“…In addition, the coupling agent used in the blend system belonged to a micromolecular compound. One part of the excessive modifying agents could act as the impurity, and another part could work as a plasticizer to a certain extent; this made the consistency bad and decreased the tensile strength and elongation at break in the blend system. So, the optimal amount of KH‐570, KH‐550, or GMS is 1 wt %.…”
Starch was treated with three kinds of compatibilizers (coupling agents or modifying agents), KH-550, KH-570, and glycerin monostearate. Blends of polypropylene (PP) and treated starch were prepared by a twin-screw extruder. The effects of the starch before and after treatments and the kinds and contents of the compatibilizers on the mechanical and thermal properties of the PP/ starch blends were investigated in this study. We found that the mechanical properties (tensile strength, impact strength, and elongation at break) of the blends were obviously improved with increasing content of different kinds of compatibilizers. Meanwhile, the most significant improvement in the mechanical properties was obtained in the samples containing just a 1 wt % loading of compatibilizers, and KH-570 had the best improved effects among the different kinds of compatibilizers. The results of thermogravimetric analysis demonstrate that to some extent, the thermal stability of the PP/starch blends was improved after the addition of compatibilizers. Scanning electron microscopy showed that the dispersion of starch in the PP matrix and adhesion between the starch and PP matrix were obviously improved after the addition of compatibilizers. KH-570 not only had the best improved effects among the coupling agents but also still acted as a similar plasticizer.
“…In addition, the coupling agent used in the blend system belonged to a micromolecular compound. One part of the excessive modifying agents could act as the impurity, and another part could work as a plasticizer to a certain extent; this made the consistency bad and decreased the tensile strength and elongation at break in the blend system. So, the optimal amount of KH‐570, KH‐550, or GMS is 1 wt %.…”
Starch was treated with three kinds of compatibilizers (coupling agents or modifying agents), KH-550, KH-570, and glycerin monostearate. Blends of polypropylene (PP) and treated starch were prepared by a twin-screw extruder. The effects of the starch before and after treatments and the kinds and contents of the compatibilizers on the mechanical and thermal properties of the PP/ starch blends were investigated in this study. We found that the mechanical properties (tensile strength, impact strength, and elongation at break) of the blends were obviously improved with increasing content of different kinds of compatibilizers. Meanwhile, the most significant improvement in the mechanical properties was obtained in the samples containing just a 1 wt % loading of compatibilizers, and KH-570 had the best improved effects among the different kinds of compatibilizers. The results of thermogravimetric analysis demonstrate that to some extent, the thermal stability of the PP/starch blends was improved after the addition of compatibilizers. Scanning electron microscopy showed that the dispersion of starch in the PP matrix and adhesion between the starch and PP matrix were obviously improved after the addition of compatibilizers. KH-570 not only had the best improved effects among the coupling agents but also still acted as a similar plasticizer.
“…1 c, the HDMS was hydrolyzed and condensed on the surface of carbonyl iron-SiO 2 . In addition, due to the sensitivity of conversion rates to the presence of acids and bases, ammonia solution was employed as a catalyst for all processes 1 , 2 , 37 – 40 . Figure 1 Mechanism of carbonyl iron reaction with ( a ) SiO 2 , ( b ) SiO 2 @FAS, and ( c ) SiO 2 @HDMS.…”
Section: Resultsmentioning
confidence: 99%
“…Also, at 845 and 1255 cm −1 , FT-IR signals linked with Si–C were found 37 . The wide band about 3500 cm −1 shows the stretching of several OH groups; this peak was gotten weaker by adding HDMS and FAS to the surface of CI/SiO 2 , indicating that the OH groups had been replaced by silane bands 40 , 42 – 44 . Figure 2 FTIR of carbonyl iron and modified hydrophobic particles with SiO 2 , SiO 2 @FAS, and SiO 2 @HDMS.…”
The present study demonstrated the wettability properties of grafting silane coupling agents on carbonyl iron (CI)/SiO2 particles for efficient oil/water mixture and emulsion separation. CI particles were first reacted with Tetraethoxysilane (TEOS) to create a magnetic component. Then, CI/SiO2 particles were altered by 1H,1H,2H,2H-perfluorodecyltriethoxysilane (FAS) and Hexamethyldisilazane (HDMS) to create magnetic superhydrophobic/superoleophilic, recyclable, and reusable sorbent powders. The water contact angle (WCA) values of the as-prepared particles, CI, CI/SiO2, CI/SiO2@FAS, and CI/SiO2@HMDS, were 5.4° ± 1.3°, 6.4° ± 1.4°, 151.9° ± 2.1°, and 170.1° ± 1.1°, respectively. In addition, the oil contact angles (OCAs) of a variety of oils were found to be equivalent to 0°. Hence, superhydrophobic/superoleophilic particles for kind of different oils were shown sorption capacities of 1.7–3.1 g/g and 2.5–4.3 g/g for CI/SiO2@FAS, and CI/SiO2@HMDS, respectively. Besides, for 1%w/w hexane/water emulsion separation efficiency higher than 99%, the lowest mass was obtained at 50 and 200 mg for CI/SiO2@HDMS and CI/SiO2@HDMS, respectively, suggesting a new effective material for separating tiny oil droplets. Also, the reusability and chemical durability of the superhydrophobic samples made them a prime candidate for use in different harsh conditions.
“…The surface modification by coupling agent doping is regarded as a simple and cheap method, which is beneficial to impedance matching [14][15]. Feng et al reported of CIP with silane coupling agent KH550 [16], and Song et al used the surface modification with nanostructure polymer coated on flake CIPs [17]. In addition, the coupling agent can improve the compatibility between the filler and the rubber matrix and change the surface of the absorbing material from hydrophilic to hydrophobic [18].…”
In this paper, the impedance matching of the flaky carbonyl iron was improved by surface modification with binary coupling agents. The microstructure, phase and electromagnetic parameters were detected by scanning electron microscope (SEM), X-ray diffraction (XRD) and Agilent vector network analyzer, respectively. After binary coupling agent applied, the shape and particle size of the flaky CIP have changed significantly, whereas the phase remained α-Fe phase.On the other hand, with the addition of binary coupling agents, the complex permittivity of flaky CIP is reduced, which is beneficial to impedance matching. The doping with 2wt% calcium stearate and 2ml titanate to flaky CIP has a minimum reflection loss peak of −13 dB at the thickness of 2 mm. It is noted that the effective absorption bandwidth (RL<-10dB) is up to 0.8GHz (1.8~2.6GHz). Moreover, the magnetic tangent loss of the samples can be significantly improved by the addition of binary coupling agents. Therefore, the surface modification of binary coupling agent can make flaky CIP get better impedance matching and absorbing performance in S
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