互穿聚合物网络
高分子化学
化学工程
玻璃化转变
热稳定性
异佛尔酮二异氰酸酯
甲基丙烯酸2-羟乙基酯
甲基丙烯酸酯
作者
Tsung-Tang T Hsieh,Kuo-Huang Hsieh,George P. Simon,Carlos Tiu,Hsiao-Ping P Hsu
标识
DOI:10.1007/s10965-006-0051-x
摘要
Interpenetrating polymer networks (IPNs) of 2-hydroxyethyl methacrylate-terminated polyurethane (HPU) and polyurethane (PU) with different crosslinking densities of the PU network were prepared by simultaneous solution polymerization. Dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC) show that compatibility of component polymers in IPN formation depends on the crosslinking density of the PU network. Physical properties such as density and water absorption rely on the subtle balance between the degree of phase separation and the crosslinking density of the PU network. In spite of the occurrence of phase separation, the tensile moduli and tensile strength of the IPNs increase with the crosslinking density of the PU network. Morphological observation by scanning electron microscopy revealed different fracture surfaces between the compatible and incompatible IPNs. Surface characteristics of the IPNs, indicated as hydrogen bonding index and hard-to-soft segment ratio, are altered considerably by varying surface morphologies. Improved blood compatibility of IPN membranes is due to the variation of the hydrophilic and hydrophobic domain distribution.
科研通智能强力驱动
Strongly Powered by AbleSci AI