Effect of crosslinking density on the physical properties of interpenetrating polymer networks of polyurethane and 2-hydroxyethyl methacrylate-teminated polyurethane |
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| Authors: | Tsung-Tang Hsieh Kuo-Huang Hsieh George P Simon Carlos Tiu Hsiao-Ping Hsu |
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| Affiliation: | (1) Department of Chemical Engineering, Monash University, Clayton, Vic., 3168, Australia;(2) Department of Materials Engineering, Monash University, Clayton, Vic., 3168, Australia;(3) Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan, ROC;(4) Laboratory of Particle Technology, National Taiwan University, Taipei, 10617, Taiwan, ROC |
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| Abstract: | 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. |
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| Keywords: | IPNs Polyurethane Crosslinking density Phase separation Blood compatibility |
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