Nano-Alumina Modified Polymer
(1) Modified Polyolefin.
Because industrial production requires engineering and functional materials with higher strength, stronger wear resistance and special functions, nano-alumina is widely used in polyolefin modification.
The strength, toughness and electrical properties of the nano-modified polyolefin resin can be generally improved, and its application fields are also expanding. In recent years, the research of nano-alumina modified polyolefin has been one of the hot spots of nano-modification research.
(2) Modified Polyester.
When the addition amount of nano-Al2O3 is 5%, the tensile strength, bending strength, impact strength, glass transition temperature and storage modulus of UPR/nano-Al2O3 are all the highest.
Polymethyl methacrylate (PMMA)/acrylonitrile-styrene-acrylate terpolymer (ASA) alloy was prepared by melt blending and the effect of nano-Al2O3 content on the properties of PMMA/ASA alloy was investigated.
The results show that with the increase of nano-Al2O3 content, the surface wear amount of the alloy is greatly reduced.
(3) Modified Polyamide.
Nano-Al2O3-modified Nadicimide composites were prepared by sol-gel technique, and the effects of nano-Al2O3 additions on the corona resistance and heat resistance of the composites were studied.
The results show that with the increase of nano-Al2O3 content, the corona resistance of the material is significantly enhanced;
Nano-Al2O3 was surface-treated with silane coupling agent KH-560 and then melt-blended with nylon 6 (PA6) to prepare PA6/nano-Al2O3 composites. The effects of raw material ratio and cooling rate on the crystallization properties of PA6/nano-Al2O3 composites were investigated.
The results show that nano-Al2O3 plays a heterogeneous nucleation role in the crystallization process of PA6, which restricts the movement of PA6 molecular chains and increases the glass transition temperature and crystallinity of the composites.
(4) Modified Rubber.
The effect of nano-Al2O3 mass fraction on the space charge characteristics of SiR was measured by electroacoustic pulse method.
According to the space charge dissipation process, the trap depths of SiR with different nano-Al2O3 mass fractions were calculated, and the influence mechanism of space charge on the performance of SiR was analyzed.
The test results show that with the increase of the mass fraction of nano-Al2O3, under the same applied field strength, the space charge accumulation of the SiR sample increases and dissipates more rapidly after the pressure is removed.
The mixed system of nitrile rubber (NBR)/nano-Al2O3 was studied by scanning electron microscopy and thermogravimetric analysis.
The results show that when the amount of nano-Al2O3 is 2.5% of the mass of NBR, the tensile strength of NBR/nano-Al2O3 is 15% higher than that of pure NBR; when the amount of nano-Al2O3 is 7.5% of the mass of NBR, the tensile strength of the composite The elongation at break decreased from 224% (pure NBR) to about 159% (NBR/nano-Al2O3).
At the same time, the addition of nano-Al2O3 can improve the thermal stability of the mixed system. When the addition of nano-Al2O3 is 5% of the mass of NBR, the maximum thermogravimetric temperature of NBR/nano-Al2O3 is 3℃ higher than that of pure NBR.
Nano-alumina has a wide range of applications in the modification of polymers.
The addition of nano-Al2O3 can greatly improve the mechanical properties, surface properties, electrical properties and thermal properties of the polymer.
