Foshan University, Foshan 528000, PR China; Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, PR China; Key Laboratory of Cellulose and Lignocellulosics Chemistry, Chinese Academy of Sciences, 510650, PR China; Guangdong Provincial Key Laboratory of Organic Polymer Materials for Electronics, 510650, PR China.
Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, PR China; Key Laboratory of Cellulose and Lignocellulosics Chemistry, Chinese Academy of Sciences, 510650, PR China; Guangdong Provincial Key Laboratory of Organic Polymer Materials for Electronics, 510650, PR China.
Carbohydr Polym. 2016 Feb 10;137:433-440. doi: 10.1016/j.carbpol.2015.11.001. Epub 2015 Nov 10.
A ternary system thermoresponsive hydrogel, poly(N-isopropylacrylamide-co-hydroxyethyl methylacrylate polycaprolactone)/hydroxypropyl cellulose (or P(NIPAAm-co-HEMAPCL)/HPC), was prepared via "alkynyl/azide" click chemistry between the azide modified graft copolymer P(NIPAAm-co-HEMAPCL-N3) and the alkynyl modified HPC (or alkynyl-HPC). The structures of P(NIPAAm-co-HEMAPCL-N3) and alkynyl-HPC were characterized by (1)H NMR, SEC and FT-IR, and the results demonstrated that the mole ratio of the alkynyl and azide functional groups, and the feed ratios of HPC, PCL, and PNIPAAm could be easily adjusted. The incorporation of PCL and HPC dramatically enhanced the compression modulus of the P(NIPAAm-co-HEMAPCL)/HPC hydrogel, which ranged from 500 to 1000 g/cm(2). Due to the immiscibility of HPC and PCL, a heterogeneous and semicontinuous structure was observed via SEM. The incorporation of HPC accelerated the water absorption rate and enhanced the hydrogel's ability to shed water. The swelling-deswelling and compressive properties could also be adjusted by changing the feeding ratio. The hydrogel exhibited reversible swelling-deswelling behavior after three "swelling-deswelling" cycles.
一种三元体系温敏水凝胶，聚（N-异丙基丙烯酰胺-co-羟乙基甲基丙烯酸酯聚己内酯）/羟丙基纤维素（或 P（NIPAAm-co-HEMAPCL）/HPC），是通过在叠氮改性接枝共聚物 P（NIPAAm-co-HEMAPCL-N3）和炔基改性 HPC（或炔基-HPC）之间的“炔基/叠氮化物”点击化学反应制备的。P（NIPAAm-co-HEMAPCL-N3）和炔基-HPC 的结构通过 1H NMR、SEC 和 FT-IR 进行了表征，结果表明，炔基和叠氮官能团的摩尔比以及 HPC、PCL 和 PNIPAAm 的进料比可以很容易地进行调整。PCL 和 HPC 的掺入极大地提高了 P（NIPAAm-co-HEMAPCL）/HPC 水凝胶的压缩模量，范围从 500 到 1000 g/cm2。由于 HPC 和 PCL 的不混溶性，通过 SEM 观察到非均相和半连续结构。HPC 的掺入加速了水的吸收速度，并增强了水凝胶的排水能力。通过改变进料比还可以调整溶胀-去溶胀和压缩性能。水凝胶在三个“溶胀-去溶胀”循环后表现出可逆的溶胀-去溶胀行为。
