996) , 10.1002/MASY.19961070116
Sadahito Aoshima, Toshinobu Higashimura, Living cationic polymerization of vinyl monomers by organoaluminum halides. 3. Living polymerization of isobutyl vinyl ether by ethyldichloroaluminum in the presence of ester additives Macromolecules. ,vol. 22, pp. 1009- 1013 ,(1989) , 10.1021/MA00193A001
Tatsuki Kitayama, Tomohiro Hirano, Koichi Hatada, REMARKABLE EFFECT OF STRUCTURE OF BULKY ALUMINUM PHENOXIDES ON STEREOSPECIFICITY OF METHACRYLATE POLYMERIZATION Tetrahedron. ,vol. 53, pp. 15263- 15279 ,(1997) , 10.1016/S0040-4020(97)00962-9
Tatsuki Kitayama, Tetsunori Shinozaki, Takashi Sakamoto, Masanori Yamamoto, Koichi Hatada, Living and highly syndiotactic polymerization of methyl methacrylate and other methacrylates by tert-butyllithiumtrialkylaluminium in toluene Die Makromolekulare Chemie. ,vol. 15, pp. 167- 185 ,(1989) , 10.1002/MACP.1989.020151989116
Tatsuki Kitayama, Yajun Zhang, Koichi Hatada, Preparation of heterotactic-rich poly(methyl methacrylate) with narrow molecular weight distribution by tert -butyllithium/bis(2,6-di- tert -butylphenoxy)methylaluminum Polymer Bulletin. ,vol. 32, pp. 439- 446 ,(1994) , 10.1007/BF00587886
Masahiro Kakugo, Tatsuya Miyatake, Yukio Naito, Kooji Mizunuma, Microtacticity distribution of polypropylenes prepared with heterogeneous Ziegler-Natta catalysts Macromolecules. ,vol. 21, pp. 314- 319 ,(1988) , 10.1021/MA00180A006
Helmut Schlaad, Axel H. E. Müller, Heinz Kolshorn, Mechanism of anionic polymerization of (meth)acrylates in the presence of aluminium alkyls, 1. 13C NMR studies of model compounds in toluene Macromolecular Rapid Communications. ,vol. 15, pp. 517- 525 ,(1994) , 10.1002/MARC.1994.030150611
Tomohiro Hirano, Hiroko Yamaguchi, Tatsuki Kitayama, Koichi Hatada, Heterotactic Polymerization of Methacrylates Having C-3 Ester Group Polymer Journal. ,vol. 30, pp. 767- 769 ,(1998) , 10.1295/POLYMJ.30.767
Helmut Schlaad, Bardo Schmitt, Axel H. E. Müller, Stephan Jüngling, Horst Weiss, Mechanism of Anionic Polymerization of (Meth)acrylates in the Presence of Aluminum Alkyls. 5. Effect of Lewis Bases on Kinetics and Molecular Weight Distributions Macromolecules. ,vol. 31, pp. 573- 577 ,(1998) , 10.1021/MA971112M