Tough and highly stretchable graphene oxide/polyacrylamide nanocomposite hydrogels
Tough and highly stretchable graphene oxide/polyacrylamide nanocomposite hydrogels
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坚韧且高度可拉伸的氧化石墨烯/聚丙烯酰胺纳米复合水凝胶
DOI：
10.1039/c2jm32541a
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Yu, Zhong-Zhen
中科院分区：
文献类型：
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作者：
Liu, Ruiqiong;Liang, Songmiao;Yu, Zhong-Zhen
以氧化石墨烯（GO）纳米片为交联剂，通过丙烯酰胺（PAM）在GO水悬浮液中的原位自由基聚合，合成了聚丙烯酰胺（PAM）/氧化石墨烯（GO）纳米复合水凝胶（PGH）。在交联剂的类型和含量方面的水凝胶的拉伸性能进行了研究。与传统的N，N '-亚甲基双丙烯酰胺交联PAM水凝胶（PBH）相比，PGH具有高的拉伸强度、高的韧性，特别是大的断裂伸长率。PGH的拉伸强度约为PBH的4.5倍，断裂伸长率超过3000%，即使GO含量仅为0.0079wt%，也比PBH高近一个数量级。通过对PGH交联结构的分析和单位体积凝胶中交联聚合物链数的理论计算，提出了PGH的结构模型。
Polyacrylamide (PAM)/graphene oxide (GO) nanocomposite hydrogels (PGH) with GO nanosheets as cross-linkers were synthesized via in situ free radical polymerization of acrylamide in an aqueous suspension of GO. The tensile properties of the hydrogels were investigated in terms of type and content of cross-linkers. Compared to conventional PAM hydrogels (PBH) cross-linked chemically with N,N'-methylenebisacrylamide, PGH exhibits high tensile strength, high toughness and especially a large elongation at break. The tensile strength of PGH is about 4.5 times higher than that of PBH, and the elongation at break is over 3000%, nearly one order higher than that of PBH even when the content of GO is only 0.0079 wt%. By analyzing the cross-linked structure of PGH and the theoretical calculation on the number of cross-linked polymer chains per unit volume of gels, a structure model was thus proposed.