메뉴 건너뛰기




Volumn 283, Issue 5410, 1999, Pages 2059-2062

Chain walking: A new strategy to control polymer topology

Author keywords

[No Author keywords available]

Indexed keywords

ETHYLENE; PALLADIUM; POLYETHYLENE;

EID: 0033605733     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.283.5410.2059     Document Type: Article
Times cited : (721)

References (26)
  • 4
    • 30244557628 scopus 로고
    • D. A. Tomalia et al., Macromolecules 19, 2466 (1986); G. R. Newkome et al., J. Am. Chem. Soc. 108, 849 (1986); C. J. Hawker and J. M. J. Fréchet, J. Chem. Soc. Perkin Trans. 19, 2459 (1992).
    • (1986) Macromolecules , vol.19 , pp. 2466
    • Tomalia, D.A.1
  • 5
    • 33845373853 scopus 로고
    • D. A. Tomalia et al., Macromolecules 19, 2466 (1986); G. R. Newkome et al., J. Am. Chem. Soc. 108, 849 (1986); C. J. Hawker and J. M. J. Fréchet, J. Chem. Soc. Perkin Trans. 19, 2459 (1992).
    • (1986) J. Am. Chem. Soc. , vol.108 , pp. 849
    • Newkome, G.R.1
  • 6
    • 37049090938 scopus 로고
    • D. A. Tomalia et al., Macromolecules 19, 2466 (1986); G. R. Newkome et al., J. Am. Chem. Soc. 108, 849 (1986); C. J. Hawker and J. M. J. Fréchet, J. Chem. Soc. Perkin Trans. 19, 2459 (1992).
    • (1992) J. Chem. Soc. Perkin Trans. , vol.19 , pp. 2459
    • Hawker, C.J.1    Fréchet, J.M.J.2
  • 7
    • 0007137064 scopus 로고
    • Y. H. Kim and O. W. Webster, J. Am. Chem. Soc. 112, 4592 (1990); Macromolecules 25, 5561 (1992); C. J. Hawker, R. Lee, J. M. J. Fréchet, J. Am. Chem. Soc. 113, 4583 (1991).
    • (1990) J. Am. Chem. Soc. , vol.112 , pp. 4592
    • Kim, Y.H.1    Webster, O.W.2
  • 8
    • 0026929006 scopus 로고
    • Y. H. Kim and O. W. Webster, J. Am. Chem. Soc. 112, 4592 (1990); Macromolecules 25, 5561 (1992); C. J. Hawker, R. Lee, J. M. J. Fréchet, J. Am. Chem. Soc. 113, 4583 (1991).
    • (1992) Macromolecules , vol.25 , pp. 5561
  • 9
    • 0012925191 scopus 로고
    • Y. H. Kim and O. W. Webster, J. Am. Chem. Soc. 112, 4592 (1990); Macromolecules 25, 5561 (1992); C. J. Hawker, R. Lee, J. M. J. Fréchet, J. Am. Chem. Soc. 113, 4583 (1991).
    • (1991) J. Am. Chem. Soc. , vol.113 , pp. 4583
    • Hawker, C.J.1    Lee, R.2    Fréchet, J.M.J.3
  • 12
    • 0000950935 scopus 로고
    • In high-pressure free radical polymerization of ethylene, radical sites may be generated occasionally inside of polymer chains by chain transfer to polymer chains [T. Usami and S. Takayama, Macromolecules 17, 1756 (1984)]. However, the mechanism is completely different from the one discussed in this report, and the random radical chain transfer process cannot be regulated to control polymer topology.
    • (1984) Macromolecules , vol.17 , pp. 1756
    • Usami, T.1    Takayama, S.2
  • 16
    • 0031120212 scopus 로고    scopus 로고
    • S. J. McLain et al., Polymer Prep. 38 (no. 1), 772 (1997).
    • (1997) Polymer Prep. , vol.38 , Issue.1 , pp. 772
    • McLain, S.J.1
  • 17
    • 0344575236 scopus 로고    scopus 로고
    • note
    • A typical polymerization was done as follows: A solution of 50 mg (33.9 μmol) of the Pd-α-dimine catalyst in 100 ml of chlorobenzene was transferred into a 600-ml Parr pressure reactor under nitrogen. The reactor was heated to 35°C, and the solution was stirred by a mechanical stirrer set at 500 rpm. The reactor was pressurized with ethylene to 101.3 kPa. Polymerization was continued at 35°C and 101.3 kPa for 18.7 hours. After termination of the polymerization, the solution was diluted with toluene, then passed through a column packed with alumina, silica gel, and Celite to remove the catalyst, and finally precipitated into a large excess of methanol. The polymer was collected and dried in vacuo to give 15.8 g of PE as viscous oil.
  • 20
  • 26
    • 0344575232 scopus 로고    scopus 로고
    • note
    • We thank M. S. Brookhart, L. K. Johnson, M. Spinu, S. D. Ittel, L. Wang, Z. Yang, P. Soper, and S. D. Arthur for helpful discussions; R. E. Fuller for viscosity measurements; and J. Chen, J. Galperin, P. A. Ware, C. A. Urbston, and M. J. Halfhill for technical assistance.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.