Graft interpenetrating polymer networks of polyurethane and epoxy containing rigid rods in side chain |
| |
| Authors: | J L Han S P Lin S B Ji K H Hsieh |
| |
| Affiliation: | 1. Department of Chemical and Materials Engineering, National I‐Lan University, I‐Lan, Taiwan 260, Republic of China;2. Department of Chemical Engineering, Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan 106, Republic of China |
| |
| Abstract: | The rigid rod‐like 4,4′‐bis(6‐hydroxyhexyloxy)biphenyl (BHHBP) units were distributed in either the epoxy or polyurethane to become SR‐epoxy and PU (with or without BHHBP) polymer matrices. The interpenetrating polymer networks (IPNs) of PU (with or without BHHBP) and SR‐epoxy were synthesized through simultaneous polymerization, and connected each other via the grafting reaction between the ? NCO groups of the PU polymer network and the ? OH groups on the side chains of SR‐epoxy network. The thermal and mechanical characteristics, compatibilities, and morphologies of these PU (with or without BHHBP)/SR‐epoxy graft‐IPNs were investigated. The polyether‐type PU(PPG series)/SR‐ epoxy graft‐IPNs exhibited two‐phased morphologies (i.e., phase separation occurred), and higher fracture energies (GIC). Whereas the polyester‐type PU(PBA series)/SR‐ epoxy graft‐IPNs were homogeneous (no phase separation), and exhibited higher tensile and Izod impact strengths. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 |
| |
| Keywords: | grafted‐interpenetrating polymer networks (graft‐IPNs) epoxy polyurethane (PU) mechanical property liquid crystal polymer (LCPs) compatibililty |
|
|
