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Polymer Chemistry 2018
Polymer Sciences
ISSN: 2471-9935
Page 47
March 26-28, 2018
Vienna, Austria
3
rd
Edition of International Conference and Exhibition on
Polymer Chemistry
P
oly(ether-
b
-amide) multiblock copolymers (PEBA) are
a class of important thermoplastic elastomers (TPE)
s, due to the tuneable properties with variable polyether
soft segments (SS)s that realizes the reliable mechanical
strength. We have studied packing behaviour of a series of
N-alkylated polyamides1)-2) and polyimines3), and recently
developed a rapid synthetic strategy of a novel type PEBA
consisting of monodisperse poly(4-
N
-methyl benzamide)
(PMBA) with poly(propylene oxide) (PPO). The resulting
block copolymer shows phase-segregated structure with
two distinct glass transition temperatures (T
g
)s of -65 and
above 50°C. Considering the experimental results of no phase
segregation of the copolymer based on polydisperse PMBA
(M
w
/M
n
> 1.4) with PPO, the monodisperse PMBA segment
should play a critical role in the phase separation behaviour.
The soft segment was then replaced from amorphous PPO into
crystalline poly(ethylene glycol) (PEG), resulting in considerably
distinctive phase segregation behaviour, probably due to the
foreclosing effect of PEG crystal phase to PMBA segment. The
dual crystalline phases realize a novel shape memory polymer
(SMP) as depicted in Figure 1. In our system, the temporally
shape is formed at above 60
o
C (melting temperature (T
m
) of
PEG), and fixed below the temperature. Once the material is
heated above the temperature, the original shape is promptly
recovered. It is noticeable that the T
m
of PMBA was increased
from 208 to 232
o
C in DSC 1
st
and 2
nd
measurements while the
T
m
of PEG was almost same at 52°C. The annealing of the
block copolymer was performed from 200 to 240°C, affording
the promotion of the higher crystalline state of PEG segment.
The polarized optical microscope observation indicated the
growth of the PEG crystal in this annealing treatment. The
finally obtained SMP film of the block copolymer shows the
tensile modulus, strength, and elongation at breaks of 233
MPa, 10 MPa, and 100%, respectively. The properties of SMP
were controllable with the change of two segments within the
block copolymer.
Recent Publications
1. Shibasaki, Y.; Abe, Y.; Sato, N; Fujimori, A.; Oishi, Y. (2010), “Direct
condensation polymerization of N-alkylated p-aminobenzoic
acid and packing of rigid-rod main chains with flexible side
chains.”,
Polym. J
. 42, 72-80. 2) Fujimori, A.; Miura, S.; Kikkawa,
Shibasaki, Y. (2014), “Fabrication and structure of “polymer
nanosphere multilayered organization”
J. Polym. Sci. PART B:
Polym. Phys.
418, 338-349. 3) Miura, S., Shidara, Y., Yunoki,
T., Shibasaki, Y., Fujimori, A. (2017), “High-Density Packing of
Amorphous Polymer with Bulky Aromatic Rings in Interfacial
Molecular Films”,
Macromol. Chem. and Phys.
218(7),
1600520. 4) Kotaki, T. Nishimura, N., Ozawa, M., Fujimori,
A., Muraoka, H., Ogawa, S., Korenaga, T., Suzuki, E., Oishi, Y.,
Shibasaki, Y. (2016), “Synthesis of highly refractive and highly
fluorescent rigid cyanuryl polyimines with polycyclic aromatic
hydrocarbon pendants”, Polymer Chemistry 7, 1297-1308.
5) Mori, T., Masukawa, S., Kikkawa, T., Fujimori, A., Satoh, A.,
Matsumoto, K., Jikei, M., Oishi, Y., Shibasaki, Y. (2017), “Rapid
synthesis and properties of segmented block copolymers
based on monodisperse aromatic poly(N-methyl benzamide)
and poly(propylene oxide)” RSC Advances 7, 33812-33821
.
Biography
Yuji Shibasaki is an Associate Professor in Polymer Chemistry at Iwate Uni-
versity, Japan. He studied Material Chemistry in Tokyo Institute of Technology
(TIT) under the guidance of Professor Y Imai, and Polymer Chemistry at TIT un-
der Professor T Endo. He received his PhD in 2000 for research of controlled
ring-opening polymerization of lactones and cyclic carbonates. He worked as
an Assistant Professor until 2007 in TIT. He engaged in Nanoparticle Chemistry
in a Taton Research Group in the University of Minnesota (USA) from 2005 to
2006. His current research interests are in the synthesis of well-defined poly-
mers, synthesis of bioinspired materials, and development of functional poly-
meric materials.
yshibasa@iwate-u.ac.jpRapid synthesis of a novel type thermostable poly(ether)-b-
poly(amide) (PEBA) with well-defined aramide segments, and the
application to shape memory material
Yuji Shibasaki
Iwate University, Japan
Yuji Shibasaki, Polym Sci, Volume 4
DOI: 10.4172/2471-9935-C1-008