Abstract
Organic montmorillonite (MMT) modified by 1,3-dihexadecyl-3H-benzimidazolium bromide (Bz) was used to prepare polyphenylene sulfide (PPS)/MMT composites by melting intercalation. The PPS/MMT composites showed mixed morphology, being comprised of exfoliated and intercalated structures with slight agglomerates. The tensile property of PPS/MMT composites was significantly improved due to the good dispersion of the MMT nanolayers. The test results showed that the tensile strength retention of PPS/MMT composites was higher than that of pure PPS after the oxidation treatment. Moreover, FTIR and XPS analyses were also used to evaluate the oxidation resistance of PPS composites. The FTIR analysis confirmed that adding MMT could better limit the damage of the C–S group and retard the generation of sulfuryl groups (–SO2–) during the oxidation treatment compared to pure PPS. The XPS analysis also suggested that the addition of MMT could reduce the chemical combination of the elements sulfur (S) and oxygen (O) during oxidation treatment. Furthermore, the MMT nanolayers could also promote the transfer of S from a C–S bond into an –SO2– group.
Highlights
Polyphenylene sulfide (PPS) is an attractive high-performance thermoplastic polymer which possesses high thermal stability, good mechanical properties and excellent fire resistance [1,2,3,4].Due to its outstanding performance, polyphenylene sulfide (PPS) has been widely applied in the field of high temperature filtration [5,6]
It can be observed that no new diffraction peak appears except the diffraction peak of the PPS matrix when the content of Bz–MMT is less than 1 wt % for PPSBMx composites
The addition of Bz–MMT can significantly improve the tensile strength of PPS
Summary
Polyphenylene sulfide (PPS) is an attractive high-performance thermoplastic polymer which possesses high thermal stability, good mechanical properties and excellent fire resistance [1,2,3,4]. The direct addition of nanoparticles or antioxidants is commonly used to improve the oxidation resistance of PPS. In contrast with adding nanoparticles, the addition of antioxidants may create a wide range of problems, such as poor thermal stability of antioxidants, volatility of antioxidants during the melt processing, easy precipitation from the polymer matrix and low extraction resistance by the organic solvent. The surface coating method can be used to improve the oxidative stability of PPS fiber products [15,16]. Among those nanofillers used in the direct addition method, the MMT nanolayers have attracted intensive attention due to their excellent oxygen barrier properties. The antioxidative mechanism of the MMT nanolayers on PPS resin was reported in this work
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