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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.

[email protected]

Rapid 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