RIM Systems from Interpenetrating Polymer Networks
Simultaneous interpenetrating polymer networks (SIN-IPN’s) based on polyurethane and polyepo×ides were synthesized according to the processing conditions of RIM technology. Catalytic systems were selected in order to minimize or avoid formation of any covalent bonds between the epoxy and the polyurethane chains. In this way topological polymer alloys (IPN’S) were obtained which exhibited improved physical properties. Both low modulus and high modulus urethane elastomers were used in combination with epoxy resins derived from glycidyl ethers of bisphenol A. In addition, combinations of the latter with novolac epoxy resins were employed together with high modulus urethane elastomers. Maxima in ultimate tensile strength occurred at the ratio of 20/80 of epoxy resin/polyurethane systems. These maxima were interpreted as evidence of a permanent entanglement between the two different types of polymer networks. A thermoanalytical study using a Rheovibron and DSC was carried out to give further support for the formation of IPN’s. A comparison of the above SIN-IPN’s with reinforced high modulus polyurethane RIM systems (RRIM) was made. Glass reinforced IPN-RIM systems were also prepared with low modulus urethane elastomers.
KeywordsHard Segment Interpenetrate Polymer Network Unsaturated Polyester Flexural Modulus Modulus Ratio
Unable to display preview. Download preview PDF.
- 1.H.L. Frisch, D. Klempner and K.C. Frisch, J. Polym. Sci. A-2, 8, 921 (1970).Google Scholar
- 3.S.C. Kim, D. Klempner and K.C. Frisch, J. Appl. Polym. Sci., 21, 1289 (1977).Google Scholar
- 6.R.L. Touhsaent, D.A. Thomas and L.H. Sperling, J. Polym. Sc1., 46, 175 1974).Google Scholar
- 9.J.A. Munson and H. Sperling “Polymer Blends and Composities”, Plenum Publishing Co., New York (1976).Google Scholar
- 12.M.J. Mikulec, SPI-FSK International Conference, Strasbourg, France, June 9–13, 1980, Carl Hanser, Munich-Vienna, p. 137–148.Google Scholar
- K.C. Frisch and D. Klempner, Unpublished results.Google Scholar