Preparation of hydrophilic polymeric materials with movable cross-linkers and their mechanical property

POLYMER

卷:196

Article

Ikura, Ryohei¹  Ikemoto, Yuka²  Osaki, Motofumi^1,3  Yamaguchi, Hiroyasu^1,3  Harada, Akira⁵  Takashima, Yoshinori^1,3,4 

[1] Osaka Univ, Grad Sch Sci, Dept Macromol Sci, Toyonaka, Osaka 5600043, Japan

[2] Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6795198, Japan

[3] Osaka Univ, Project Res Ctr Fundamental Sci, Grad Sch Sci, Toyonaka, Osaka 5600043, Japan

[4] Osaka Univ, Inst Adv Cocreat Studies, Suita, Osaka 5650871, Japan

[5] Osaka Univ, Inst Sci & Ind Res, Ibaraki, Osaka 5670047, Japan

关键词: Movable cross-linker;    Hydrophilic polymeric material;    Fracture energy;   

DOI  :  10.1016/j.polymer.2020.122465

来源: Elsevier

【 摘 要 】

Hydrophilic polymeric materials with movable cross-linkers were obtained by the bulk copolymerization of a hydrophilic cyclodextrin monomer (gamma CDAAmMe) and liquid acrylamide monomers. A 2D H-1-NOESY NMR study revealed that the main chains penetrated the CD ring units, which acted as movable cross-linking points. Copolymerization of gamma CDAAmMe with N,N-dimethyl acrylamide (DMAA) as a small main chain monomer results in hydrophilic movable cross-linked materials (pDMAA-gamma CDAAmMe (x)). On the other hand, using 4-acryloylmorpholine (ACMO) or N,N-dimethylaminopropyl acrylamide (DMAPAA) as a bulky main chain monomer disfavours the formation of movable cross-links due to steric hindrance between gamma CDAAmMe and the side chains. In the water content range of approximately 40-80 wt%, the Young's moduli of pDMAA-gamma CDAAmMe (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 with N,N'-methylenebis(acrylamide) (MBAAm). An addition of water enhanced the mobility of the main chain polymers, allowing the movable cross-linking points.

【 授权许可】

Free