Preparation of nano-SiO2 compound antioxidant and its antioxidant effect on polyphenylene sulfide

2019 ◽  
Vol 39 (6) ◽  
pp. 556-564
Author(s):  
Wenxin Han ◽  
Jianjun Lu ◽  
Jingyi Ren ◽  
Dandan Lian ◽  
Junde Xing
Keyword(s):  
Comprehensive Analysis ◽  
Antioxidant Effect ◽  
Polyphenylene Sulfide ◽  
Sem Images ◽  
Melt Compounding ◽  
Multi Stage ◽  
Oxidation Induction Temperature ◽  
Oxidation Model ◽  
Dynamic Oxidation ◽  
Induction Temperature

Abstract Polyphenylene sulfide (PPS) is easily oxidized at high temperature, which greatly limits its applications. In this study, a nano-SiO2 compound antioxidant (SiO2-g-AO) was prepared and incorporated into PPS by melt compounding to obtain PPS/SiO2-g-AO composites. SiO2-g-AO was prepared by reacting 3-(3,5-di-tert-butyl-4-hydroxyphenyl) (antioxidant AO) with an aminosilane coupling agent (KH792). Fourier transform infrared (FTIR) spectroscopy, energy dispersive spectroscopy (EDS) and thermogravimetric analysis (TGA) confirmed that the antioxidant AO was successfully immobilized on the surface of SiO2 and the thermal stability was improved. Scanning electron microscopy (SEM) images showed that SiO2-g-AO was uniformly dispersed in PPS. It has been found that the crystallinity and mechanical properties of PPS composites improved, and the dynamic oxidation induction temperature (OIT) increased in the range of 16.7°C–21.1°C. A synergistic anti-oxidation model of nanoparticles and antioxidants, namely a multi-stage antioxidant system, was established by comprehensive analysis of experimental results. The synergistic anti-oxidation model provides a new idea for the antioxidant modification of polymer composites.

Effect of montmorillonite on the oxidative stability of polyphenylene sulfide fibers prepared by melt spinning

2021 ◽  
pp. 004051752110134
Author(s):  
Jian Xing ◽  
Shunhua Dai ◽  
Zhong Chen ◽  
Yongkang Wang ◽  
Zhenghua Zhang ◽  
...  
Keyword(s):  
Oxidative Stability ◽  
Melt Spinning ◽  
Breaking Strength ◽  
Strength Loss ◽  
Polyphenylene Sulfide ◽  
Composite Fibers ◽  
Oxidation Treatment ◽  
Transmission Electron ◽  
Chemical Combination ◽  
Induction Temperature

Masterbatches of polyphenylene sulfide (PPS)/organic montmorillonite (MMT) composites were produced via melt blending. A self-made spinning equipment was then used to produce the PPS/organic MMT composite fibers by melt spinning directly from the masterbatches. X-ray diffractometer and transmission electron microscope were used to examine the dispersibility of organic MMT. The morphology, tensile property, crystallization behavior, and oxidative stability of PPS fibers were investigated. The results indicated that organic MMT could be uniformly distributed in the PPS matrix to form a mixed dispersion of intercalated and exfoliated structure and influence the longitudinal surface morphology of fibers to become rough. The roughness of composite fibers surface was proportional to the content of organic MMT. The organic MMT nanolayers could act as the heterogeneous nucleating agents to improve the crystallization, and the crystallity of composite fibers increased with the increase of organic MMT content. The breaking strength of composite fibers first increased and then decreased by increasing the amount of organic MMT. After the oxidation treatment, the breaking strength of neat PPS fibers and composite fibers declined, but the degree of breaking strength loss for composite fibers is lower than that of neat PPS fibers. The dynamic oxidation induction temperature of composite fibers also showed a significant increase by adding organic MMT. Moreover, the addition of organic MMT could limit the chemical combination of element sulfur and oxygen, retard the generation of sulfoxide groups, and induce the conversion of sulfur atoms from C-S bond to sulfone for improving oxidative stability.

scholarly journals Comparing the elasticity of the melt and electrical conductivity of the solid of PP-HDPE copolymer CNT composites obtained by direct compounding versus dilution of a PP masterbatch

2020 ◽  
pp. 1045389X2096983
Author(s):  
Erika Palacios-Aguilar ◽  
Jaime Bonilla-Rios ◽  
Jose Antonio Sanchez-Fernandez ◽  
Adriana Vargas-Martinez ◽  
Jorge de J Lozoya-Santos ◽  
...  
Keyword(s):  
Elastic Properties ◽  
Multiwall Carbon Nanotubes ◽  
Random Copolymer ◽  
Elongational Viscosity ◽  
Fiber Spinning ◽  
Addition Method ◽  
Sem Images ◽  
Melt Compounding ◽  
Blown Film ◽  
Multiwall Carbon

Composites of multiwall carbon nanotubes (CNT) at 1, 2, and 3 wt.% on a polypropylene–polyethylene random copolymer matrix were prepared by melt compounding CNT powder and by dilution of a commercial polypropylene masterbatch (PMB). While the shear viscosity shows similar behavior for both dilution modes, the differences in their elastic properties clearly show the effect of the addition method and the presence of the PMB. This also indicates the relevance of having a difficult to mix masterbatch to enhance the elongational viscosity of the composites for free wall applications such as fiber spinning and blown film. On the other hand, the 2 and 3 wt.% CNT composites from both addition modes have similar electrical conductive behavior, with values near the semiconductors’ range. TEM and SEM images show different states of dispersion for each source of CNT. The immiscibility observed in those images is the simplest explanation for the differences in the molten composites’ elastic properties due to direct CNT addition versus CNT addition by dilution of a PMB.

scholarly journals Glycerine Treated Nanofibrillated Cellulose Composites

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Esra Erbas Kiziltas ◽  
Alper Kiziltas ◽  
Behzad Nazari ◽  
Douglas J. Gardner ◽  
Douglas W. Bousfield
Keyword(s):  
Elastic Modulus ◽  
Flexural Modulus ◽  
Nanofibrillated Cellulose ◽  
Sem Images ◽  
Low Frequencies ◽  
Melt Compounding ◽  
Cellulose Composites ◽  
Strong Shear ◽  
Styrene Maleic Anhydride ◽  
Thermal Stability Of

Glycerine treated nanofibrillated cellulose (GNFC) was prepared by mixing aqueous nanofibrillated cellulose (NFC) suspensions with glycerine. Styrene maleic anhydride (SMA) copolymer composites with different loadings of GNFC were prepared by melt compounding followed by injection molding. The incorporation of GNFC increased tensile and flexural modulus of elasticity of the composites. Thermogravimetric analysis showed that as GNFC loading increased, the thermal stability of the composites decreased marginally. The incorporation of GNFC into the SMA copolymer matrix resulted in higher elastic modulus (G′) and shear viscosities than the neat SMA copolymer, especially at low frequencies. The orientation of rigid GNFC particles in the composites induced a strong shear thinning behavior with an increase in GNFC loading. The decrease in the slope of elastic modulus with increasing GNFC loading suggested that the microstructural changes of the polymer matrix can be attributed to the incorporation of GNFC. Scanning electron microscopy (SEM) images of fracture surfaces show areas of GNFC agglomerates in the SMA matrix.

Enhancing Mechanical Properties of Polyvinyl Alcohol Fiber Reinforced High Density Polyethylene Composites

2018 ◽  
Vol 777 ◽  
pp. 27-31
Author(s):  
Achmad Chafidz ◽  
Ariany Zulkania ◽  
Tintin Mutiara ◽  
Prima A. Handayani ◽  
Muhammad Rizal
Keyword(s):  
Mechanical Properties ◽  
Polyvinyl Alcohol ◽  
Tensile Test ◽  
High Density Polyethylene ◽  
High Density ◽  
Sem Images ◽  
Melt Compounding ◽  
Twin Screw ◽  
Pva Fiber ◽  
Surface Morphologies

In this work, high density polyethylene (HDPE)/polyvinyl alcohol (PVA) fiber composites have been fabricated via melt compounding by employing a twin-screw extruder. The resulted composites samples of four different PVA loadings (i.e. 0, 5, 10, 20 wt%) were then characterized via tensile test to investigate the effect of PVA loadings on their mechanical properties (i.e. modulus elasticity, tensile strength, toughness, and strain at break). Additionally, the surface morphologies of the composites (i.e. cryo-fractured and tensile fractured samples) were also studied by using a scanning electron microscopy (SEM). The SEM micrographs on the cryo-fractured sample showed that PVA fibers were perfectly embedded and well blended in HDPE matrix. Whereas, the SEM images of tensile-fractured samples showed that there was a fibrillation effect on the neat HDPE, while in the composites sample, there was an evident of broken fibers. Additionally, from the tensile test results, the modulus elasticity of the composites has increased by approximately 16, 39, and 81% (as compared to the neat HDPE) for PVAC-5, PVAC-10, and PVAC-20, respectively. Whereas, the toughness and strain at break of the composites have decreased.

Effects of the Coupling Agent on the Mechanical Properties of Long Glass Fiber Reinforced Polyphenylene Sulfide Composites

2015 ◽  
Vol 815 ◽  
pp. 509-514 ◽  
Author(s):  
Zhao Liu ◽  
Yu Qian Wu ◽  
Xiao Jun Wang ◽  
Sheng Ru Long ◽  
Jie Yang
Keyword(s):  
Mechanical Properties ◽  
Fracture Surface ◽  
Glass Fiber ◽  
Coupling Agent ◽  
Fiber Length ◽  
Glass Fibers ◽  
Optical Microscope ◽  
Polyphenylene Sulfide ◽  
Sem Images ◽  
Long Glass Fiber

In this paper, we investigated the effects of a coupling agent (KH560) on the mechanical properties of long glass fiber (LGF) reinforced polyphenylene sulfide (PPS) composites. The LGF reinforced PPS composites were prepared utilizing our self-designed mold. It’s found that KH560 was beneficial for improving the mechanical properties of the composites. Meanwhile, the fiber lengths of glass fibers in the original injection molded sample and near the fracture surface were measured under the optical microscope. Comparing to the untreated sample, the sample with KH560 possessed higher proportion of fiber length on 0.75-1.25 mm. It suggested that KH560 could protect glass fibers from broken. Meanwhile, near the fracture surface, two composites possessed similar proportions of fiber length on 0-0.75 mm. That indicated KH560 improved the interfacial bonding between glass fiber and PPS. Scanning electron microscopy (SEM) images showed that more resin adsorbed on the fiber surface, which was consistent with the above phenomena.

Study of the Effects of Treatment Conditions on the Hydrophility of Modified Polyphenylene Sulfide Nonwoven Induced by Low Temperature Plasma

2014 ◽  
Vol 1033-1034 ◽  
pp. 1220-1226
Author(s):  
Zhi Bin Xu ◽  
Ying Na Li ◽  
Xue Lian Chen
Keyword(s):  
Low Temperature ◽  
Absorption Rate ◽  
Graft Polymerization ◽  
Polyphenylene Sulfide ◽  
Low Temperature Plasma ◽  
Sem Images ◽  
Temperature Plasma ◽  
Treatment Conditions ◽  
Plasma Effects ◽  
Alkali Absorption

The polyphenylene sulfide (PPS) Nonwoven was modified by grafting polymerization of the acrylic acid (AA) with the initiation of the low temperature plasma. Effects of different treatment conditions on the graft reaction and the hydrophility of the modified PPSs were investigated. Scanning electron microscopy (SEM) images showed that the graft polymerization only occurred on the surface of PPS. The hydrophility of the PPS nonwoven were examined by alkali absorption rate. The results show that the optimum modified conditions are 90s treating time, 50W plasma power and 1.5cm distance between of the electrodes.

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