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Synthesis and characterization of thermosensitive hydrogel with improved mechanical properties

Published online by Cambridge University Press:  13 August 2015

Hengjun Gai ,
Jie Wu ,
Chenyu Wu ,
Xuejiao Sun ,
Fengjun Jia  and
Yueqin Yu
Hengjun Gai
Affiliation:
State Key Laboratory Base of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, People's Republic of China
Jie Wu
Affiliation:
State Key Laboratory Base of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, People's Republic of China
Chenyu Wu
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People's Republic of China
Xuejiao Sun
Affiliation:
State Key Laboratory Base of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, People's Republic of China
Fengjun Jia
Affiliation:
State Key Laboratory Base of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, People's Republic of China
Yueqin Yu*
Affiliation:
State Key Laboratory Base of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, People's Republic of China
*
a)Address all correspondence to this author. e-mail: qustyu@163.com
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Abstract

Semi-interpenetrating polymer network (semi-IPN) and fully interpenetrating polymer network (full-IPN) hydrogels composed of sodium alginate (SA) and N-isopropylacrylamide (NIPAAm) were prepared with Ca2+ and N,N′-methylenebisacrylamide (BIS) as the cross-linkers, respectively. The influence of the SA content and crosslinking degree of alginate on thermosensitive, swelling, mechanical, morphological, and thermal properties was investigated in detail. The hydrogels obtained exhibited obvious thermosensitivity and rapid swelling rate. The presence of Ca2+ contributed to the improvement of mechanical properties obviously, without altering the thermosensitivity and network porosity of the hydrogels significantly. The compressive strength of full-IPN hydrogel was improved considerably, while the tensile strength was increased by 308.5% than semi-IPN hydrogel. The Tg of full-IPN dried hydrogel ran up to 142.9 °C with respect to 97.3 °C of pure PNIPAAm, and the improvement indicated that hydrogel with more compact structure was prepared.

Keywords

interpenetrating polymer network (IPN)thermoresponsive hydrogelN-isopropylacrylamidesodium alginatemechanical property

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Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 16 , 28 August 2015 , pp. 2400 - 2407
Copyright
Copyright © Materials Research Society 2015 

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