CAJ | 학술논문

将定向冰晶模板致孔技术引入到冰冻聚合过程当中，制备出具有取向性孔结构的聚乙二醇(PEG)多孔凝胶。在凝胶内表面的孔壁上吸附沉积一层致密的碳纳米管(CNTs)，得到一种特殊的PEG/CNTs复合多孔凝胶。通过对PEG凝胶的共聚改性，可以使得吸附的CNTs层更加均匀、致密，沉积的CNTs 的含量达到1.0%(wt)，而未经改性的PEG凝胶只能吸附约0.08%(wt)的CNTs。该复合凝胶在干燥状态下的导电率为1.5×10-1 S?m-1，比相同CNTs含量下，用常规原位聚合方法制备的CNTs复合凝胶的导电率(2.7×10-4 S?m-1)高出3个数量级；比用相同聚合方法制备的未经过改性的复合凝胶(2.9×10-4 S.m-1)也要高出3个数量级。该复合凝胶在充分溶胀状态下的导电率为5.2×10-2 S?m-1，比相同CNTs含量下，用常规原位聚合方法制备的CNTs复合凝胶的导电率高出2个数量级。
장정향빙정모판치공기술인입도빙동취합과정당중，제비출구유취향성공결구적취을이순(PEG)다공응효。재응효내표면적공벽상흡부침적일층치밀적탄납미관(CNTs)，득도일충특수적PEG/CNTs복합다공응효。통과대PEG응효적공취개성，가이사득흡부적CNTs층경가균균、치밀，침적적CNTs 적함량체도1.0%(wt)，이미경개성적PEG응효지능흡부약0.08%(wt)적CNTs。해복합응효재간조상태하적도전솔위1.5×10-1 S?m-1，비상동CNTs함량하，용상규원위취합방법제비적CNTs복합응효적도전솔(2.7×10-4 S?m-1)고출3개수량급；비용상동취합방법제비적미경과개성적복합응효(2.9×10-4 S.m-1)야요고출3개수량급。해복합응효재충분용창상태하적도전솔위5.2×10-2 S?m-1，비상동CNTs함량하，용상규원위취합방법제비적CNTs복합응효적도전솔고출2개수량급。
A unidirectional freezing technique was combined with cryopolymerization to prepare poly (ethylene glycol) (PEG) hydrogels with aligned porous structure. Freeze-dried samples were immersed in aqueous carbon nanotube (CNTs) dispersions. CNTs diffused into the pores of the hydrogel, and deposited onto the inner walls of the pores. Introducing a cationic moiety, (3-Acrylamidopropyl)trimethylammonium Chloride (AAPTAC) into the hydrogel by copolymerizing with PEGDA can enhance the deposition of CNTs, as electrostatic force together with van der Waals force improves the interreaction between CNTs and PEG. Therefore, the porous PEG hydrogels prepared are coated with a dense and compact CNTs layer. The obtained composite hydrogels possess good electrical conductivity, which is up to 1.5×10-1 S?m-1 in dry state. While the conductivity of the samples prepared by in situ polymerization is 3 magnitudes lower (2.7×10-4 S?m-1). The conductivity of the sample prepared using the same surface-deposition method but without a cationic moiety is as low as 2.9×10-4 S?m-1 because of less absorption of CNTs.