Preparation of hydrophilic polymeric materials with movable cross-linkers and their mechanical property
Preparation of hydrophilic polymeric materials with movable cross-linkers and their mechanical property
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DOI：
10.1016/j.polymer.2020.122465
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发表时间：
2020-05
期刊：
影响因子：
4.6
通讯作者：
Ryohei Ikura;Y. Ikemoto;Motofumi Osaki;H. Yamaguchi;A. Harada;Y. Takashima
中科院分区：
文献类型：
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作者：
Ryohei Ikura;Y. Ikemoto;Motofumi Osaki;H. Yamaguchi;A. Harada;Y. Takashima
通过亲水性环糊精单体（γCDAAmMe）与液体丙烯酰胺单体的本体共聚获得了具有可移动交联剂的亲水性高分子材料。 2D1H-NOESY NMR 研究表明，主链穿透 CD 环单元，充当可移动的交联点。 γCDAAmMe 与 N,N-二甲基丙烯酰胺 (DMAA) 作为小主链单体共聚，产生亲水性可移动交联材料 (pDMAA-γCDAAmMe (x))。另一方面，使用4-丙烯酰吗啉（ACMO）或N,N-二甲基氨基丙基丙烯酰胺（DMAPAA）作为大体积主链单体，由于γCDAAmMe和侧链之间的空间位阻，不利于可移动交联的形成。在约 40–80 wt% 的含水量范围内，pDMAA-γCDAAmMe (1)s 的杨氏模量与 pDMAA-MBAAm (1) 相似。然而，可移动交联材料的断裂能高于用N,N'-亚甲基双（丙烯酰胺）（MBAAm）共价交联的材料。添加水增强了主链聚合物的流动性，从而允许可移动的交联点。
Hydrophilic polymeric materials with movable cross-linkers were obtained by the bulk copolymerization of a hydrophilic cyclodextrin monomer (γCDAAmMe) and liquid acrylamide monomers. A 2D1H-NOESY NMR study revealed that the main chains penetrated the CD ring units, which acted as movable cross-linking points. Copolymerization of γCDAAmMe withN,N-dimethyl acrylamide (DMAA) as a small main chain monomer results in hydrophilic movable cross-linked materials (pDMAA-γCDAAmMe (x)). On the other hand, using 4-acryloylmorpholine (ACMO) orN,N-dimethylaminopropyl acrylamide (DMAPAA) as a bulky main chain monomer disfavours the formation of movable cross-links due to steric hindrance between γCDAAmMe and the side chains. In the water content range of approximately 40–80 wt%, the Young's moduli of pDMAA-γCDAAmMe (1)s are similar to those of pDMAA-MBAAm (1). However, the fracture energy of movable cross-linked materials is higher than that of than materials covalently cross-linked withN,N′–methylenebis(acrylamide) (MBAAm). An addition of water enhanced the mobility of the main chain polymers, allowing the movable cross-linking points.