Sulfonic Acid-Functionalized Fe₃O₄Reinforced Soluble Polyimide: Synthesis and Properties

Abstract

In this study, a series of nanocomposite films based on an aromatic polyimide (PI) and sulfonic acid-functionalized magnetic nanoparticles (SA-MNP) was successfully prepared via an insitu technique. For this purpose, new soluble aromatic polyimide containing sulfone group as a polymeric matrix of the nanocomposites was synthesized.The surfaces of MNP were grafted with 3-mercaptopropyl trimethoxysilane. Then SA-MNP was obtained by oxidation of the thiol group. Effects of SA-MNP on thermal, tensile and magnetic properties of the prepared nanocomposite films were studied. The magnetic nanoparticles containing the sulfonic acid groups could have strong intermolecular bond interactions between the hydroxyl groups of SO 3 H and the sulfone and carbonyl groups of the PI matrix which caused the better dispersion of nanoparticle and exhibited superior mechanical properties, good magnetic properties and high thermal stability.

Target-Specific Superparamagnetic Hydrogel with Excellent pH Sensitivity and Reversibility: A Promising Platform for Biomedical Applications

“…TGA data for both PAAVSA and PAAVSA/Fe 3 O 4 comprise two distinct thermal degradation stages within the 230–450 °C range. The observed enhancement in thermal stability of PAAVSA/Fe 3 O 4 can be ascribed to the following two factors: (1) loading of Fe 3 O 4 nanoparticles (about 3 wt %, as discussed in earlier section) into the polymer matrix (PAAVSA), which can improve its thermal stability, since Fe 3 O 4 nanoparticles have good thermal stability, as demonstrated in Figure 6 , and (2) the interaction effect between nanoparticles and the polymer matrix, which limits the movement of the molecular chain of the polymer and protects the PAAVSA matrix from further degradation, 52 which in turn enhance the thermal stability of the system in addition (about 4–5%) in comparison to that of the mixture of noninteracting Fe 3 O 4 nanoparticles and PAAVSA, which can be observed and estimated from the comparison of percent residual weights of PAAVSA/Fe 3 O 4 , PAAVSA, and Fe 3 O 4 , 52 , 53 as displayed in Figure 6 .…”

Synthesis of novel colorless polyimides from benzimidazole diamines with various linearity

“…In contrast with the reported PBIIs, the solubility of two novel PBIIs has been boosted significantly as PBIIs can be dissolved in most polar organic solvent, as shown in Table 2. The asymmetric structure and the twist configuration bring about the substantial decrease on the degree of chain packing so that the solvents are enable to pass through the main chain smoothly 51,52 . Additionally, compared with 5b‐HPMDA, the weak linearity of 5a‐HPMDA eventuates in the loose chain packing and the augmented solubility.…”

A Biocompatible, pH-Sensitive, and Magnetically Separable Superparamagnetic Hydrogel Nanocomposite as an Efficient Platform for the Removal of Cationic Dyes in Wastewater Treatment

“…It should be noted that the respective residual weights of AA-VSA-P/SPIONs systems (in the range of 450–800 °C) are also higher in comparison to that of AA-VSA-P, which signifies the effect of incorporation of SPIONs into the system, while the thermal stability exhibits noticeable enhancement with increasing SPIONs concentration into the system. The observed improvement in the thermal stability of AA-VSA-P/SPIONs can be attributed to the effects of the following phenomena: (i) incorporation of SPIONs into the polymer matrix (AA-VSA-P), which can improve its thermal stability, as SPIONs have significantly high thermal stability, as illustrated in Figure , and (ii) the effect of SPIONs–polymer matrix interaction that restricts the movement of the polymer’s molecular chain and protects the AA-VSA-P matrix from further degradation …”

“…The observed improvement in the thermal stability of AA-VSA-P/ SPIONs can be attributed to the effects of the following phenomena: 28 (i) incorporation of SPIONs into the polymer matrix (AA-VSA-P), which can improve its thermal stability, as SPIONs have significantly high thermal stability, as illustrated in Figure 5, and (ii) the effect of SPIONs−polymer matrix interaction that restricts the movement of the polymer's molecular chain and protects the AA-VSA-P matrix from further degradation. 39 2.4. Dye Adsorption Properties.…”