Surface modification of POSS–polyimide hybrid films by atomic oxygen using ECR plasma

Structure‐Property Relationship of Polyimide Fibers with High Tensile Strength and Low Dielectric Constant by Introducing Benzimidazole and Trifluoromethyl Units

“…As revealed by the FTIR spectra shown in Figure , the existence of imide circles for all the samples could be confirmed by the presence of four characteristic absorption bands at 1780 cm −1 for the CO asymmetrical stretching vibration, 1720 cm −1 for the CO asymmetrical stretching vibration, 1348 cm −1 for the CN stretching vibration, and 720 cm −1 for the CO bending vibration. [ 31,32 ] Meanwhile, the absence of the amide bonds (1650 cm −1 for the amide‐I band and 1550 cm −1 for the amide‐II band) in the FTIR curves indicated that a high imidization degree was achieved for all the samples. [ 12 ] Besides, the absorption bands at 1306 and 3350 cm −1 were considered to be corresponding to CF 3 groups and NH groups, suggesting the successful incorporation of both the TFMB and BIA moieties.…”

“…The larger d-spacing, as a reflection for the average packing distance for the chain segments of the PI macromolecule, indicates a looser molecular packing structure in the resultant fibers, which means a higher flexibility of the chain segments. [31] As a result, the polyimide fiber with more TFMB contents has shown lower T g . Moreover, the order degree X of the fibers, as listed in Table 4, dropped first and then rose up with more TFMB contents incorporated to the fiber, demonstrating the changes of molecular chain regularity due to the introduction of trifluoromethyl.…”

A novel structural polyimide material with synergistic phosphorus and POSS for atomic oxygen resistance

“…5d) according to the binding energy, regardless of the structural situations of the imperfect cages. 18,19,44 These observations also indicated that the increasing oxygen concentration was due to the reaction of a portion of silicon with oxygen to form new silicon oxides with higher oxygen content. Similarly, the irradiated-surface carbon concentration of POSS-PI-16P decreased compared with the pristine nanocomposite because the carbon reacted with oxygen to form volatile gas, which released to the environment because of AO exposure.…”

Synthesis of PI/POSS nanocomposite films based on track nuclear membranes and assessment of their resistance to oxygen plasma flow

“…In this case, an uneven distribution of particles throughout the volume of PI occurred which significantly reduced the protection against atomic oxygen [28]. To solve this problem, copolymerizing POSS monomers with the PI precursor was used to obtain a hybrid nanocomposite [29,30]. Despite this, it is not possible to completely protect against weight loss when exposed to atomic oxygen.…”