Citation: Xin-ming Xing, Guang-ming Liu, Yan-wei Ding, Guang-zhao Zhang. 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 shu

Revisiting the Thermosensitivity of Poly(acrylamide-co-diacetone acrylamide)

Corresponding author: Guang-zhao Zhang,
Received Date: 8 November 2013
Revised Date: 12 December 2013

Fund Project: This work was financially supported by the Ministry of Science and Technology of China (No. 2012CB933802) and the National Natural Science Foundation of China (Nos. 21004057 and 21004058).

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 (fDAM) increases. In the range of fDAM 0.36, the transmittance increases as fDAM decreases because the more hydrophilic copolymer chains can form looser aggregates with a lower refractive index. The transmittance exhibits a minimum when fDAM 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.
- Thermosensitive,
- Aggregation,
- Hydrogen bonds,
- Steric hindrance,
- Hysteresis
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