Premium
Synthesis, Characterization, and Investigation of Thermosensitive Star‐Shaped Poly(2‐isopropyl‐2‐oxazolines) Based on Carbosilane Dendrimers
Author(s) -
Amirova Alina,
Rodchenko Serafim,
Makhmudova Zhanna,
Cherkaev Georgij,
Milenin Sergey,
Tatarinova Elena,
Kurlykin Mikhail,
Tenkovtsev Andrey,
Filippov Alexander
Publication year - 2017
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201600387
Subject(s) - dendrimer , isopropyl , polymer chemistry , polymerization , degree of polymerization , chemistry , folding (dsp implementation) , macromolecule , phase (matter) , materials science , polymer , organic chemistry , biochemistry , electrical engineering , engineering
Star‐shaped poly(2‐isopropyl‐2‐oxazolines) with dramatically hydrophobic dendrimer core are synthesized using carbosilane dendrimers of first to third generations as macroinitiators. It is observed that half of the initiator functional groups are incorporated in polymerization process. The polymerization degree of polyoxazoline arms is about 25. Strong arm folding results in small molecule dimensions in both aqueous and organic solutions. Thermosensitive properties are studied for second generation‐based star solution with the concentration of 0.00095 g cm −3 . Model linear poly(2‐isopropyl‐2‐oxazolines) are investigated for comparison. Carbosilane dendrimer core interaction leads to the formation of different types of aggregates at low temperatures. The temperatures of the beginning ( T 1 = 42–43 °C) and finishing ( T 2 = 50 °C) of phase separation are determined. It is shown that macromolecule compactization and aggregation take place even far from the phase transition interval and alternately prevail on heating.