Facile controlled synthesis of soluble star shape polymers by ring-opening metathesis polymerization (ROMP)

Macromolecules

Volumn 42, Issue 4, 2009, Pages 899-901

  Nomura, Kotohiro ^a   Watanabe, Yu ^a   Fujita, Sakiko ^a   Fujiki, Michiya ^a   Otani, Hisaki ^a  

^a NARA INSTITUTE OF SCIENCE AND TECHNOLOGY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

ALKYLIDENE; CONTROLLED SYNTHESIS; CYCLIC OLEFINS; MULTIBLOCK; RING OPENING METATHESIS POLYMERIZATION;

DICHLOROMETHANE; MOLYBDENUM; OLEFINS; ORGANIC POLYMERS; POLYMERS; RING OPENING POLYMERIZATION; SYNTHESIS (CHEMICAL); TOLUENE;

ORGANIC SOLVENTS;

EID: 66549119062     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma8027529     Document Type: Review

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64. Detailed experimental procedures, additional polymerizations results, and selected GPC charts are shown in the Supporting Information.
65. n = 1.16), the ROMP of norbornene (NBE) with imperfect conversion (at the first stage) seems to be important for obtainment of soluble polymer with uniform distribution, This would be probably because that the subsequent (co)polymerization of (residual, small amount of) NBE and CL (affording relatively a large core) seems to be effective to improve the solubility and would lead uniform reactivity (of the propagating alkylidenes) in the subsequent ROMP (third polymerization forming NBE branching).
66. n value of linear poly(NBE) [increasing 25 NBE repeating units, 2354 by molecular weight, and ca. 4000 (by GPC vs polystyrene standards) from ref 16]. The value (34 000/4000 = 8.5, total number of arms from first and third polymerization was assumed as 16-18) suggests that the resultant polymers are star polymers consisting of a core and NBE branching.
67. Additional explanation including additional micrographs for the resultant polymers by TEM, STEM AFM, and data analyses are shown in the Supporting Information.