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Synthesis and properties of acrylonitrile-butadiene-styrene copolymer containing silica nanoparticles |
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| รหัสดีโอไอ | |
| Title | Synthesis and properties of acrylonitrile-butadiene-styrene copolymer containing silica nanoparticles |
| Creator | Charungkit Chaikaew |
| Contributor | Kawee Srikulkit |
| Publisher | Chulalongkorn University |
| Publication Year | 2560 |
| Keyword | Copolymers, Nanocomposites (Materials), Silica, โพลิเมอร์ผสม, นาโนคอมพอสิต, ซิลิกา |
| Abstract | The aim of this research is to develope acrylonitrile butadiene styrene composite reinforced with hydrophobic silica nanoparticles. In this study, in-situ synthesis of ABS rubber particles containing hydrophobic silica nanoparticles (HDTMS-silica) was carried out. Firstly, three of HDTMS-silicas (HDTMS-silica1, HDTMS-silica2, and HDTMS-silica3) were prepared by silanization of SiO2 nanoparticle with hexadecyltrimethoxysilane (HDTMS : SiO2 wt ratios of 1 : 1, 2 : 1, and 3 : 1) in an emulsion system. Then, HDTMS-silica/styrene and acrylonitrile mixture was fed into a polybutadiene latex reactor. Following that, graft copolymerization was carried out using persulfate initiator at temperature of 65 oC for 3.5 h. Thus obtained ABS rubber containing HDTMS-silica was melt extruded with styrene-acrylonitrile (SAN) to prepare ABS nanocomposite compound. Mechanical properties of ABS nanocomposite compounds were evaluated. It was found that all of HDTMS : SiO2 wt ratios produced hydrophobic SiO2 nanoparticles exhibiting good dispersibility in toluene test. In fact, 3 :1 HDTMS : SiO2 showed the complete hydrophobicity modification, judged by the absence of silanol absorption band. However, the optimum mechanical properties were achieved at 2 wt% loading of 2 : 1 HDTMS : SiO2. Below 2 : 1 ratio, the HDTMS ratio was not enough to obtain the fully hydrophobic surface modification. Above 2: 1 ratio, the excessive HDTMS ratio led to a decrease in SiO2 content judged by Si EDX mapping, causing a gradual decrease in its energy absorption and reinforcement performance. In case of 2 : 1 HDTMS : SiO2, optimum mechanical properties were achievable at 2 wt% HDTMS-SiO2 loading, resulting from the optimum dispersibility of HDTMS-SiO2 nanoparticles. Further increase in HDTMS-SiO2 loading resulted in a reverse effect due to agglomeration problem. Moreover, the ABS-g-MAA and ABSSi-g-MAA were successfuly prepared and then melt-mixed with PLA to obtain PLA/ABS-g-MAA and PLA/ABSSi-g-MAA blends using an internal mixer. The impact strength of the blends is dependent on the percent loading of ABS-g-MAA and ABSSi-g-MAA. The percent loading of ABS-g-MAA and ABSSi-g-MAA played and important role in control the flexibility of the blends. |
| URL Website | cuir.car.chula.ac.th |
