Polymerization of 1,5-hexadiene by half-titanocenes-MAO catalyst systems: Factors affecting the selectivity for the favored repeated 1,2-insertion

Macromolecules

Volumn 39, Issue 12, 2006, Pages 4009-4017

  Nomura, Kotohiro ^a   Takemoto, Arimitsu ^a   Hatanaka, Yumiko ^a   Okumura, Hiroshi ^b   Fujiki, Michiya ^a   Hasegawa, Kiichi ^b  

^a NARA INSTITUTE OF SCIENCE AND TECHNOLOGY   (Japan)

^b OSAKA MUNICIPAL TECHNICAL RESEARCH INSTITUTE   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

CATALYSTS; DYNAMIC MECHANICAL ANALYSIS; GLASS TRANSITION; MICROSTRUCTURE; MOLECULAR WEIGHT; POLYMERIZATION; THERMOGRAPHY (TEMPERATURE MEASUREMENT);

ANIONIC ANCILLARY DONOR LIGANDS; METHYLALUMINOXANE (MAO); OLEFINIC DOUBLE BOND (BUTENYL GROUP); THERMOGRAMS;

TITANIUM COMPOUNDS;

EID: 33745791513     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma0604892     Document Type: Article

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77. g = 24.60°C.
78. 17
79. n values vs polystyrene standards by GPC were higher than those estimated values if internal olefins were formed only by the β-hydrogen elimination. The reason for the low catalytic activity by 2 may be due to stabilization by coordination of internal olefin after the isomerization.
80. 2=CHR) as the polymer chain end was observed in poly(ethylene-co-2M1P)s (2M1P: 2-methyl-l-pentene) prepared by 1 under high 2M1P concentration conditions (for the copolymer with high 2M1P content), and this clearly suggests that 2M1P insertion in the copolymerization takes place in 1,2-insertion mode, and the chain transfer in the copolymerization is due to the β-hydrogen elimination after 2,1-insertion (misinsertion): Nomura, K.; Itagaki, K., unpublished results. The result also suggests that the present HD polymerization by 1 took place in the preferred 1,2-insertion.
81. 17 This is because use of DDMAS should be favored over CPMAS to estimate the contents quantitatively.
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84. n = 3.27, run 54). Moreover, since the E′ value at the rubbery plateau was somewhat higher than those for poly(HD)s prepared by 1 and 6 and also since the content of olefinic double bonds in the polymer was close to that by 1 under the same conditions (7a and e), these results should suggest that some extent of cyclization took place in addition to cross-linking. These results should also indicate that the selectivity was affected by both cyclopentadienyl and anionic ancillary donor ligand employed.
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