Citation: Hong-wei Qin, Hua-ji Liu, Yu Chen. Influence of Aliphatic Amide Terminals on the Thermoresponsive Properties of Hyperbranched Polyethylenimines[J]. Chinese Journal of Polymer Science, ;2014, 32(10): 1338-1347. doi: 10.1007/s10118-014-1509-7 shu

Influence of Aliphatic Amide Terminals on the Thermoresponsive Properties of Hyperbranched Polyethylenimines

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Department of Chemistry, School of Sciences, Tianjin University, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China

Corresponding author: Yu Chen, chentangyu@yahoo.com
Received Date: 11 December 2013
Revised Date: 13 January 2014

Fund Project: This work was financially supported by the Program for New Century Excellent Talents in Universities, and the National Natural Science Foundation of China (Nos. 20804027 and 21274106).

Acetamide (C2), propionamide (C3), butyramide (C4), isobutyramide (i-C4), isovaleramide (i-C5) and trimethylacetamide (t-C5) groups each were introduced to the terminals of hyperbranched polyethylenimine (HPEI) through the amidation reaction between HPEI and the corresponding anhydride. Moreover, HPEIs terminated with two kinds of amides were also prepared. The first amide was fixed to be i-C4 with 52% degree of amidation (DA), and the second amide varied from C2, C3, C4, i-C5 to t-C5. All the polymers were characterized by 1H-NMR. Turbidimetry measurements were performed for these polymers in water at different temperatures. With respect to the polymers bearing only one kind of amide group, except C2, all the other amide groups could render thermoresponsive properties to HPEI. The specific ordering of these amide groups to reduce the cloud point temperature (Tcp) was as follows: i-C5 t-C5 C4 i-C4 C3. Moreover, the more branched i-C4 and t-C5 were better groups than their less branched isomers C4 and i-C5 in the Tcp range of 12-51℃ to render the sharper phase transition to the thermoresponsive polymers. As for the polymers bearing two kinds of amide groups, the further introduction of C2, C3, C4, i-C5 or t-C5 could effectively endow HPEI bearing 52% of i-C4 with thermoresponsive properties. The specific ordering of these second amide groups to reduce the Tcp was as follows:i-C5 C4 i-C4 C3 C2. C4, i-C5 and t-C5 were all effective second amide groups to prepare the thermoresponsive polymers with sharper phase transition.
- Aliphatic amide,
- Hyperbranched,
- Phase transition,
- Polyethylenimine,
- Thermoresponsive polymers
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沈阳化工大学材料科学与工程学院沈阳 110142