Abstract
A series of macrocyclic and linear poly(2-isopropyl oxazoline)s containing a photoresponsive azobenzene moiety (Az-PiPOxs) were synthesized by Cu(i)-catalyzed cycloaddition reaction between azide-functionalized azobenzene and alkyne-bearing poly(2-isopropyl oxazoline)s. Upon temperature elevation, both macrocyclic and linear Az-PiPOx exhibited a sharp hydrophilic-to-hydrophobic phase transition: the initially clear solution became turbid at specific temperatures. The photoisomerization of the azobenzene moiety resulted in the large change of the thermal transition temperature of the polymers. cis isomers exhibited a higher thermal transition temperature than trans isomers. Thus, the phase transition can be controlled by 365 and 254 nm UV irradiation.
| Original language | English |
|---|---|
| Pages (from-to) | 10074-10080 |
| Number of pages | 7 |
| Journal | RSC Advances |
| Volume | 7 |
| Issue number | 17 |
| DOIs | |
| Publication status | Published - 2017 Jan 1 |
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All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Chemical Engineering(all)
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Hydrophilic-hydrophobic phase transition of photoresponsive linear and macrocyclic poly(2-isopropyl-2-oxazoline)s. / Jung, Yongseok; Nam, Jaehyuk; Kim, Joo Ho; Jang, Woo Dong.
In: RSC Advances, Vol. 7, No. 17, 01.01.2017, p. 10074-10080.Research output: Contribution to journal › Article
TY - JOUR
T1 - Hydrophilic-hydrophobic phase transition of photoresponsive linear and macrocyclic poly(2-isopropyl-2-oxazoline)s
AU - Jung, Yongseok
AU - Nam, Jaehyuk
AU - Kim, Joo Ho
AU - Jang, Woo Dong
PY - 2017/1/1
Y1 - 2017/1/1
N2 - A series of macrocyclic and linear poly(2-isopropyl oxazoline)s containing a photoresponsive azobenzene moiety (Az-PiPOxs) were synthesized by Cu(i)-catalyzed cycloaddition reaction between azide-functionalized azobenzene and alkyne-bearing poly(2-isopropyl oxazoline)s. Upon temperature elevation, both macrocyclic and linear Az-PiPOx exhibited a sharp hydrophilic-to-hydrophobic phase transition: the initially clear solution became turbid at specific temperatures. The photoisomerization of the azobenzene moiety resulted in the large change of the thermal transition temperature of the polymers. cis isomers exhibited a higher thermal transition temperature than trans isomers. Thus, the phase transition can be controlled by 365 and 254 nm UV irradiation.
AB - A series of macrocyclic and linear poly(2-isopropyl oxazoline)s containing a photoresponsive azobenzene moiety (Az-PiPOxs) were synthesized by Cu(i)-catalyzed cycloaddition reaction between azide-functionalized azobenzene and alkyne-bearing poly(2-isopropyl oxazoline)s. Upon temperature elevation, both macrocyclic and linear Az-PiPOx exhibited a sharp hydrophilic-to-hydrophobic phase transition: the initially clear solution became turbid at specific temperatures. The photoisomerization of the azobenzene moiety resulted in the large change of the thermal transition temperature of the polymers. cis isomers exhibited a higher thermal transition temperature than trans isomers. Thus, the phase transition can be controlled by 365 and 254 nm UV irradiation.
UR - http://www.scopus.com/inward/record.url?scp=85011959331&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85011959331&partnerID=8YFLogxK
U2 - 10.1039/c7ra01042g
DO - 10.1039/c7ra01042g
M3 - Article
AN - SCOPUS:85011959331
VL - 7
SP - 10074
EP - 10080
JO - RSC Advances
JF - RSC Advances
SN - 2046-2069
IS - 17
ER -