By Smithers Rapra Technology
ISmithers' brings the 1st excessive functionality Thermoplastics and Composites for Oil & gasoline functions convention to Houston to spotlight the continued examine, improvement and qualification of fabrics to let the to maneuver ahead into the hugely challenging environments being encountered at the present time and reply to new demanding situations that may exist sooner or later. adapted to the categorical wishes of the oil and fuel undefined, the convention will supply a discussion board for audio system to exhibit, and delegates to profit approximately new fabrics and processing applied sciences that may enhance present software functionality and open the door to enhance or exchange current fabric choices.
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Extra info for High Performance Thermoplastics and Composites for Oil and Gas Applications 2011
981 Sample PBI PEKK Finally, we investigated, whether the water uptake might lead to some decomposition of the PBI polymer, which could, in principle, be responsible for the polymers becoming more rigid. For this purpose, we dried a PBI-PEKK blend sample again, which had been exposed to water for a prolonged period of time. As it can be seen in the graphic of Figure 7 on the right side, the wet sample shows a shorter 13C T1 relaxation time as compared to the original sample, but the re-dried material yields a T1 curve that is practically identical to the one of the dry starting material.
Hereby, as a first step, the T1 relaxation time of the non-mobile domain was determined to be 73 s from measurements with relaxation delays of up to 90 s. Then, in order to fit the relaxation curves presented here the long relaxation time was held constant at 73 s. No entry assumptions regarding the T1 times of the rigid domains were made for the PEKK, PBI, and PBIPEKK blend samples. The wet PBI-PEKK blend was prepared by exposing the dry material to water for 24 hours. The re-drying procedure consisted of removing the water at 120°C under vacuum for 3 days.
In the rubbery plateau region, the modulus of PEEK-A materials is inversely correlated with the number-average molecular weight (Figure 2b), which indicates that behavior in this region is related to the degree of crystallinity (see Table 1). In PEEK-B materials, the trend is less clear. Figure 2. Solid state viscoelasticity of PAEKs; (a) Storage modulus during temperature ramp from 30°C to 300°C at rate of 3°C/min, (b) Data from (a) as function of molecular weight. Isothermal frequency sweeps from 1 rad/s to 100 rad/s were performed to differentiate relaxation behaviors between the various PAEKs.