Copolymerizationof Caprolactone Isomers to Obtain Nanoparticles with Constant Hydrophobicityand Tunable Crystallinity
2020
To obtain a set of
polycaprolactones (PCL) with varying crystallinity, the triazabicyclodecene-catalyzed
copolymerization of the two constitutional isomers e-caprolactone
(eCL) and δ-caprolactone (δCL) was carried out at
room temperature in toluene. Variation of the feed fraction of eCL
from 50% to 80% and the detailed kinetic studies accompanied by application
of terminal as well as nonterminal kinetic models suggested the formation
of random copolymers. Differential scanning calorimetry and wide-angle
X-ray scattering investigations revealed the decrease of melting temperatures
and degree of crystallinity with the eCL fraction in the PCL.
All copolymers were suited to obtain aqueous nanoparticle dispersions
by means of nanoprecipitation. Encapsulation of the fluorescent probe
pyrene confirmed a constant hydrophilic/hydrophobic balance of the
nanoparticles.
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