Revisiting the Thermosensitivity of Poly(acrylamide-co-diacetone acrylamide)
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Revisiting the Thermosensitivity of Poly(acrylamide-co-diacetone acrylamide)
Revisiting the Thermosensitivity of Poly(acrylamide-co-diacetone acrylamide)
Chinese Journal of Polymer Science2014年32卷第5期 页码:531-539
Affiliations:
a.Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
b.Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
Xin-ming Xing, Guang-ming Liu, Yan-wei Ding, 等. Revisiting the Thermosensitivity of Poly(acrylamide-co-diacetone acrylamide)[J]. Chinese Journal of Polymer Science, 2014,32(5):531-539.
Xin-ming Xing, Guang-ming Liu, Yan-wei Ding, et al. Revisiting the Thermosensitivity of Poly(acrylamide-co-diacetone acrylamide)[J]. Chinese Journal of Polymer Science, 2014, 32(5): 531-539. DOI: 10.1007/s10118-014-1440-y.
Xin-ming Xing, Guang-ming Liu, Yan-wei Ding, 等. Revisiting the Thermosensitivity of Poly(acrylamide-co-diacetone acrylamide)[J]. Chinese Journal of Polymer Science, 2014,32(5):531-539.DOI: 10.1007/s10118-014-1440-y.
Xin-ming Xing, Guang-ming Liu, Yan-wei Ding, et al. Revisiting the Thermosensitivity of Poly(acrylamide-co-diacetone acrylamide)[J]. Chinese Journal of Polymer Science, 2014, 32(5): 531-539. DOI: 10.1007/s10118-014-1440-y.DOI:
Revisiting the Thermosensitivity of Poly(acrylamide-co-diacetone acrylamide)
The lower critical solution temperature (LCST) behavior of poly(acrylamide-
co
-diacetone acrylamide) (poly(AM
co
-DAM)) copolymer in aqueous solutions was studied. The results demonstrate the LCST linearly decreases as the molar fraction of DAM (
f
DAM
) increases. In the range of
f
DAM
<
0.36
the transmittance increases as
f
DAM
decreases because the more hydrophilic copolymer chains can form looser aggregates with a lower refractive index. The transmittance exhibits a minimum when
f
DAM
is less than 0.28 as the chains form micelle-like structure with a size smaller than the wavelength. The LCST decreases with the initial polymer concentration
but it levels off when the polymer concentration is high enough. Moreover
no hysteresis can be observed in the change of transmittance during the heating-cooling process because no additional hydrogen bonds are formed in the collapsed state due to the steric hindrance of the large side groups in DAM units.
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