Random copolymers of N-isopropyl acrylamide (NIPAAm) and acrylic acid (AAc) which exhibit temperature- and pH-responsive behavior were synthesized by free-radical polymerization. The copolymers were characterized by means of FT-IR spectrometry and titration. The influence of polyelectrolyte on the lower critical solution temperature (LCST) of pH/temperature-sensitive polymers was investigated in the pH range of 2-12. The LCSTs of PNIPAAm/water in poly(NIPAAm-co-AAc) were determined by cloud-point measurements. A polyelectrolyte complex was prepared by mixing poly(NIPAAm-co-AAc) with poly(allylamine) (PAA) or poly(L-lysine) (PLL) solutions as anionic and cationic polyelectrolytes, respectively. Back titration was performed to determine the content of AAc and to study the effect of comonomer ionization on the LCST. The LCSTs of PNIPAAm/water in the copolymers were strongly affected by pH, presence of polyelectrolyte, AAc content, and charge density on the polymer. The polyelectrolyte complexes were formed at neutral condition. The influence of more hydrophobic PLL as polyelectrolyte on the cloud-point of PNIPAAm/water in the copolymer was stronger than that of poly(allylamine) (PAA).
Citing 'Formation of Complex Between Polyelectrolytes and pH/Temperature Sensitive Copolymers
'
@article{ JCGMDC_1998_v42n1_84}
,title={Formation of Complex Between Polyelectrolytes and pH/Temperature Sensitive Copolymers}
,volume={1}
, number= {1}
, journal={Journal of the Korean Chemical Society}
, publisher={Korean Chemical Society}
, author={Mi Kyong, Yoo
and
Yong Kiel, Sung}
, year={1998}
, month={Feb}
TY - JOUR
T2 - Journal of the Korean Chemical Society
AU - Mi Kyong, Yoo
AU - Yong Kiel, Sung
SN - 1017-2548
TI - Formation of Complex Between Polyelectrolytes and pH/Temperature Sensitive Copolymers
VL - 42
PB - Korean Chemical Society
PY - 1998
ER -
Mi Kyong, Y.
,
&
Yong Kiel, S.
( 1998).
Formation of Complex Between Polyelectrolytes and pH/Temperature Sensitive Copolymers.
Journal of the Korean Chemical Society,
42
(1)
Korean Chemical Society.
Mi Kyong, Y
,
&
Yong Kiel, S
1998,
Formation of Complex Between Polyelectrolytes and pH/Temperature Sensitive Copolymers,
Journal of the Korean Chemical Society,
vol. 1,
no. 1,
[1]
Y Mi Kyong
,
and
S Yong Kiel
,
“Formation of Complex Between Polyelectrolytes and pH/Temperature Sensitive Copolymers”,
Journal of the Korean Chemical Society,
vol. 1,
no. 1,
Feb
1998.
Mi Kyong, Yoo
and
,
Yong Kiel, Sung
and
,
“Formation of Complex Between Polyelectrolytes and pH/Temperature Sensitive Copolymers”
Journal of the Korean Chemical Society,
1.
1
1998:
Mi Kyong, Y
,
Yong Kiel, S
Formation of Complex Between Polyelectrolytes and pH/Temperature Sensitive Copolymers.
Journal of the Korean Chemical Society
[Internet].
1998.
Feb ;
1
(1)
Mi Kyong, Yoo
,
and
Yong Kiel, Sung
,
“Formation of Complex Between Polyelectrolytes and pH/Temperature Sensitive Copolymers.”
Journal of the Korean Chemical Society
1
no.1
()
Feb,
1998):
