Nano-Alumina Modified Polymer
(1) Modified Polyolefin.
Due to industrial production needs higher strength, wear resistance and stronger engineering and functional materials with special functions, so the study is particularly active in polyolefines modification at home and abroad, through the nano modified polyolefin resin, strength, toughness and electric properties generally can be improved, its application field is also growing.
In recent years, the modification of polyolefin by nano-alumina has been one of the hot topics in 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 energy storage modulus of UPR/Nano-Al2O3 are the maximum.
Polymethyl methacrylate (PMMA)/acrylonitrile - styrene-acrylate terpolymer (ASA) alloy was prepared by melt blending method. With the increase of Nano-Al2O3 content, the surface wear decreases greatly.
(3) Modified Polyamide.
Nano-Al2O3 modified Nadiximide composite was prepared by sol-gel technique. With the increase of Nano-Al2O3 content, the corona resistance of the material is significantly enhanced.
PA6 / nano-al2o3 composite was prepared by melting and blending with nylon 6 (PA6) after surface treatment with silane coupling agent KH-560. Nano-Al2O3 plays a heterogeneous nucleation role in the crystallization of PA6, which restricts the movement of PA6 molecular chain and increases the glass transition temperature and crystallinity of composites.
(4) Modified Rubber.
Liquid silicone rubber (SiR)/nano-Al2O3 was prepared, and the space charge characteristics of nano-Al2O3 mass fraction on SiR were measured by electro-acoustic pulse method. With the increase of nano-al2o3 mass fraction, the space charge accumulation of SiR sample increases under the same applied field strength, and dissipates more rapidly after pressure removal.
The mixed system of NBR/nano Al2O3 was investigated by sem and TGA. When nano-Al2O3 is 2.5% of NBR mass, the tensile strength of NBR/nano-Al2O3 is 15% higher than that of pure NBR. The elongation at break of the composite decreases from 224% (pure NBR) to 159% (NBR/nano-Al2O3) when nano-Al2O3 is 7.5% of NBR mass.
At the same time, the addition of nano-Al2O3 can improve the thermal stability of the mixed system. When the addition amount of nano-Al2O3 is 5% of the mass of NBR, the maximum thermal weight loss temperature of NBR/nano-Al2O3 is 3℃ higher than that of pure NBR.
