Abstract
A dendrimer carbosilane containing 32 Si-Cl bonds in the perimeter has been prepared and has been used as a coupling agent to prepare 32-arm star polybutadienes. The dilute-solution properties 〈R G 2 〉, A 2 , [η], and D 0 have been measured in one good solvent and in one θ-solvent. The dimensions of the 32-arm star polymers are compared with those of linear polymers at constant molecular weight. It is shown that the 32-arm star polybutadiene has the characteristic properties of a hard-sphere molecule in dilute solution. The equivalent hard-sphere radii calculated from A 2 , D 0 and [η] are identical and 1.29 times larger than the root mean-square radius of gyration. The Daoud-Cotton scaling model for stars is also tested.
Original language | English (US) |
---|---|
Pages (from-to) | 303-314 |
Number of pages | 12 |
Journal | Rubber Chemistry and Technology |
Volume | 65 |
Issue number | 2 |
DOIs | |
State | Published - Jan 1 1992 |
ASJC Scopus subject areas
- Polymers and Plastics
- Materials Chemistry