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中国科学院软物质化学重点实验室 中国科学技术大学化学与材料科学学院 合肥 230026
Published:2016-11,
Received:15 March 2016,
Revised:26 April 2016,
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Xiao-xia Lu, Peng-yun Li, Jia-min Li, Wei-dong He. Preparation and Investigation of Conductive Hydrogels of Polyacrylamide-
Xiao-xia Lu, Peng-yun Li, Jia-min Li, Wei-dong He. Preparation and Investigation of Conductive Hydrogels of Polyacrylamide-
通过两步聚合得到既具有良好力学强度又具有优良导电性能的聚丙烯酰胺-
g
-聚苯胺复合水凝胶.首先,丙烯酰胺和
N
-(4-氨苯基)丙烯酰胺在钴源
γ
-射线辐照下共聚形成聚丙烯酰胺水凝胶;然后,苯胺在具有微观多孔结构的聚丙烯酰胺凝胶中吸附,在过硫酸铵的作用下与凝胶的苯胺侧基发生接枝聚合,得到聚丙烯酰胺-g-聚苯胺水凝胶,并形成聚苯胺连续导电通道.改变辐照时间和辐照剂量率,所获得的聚丙烯酰胺水凝胶的凝胶分数随着辐照剂量的增加逐渐增大,而溶胀率随着辐照剂量的增加呈先增后减的趋势,表明凝胶的交联程度随辐照剂量呈规律性变化;辐照交联聚合的单体浓度对凝胶的性能,如溶胀率、微观结构和机械性能等也有影响.酸掺杂后,聚丙烯酰胺-
g
-聚苯胺复合凝胶的电导率达到9 S/m.
Composite hydrogels of polyacrylamide-graft-polyaniline possessing both good mechanical strength and excellent electrical conductivity were prepared through a two-step polymerization route.Firstly
acrylamide (Am) and
N
-(4-aminophenyl)acrylamide (APAm) were radically copolymerized through Co
60
γ
-irradiated initiation in aqueous solution to form P(Am-
co
-APAm) hydrogels
of which the aminophenyl side groups facilitated the following graft polymerization of aniline.Secondly
after the lyophilized P(Am-
co
-APAm) hydrogels were re-swelled in aniline aqueous solution
aniline absorbed in the macroporous hydrogels underwent the oxidation coupling graft polymerization with aminophenyl side groups of P(Am-
co
-APAm) to result in P(Am-
co
-APAm)-
g
-PANI composite hydrogels.As expected
the produced polyaniline was naturally deposited onto the pore wall of P(Am-
co
-APAm) hydrogels
leading to the formation of inter-connected conductive pathway.Fourier transfer infrared spectroscopy
combined with the repeated removal of possible homopolyaniline with
N
-methylpyrilidone
confirmed the successful grafting.To modulating the mechanical properties
the influences of radical polymerization parameters were investigated.By changing radiation duration and dose rate
it was found that the gel fraction (GF) of P(Am-
co
-APAm) hydrogels increased with the increment of irradiation dose
while swelling degree (SD) had the maximum value under medium irradiation dose
reflecting that both monomer conversion and crosslinking degree affected the GF and SD of P(Am-
co
-APAm) hydrogels.With the increase in monomer concentration
GF was kept going up and levelled off at 1.5
c
0
while SD kept going down and levelled off at the same monomer concentration.The tensile strength and elongation at break of P(Am-
co
-APAm) hydrogels decreased
but elastic modulus increased
reflecting the cooperative impact of crosslinking degree and polymer produced.Interestingly
as observed by scanning electron microscopy
the hydrogels prepared in neutral water had the open and macro-porous morphology while those obtained in HCl solution had no distinct pores.For both hydrogels
TEM images showed no separated polyaniline particles located in the hydrogel pores and the thickness of pore wall obviously increased
indicating the formation of continuous polyaniline layer on the previous pore wall.Therefore
after being doped with HCl
P(Am-
co
-APAm)-
g
-PANI composite hydrogels exhibited excellent conductivity as high as 7~10 S/cm
which exceeded most of the reported values for polyaniline-containing hydrogels.
水凝胶导电性聚丙烯酰胺聚苯胺接枝聚合辐照
HydrogelConductivityPolyacrylamidePolyanilineGraft ploymerizationγ-Irradiation
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