Molecular characteristics of poly(propylene imine) dendrimers as studied with translational diffusion and viscometry |
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| Authors: | G M Pavlov E V Korneeva E W Meijer |
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| Institution: | (1) Institute of Physics of St. Petersburg State University, Ulianovskaya str.1 198504 St. Petersburg, Russia e-mail: gpolym@onti.niif.spb.su, RU;(2) Institute of Macromolecular Compounds of RAS, Bolshoi 31 199004 St. Petersburg, Russia, RU;(3) Laboratory of Macromolecular and Organic Chemistry Eindhoven University of Technology P.O. Box 513, 5600 MB Eindhoven The Netherlands, NL |
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| Abstract: | The generation of dendrimers based on poly(propylene imine) with CN end groups DAB–dend–(CN)
x
] and with palmitoyl end groups DAB–dend–(C15)
x
] was studied by methods of translational diffusion and viscometry. The volumes of the DAB–dend–(CN)
x
and DAB–dend–(C15)
x
dendrimers and the previously studied DAB–dend–(lacto)
x
dendrimer were compared to evaluate the volumes of the end groups in hybrid dendrimers. The volume of the hybrid dendrimers
compared to that of the initial dendrimers increases proportionally to the number of end groups: this means that the end groups
are predominantly located on the periphery of each molecule, thus ensuring this volume will increase. It is shown that the
volume of the end groups for DAB–dend–(C15)
x
is 3.5 times greater, and for DAB–dend–(lacto)
x
it is 5.0 times greater than that occupied by free mole- cules corresponding to the end groups. The values of the intrinsic
viscosity were compared with the values of the diffusion coefficient and the chemical formula molecular weight.
Received: 7 August 2001 Accepted: 2 November 2001 |
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| Keywords: | Dendrimers Hydrodynamic properties Volume of end groups |
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