Abstracts Book - IMRC 2018

• SB1-O033
THERMALLY-TRIGGERED ACTUATORS BASED ON OLIGO(ω-
PENTADECALACTONE) HYBRID NANOCOMPOSITES
Muhammad Yasar Razzaq 1 , Marc Behl 2 , Andreas Lendlein 3,4
1 Helmholtz Zentrum Geesthacht, Institute of Biomaterial Science, Department of Active
Polymers, Germany. 2 Helmholtz Zentrum Geesthacht, Institute of Biomaterial Science,
Department of Active Poylmers, Germany. 3 Helmholtz Zentrum Geesthacht, Institute of
Biomaterial Science, Germany. 4 University of Potsdam, Institute of Chemistry, Germany.
Thermally-triggered polymer actuators are able to change their shape
repetitively when exposed to oscillating external heating. Recently,
semicrystalline polymer networks with reprogramming capability of the
actuator function and multiple actuation modes have been introduced. In these
multiphase polymer systems, the crystalline domains associated to a high
melting temperature (Tm) range acted as geometry determining domain (GD),
while the crystalline domain related to a lower Tm range served as actuating
domains (AD). Incorporation of functional fillers such as magnetite
nanoparticles (MNP) in these polymer systems enabled a remote actuation of
the composites. However, the synthesis of these multiphase polymers with
heterogeneous morphology is challenging especially with regard to MNP
aggregation and controlled phase segregation in the material. Here, we report
on the thermally-triggered actuators based on hybrid nanocomposites (H-NC) of
oligo(ω-pentadecalactone) (OPDL) and covalently integrated MNP (Ø = 10±1 nm)
acting as netpoints. This actuator material consists of only one type of
crystallizable chain segments providing both domain types, geometry
determining (GD) and actuating domains (AD). The covalent integration of the
OPDL coated MNP enabled a uniform dispersion of the nanoparticles and
increased the elastic moduli of the composites at 100 °C (T > Tm,OPDL). By
increasing the MNP content phase in H-NCs specially from 5 to 11 wt%, Tm,OPDL
raised from 73 °C to 80 °C, attributed to the increase in crystal size. The
reversible movement was observed by heating the sample to Tsep ranging from
65 °C to 74 °C, resulting in a partial melting of the OPDL crystalline domains
acting as AD and subsequent cooling of the sample to Tlow = 40 °C (Tlow