Abstract
In order to improve the thermal properties of important engineering plastics, a novel kind of liquid crystalline epoxy resin (LCER), 3,3′,5,5′-Tetramethylbiphenyl-4,4′-diyl bis(4-(oxiran-2-ylmethoxy)benzoate) (M1) was introduced to blend with nylon 66 (M2) at high temperature. The effects of M1 on chemical modification and crystallite morphology of M2 were investigated by rheometry, thermo gravimetric analysis (TGA), dynamic differential scanning calorimetry (DSC) and polarized optical microscopy (POM). TGA results showed that the initial decomposition temperature of M2 increased by about 8 °C by adding 7% wt M1, indicating the improvement of thermal stability. DSC results illustrated that the melting point of composites decreased by 12 °C compared to M2 as the content of M1 increased, showing the improvement of processing property. POM measurements confirmed that dimension of nylon-66 spherulites and crystallization region decreased because of the addition of liquid crystalline epoxy M1.
Highlights
Nylon 66 has been widely used in the fields of engineering plastics and fibers because of its excellent performance due to its high strength, wear-resistance and self-lubrication
Feng et al studied the crystallization behavior of co-polyamide 66 (FR-PA66) containing triarylphosphine oxide (TPO) which acts as a flame retardant [19]
The results discussed above lead to two main conclusions: First, small additions of M1 to M2 increase the initial decomposition temperature (Tdi) by 5~10 °C; second, the melting point of M1/M2 blends decreases with respect to M1
Summary
Nylon 66 has been widely used in the fields of engineering plastics and fibers because of its excellent performance due to its high strength, wear-resistance and self-lubrication. Modified nylon has gained considerable interest for its excellent mechanical strength, heat resistance, oil resistance, chemical resistance and other properties. With a small amount of nano-materials such as montmorillonite nanocomposites [11,12] added to the nylon substrate, the original performances, such as strength, modulus, heat deflection temperature and even air tightness can be greatly enhanced [13]. Few articles about nylon modified with liquid crystalline epoxy resin were published. Our work was focused on the thermal properties of nylon 66 modified with liquid crystalline epoxy resin (M1). With respect to its excellent performance in improving mechanic and thermal properties of ordinary commercial epoxy resin, a good performance on modifyingnylon (M2) will be a reasonable expectation
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