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| Effects of Hygrothermal Environment on Properties of PMMA Hybrid Nanocomposites |
| Received:September 13, 2017 Revised:February 15, 2018 |
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| DOI：10.7643/ issn.1672-9242.2018.02.007 |
| KeyWord:graphene oxide carbon nanotubes hygrothermal properties dynamic mechanical analysis electrical conductivity |
| Author | Institution |
| WANG Bai-chen |
Faculty of Aerospace Engineering, Department of Aerospace Engineering, Shenyang Aerospace University, Shenyang , China |
| LIU Yong-na |
Faculty of Aerospace Engineering, Department of Aerospace Engineering, Shenyang Aerospace University, Shenyang , China |
| LI Wei |
Faculty of Aerospace Engineering, Department of Aerospace Engineering, Shenyang Aerospace University, Shenyang , China |
| GAO Yu |
Faculty of Aerospace Engineering, Department of Aerospace Engineering, Shenyang Aerospace University, Shenyang , China |
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| Abstract: |
| Objective To study effects of hygrothermal environment on properties of polymethyl methacrylate (PMMA) nanocomposite. Methods A methyl methacrylate (MMA) in water Pickering emulsion stabilized by EMI/GO/CNTs, hybrid emulsion stabilizers, was prepared. PMMA nanocomposites were obtained via Pickering suspension polymerization with azobisisobutyronitrile (AIBN) as initiator. PMMA nanocomposites were molded by compression molding. Moisture absorption experiments were carried out at room temperature and 50 ℃ respectively. Pickering emulsion droplets were analyzed by optical microscopy, and dynamic mechanical analysis, quality test, conductivity test were taken to value glass transition temperature, moisture absorption rate and electrical conductivity of the composites. Results The oil in water Pickering emulsion stabilized by EMI/GO/CNTs, with MMA as oil phase, showed good stability. The droplet size distribution range was narrow and the droplet distribution was homogeneous. The moisture absorption of the composite increases with time and was basically unchanged after the equilibrium state of moisture absorption was achieved. The moisture absorption rate and equilibrium moisture absorption rate of water immersion composite materials were different at different temperatures. The moisture absorption rate of the composite at 50 ℃ was faster than that at 25 ℃, and the rate of equilibrium moisture absorption was greater than that of 25 ℃. The glass transition temperature of composites was almost unchanged under hygrothermal conditions. The conductivity of composite after hygrothermal test was increased by 1~2 orders of magnitude than that of dry composite. Conclusion PMMA composite is prepared after the formation of stable Pickering emulsion with novel GO/CNTs hybrid emulsion stabilizer EMI/GO/CNTs as a particle stabilizer, via Pickering suspension polymerization, which is used to elaborate PMMA composites through compression molding technique. The moisture absorption rate and electrical conductivity of the composite materials after the hygrothermal test are partially changed. Glass transition temperature of the composite materials is basically unchanged. |
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