The Cure Of O-Cresol Formaldehyde Epoxy Resin,the Study Of Its Nanocomposite

1. o-Cresol Formaldehyde epoxy resin (o-CFER) has been prepared in the part one of the paper. The kinetics of the cure reaction for a system of o-CFER with hardeners, such as 4,4-Diaminodiphenyl Ether and 3-methyl-1,2,3,6-tetrahydrophthalic anhydride (MeTHPA) with nano-montmorillonite, are studied by differential scanning calorimetry (DSC). Autocatalytic behavior is shown in the first stages of the cure for the system, which could be well described by the model proposed by Kamal that includes two rate constants, k 1 and k 2, and two reaction orders, m and n . The curing reaction at the later stages was practically diffusion-controlled due to the onset of gelation and vitrification. To consider the diffusion effect more precisely, diffusion factor f (α), is introduced into Kamal's equation. Thus, the curing kinetics could be predicted well over the whole range of conversion covering both pre-and postvitrification stages. The glass transition temperatures (Tg) of the o-CFER/DDE isothermally cured partially are determined by means of torsional braid analysis (TBA), and the results show that Tg increased with conversion. The thermal degradation kinetics of cured o-CFER are investigated by thermogravimetric analysis (TGA), revealing two decomposition steps. 2. Prepared two different nanocomposites: o-CFER/ MeTHPA /SiO2 and o-CFER/ MeTHPA /O-MMT. For the former, the properties was studied by means of mechanical property test, thermal property test, SEM, and DSC et al, and the technical parameters were determined. The results indicated the use of nano-meter SiO2 improved the tensile strength, impact strength and thermostability of the nanocomposites. For the later, the change of interlaminar spacing of the organic-montmorillonite in the cured product was analysed by XRD. Mechanics testing results show that impact strength and tensile strength were increased with lower content of oranic montmorillonite. 3. The interpenetrating polymer network (IPN) of o-Cresol Formaldehyde epoxy resin (o-CFER) and polyurethane (PU) was prepared by simultaneous way, and the effect of...