Based on general engineering and plastics, the strength, flame resistance as well as impact resistance, toughness of the material, its aging resistance, and antibacterial properties of plastics can be enhanced by filling, blending, strengthening and other methods.
How can nano materials modify plastics?
1. Aging resistance of reinforced plastics
The aging process for polymer materials including photooxidation, starts on the surface of materials or products like discoloration cracking, pulverization decline and so on, before gradually advancing in the inner. The anti-aging properties of polymers directly affect the longevity of its service and environment, especially for polymers used for agriculture and plastic building materials, which is not solely a factor that requires special attention, but also an important part of polymer chemical science. The wavelength of UV in sunlight is 200400nm. Similarly, the ultraviolet in the band 280400nm may destroy the polymer molecular chain that causes the material to undergo aged. Nano-oxides such alumina, nano Nano-titanium dioxide, nano-silica and many others, have great absorption properties for Infrared as well as microwave. A proper mix of nano SiO2 and TiO2 will absorb a significant amount of ultraviolet rays to stop plastics from being damaged by sunlight. They also help to stop plastics from cracking, discoloration , and degrading effects caused by sunlight, making the material anti-aging.
2. Improve the anti-mildew and antibacterial properties of plastics
Antibacterial plastics are typically prepared by adding antimicrobial agents or antibacterial masterbatch in the resin. Because plastic molding is required to go through high temperature and pressure, there are organic antimicrobial agents that can adapt to high temperature. Metal powders that are traditionally used to combat bacteria such as copper sulfate , zinc nutrients aren't easy to incorporate directly into thermoplastics. The inorganic nano-antibacterial material is treated to obtain antibacterial plastic masterbatch, which is easy to use in plastic items and has good interaction with plastics. It's useful for the dispersal of antimicrobial ingredients. Inorganic silver ions are integrated into nano-titanium dioxide or nano-silicon aluminium oxide, and other nano-materials made of inorganic materials, and the resulting powder exhibits good antibacterial qualities, when blended with plastics and extruded and molded by ultraviolet irradiation in order to make antibacterial plastics. its antibacterial properties are derived by the slow release of antimicrobial substances, in order to produce the antibacterial effect.
3. Increase the strength and toughness of plastics
When the second material adds the second substance to the matrix, the composite is created, and a more comprehensive material is obtained by compounding, which can improve the mechanical strength and impact strength of the material. Nanomaterials' development provides an entirely new approach and method for reinforcement and modifications of polymers. The defects on the surface of the small-sized particles dispersed in phase are relatively few and there are a lot of unpaired electrons. The ratio of the surface atomic number to the total number of nanoparticles increases sharply as particles decrease in size. In the environment of crystal fields and bonding energy of surface particles differ from the ones that are internal atoms. Hence, they are very active in chemical processes. With the micronization of crystal field and an increase of active surface atoms the surface energy is significantly increased, which means it can be very closely linked with the polymer substrate and is good compatibility. If it is subjected externally it is so easy to release from the substrate . This allows it to better transfer external stress. However due to the interaction with the stress field with the substrate, there will be more microcracks , and plastic deformations within the substrate that can cause the substrate to yield and consume more energy from impacts, so as to attain the goal of strengthening and toughening simultaneously. Nano-materials that are most commonly utilized are nano Alumina, nano silica, nano-calcium carbonate, etc.
4. Enhance the thermal conductivity of plastics
Thermal conductive plastics comprise a kind of plastic that has the highest thermal conductivity. These are typically higher than 1wper (m. km.). The thermal conductive plastics are becoming more and more widely used because of their lightweight with a high thermal conductivity. They are also fast, easy injection moldings, low processing costs, and so on. Because of its high insulation and thermal conductivity, nano-alumina has been extensively utilized in thermal conductive plastics, thermal conductive rubbers, thermal construction age, thermally conductivity coatings, and many other fields. It is different from fillers made of metal. nano-alumina can not only enhance the thermal conductivity but also increase the insulation effect, as well as the mechanical properties of plastics could also be improved.
5. Enhance the processability of plastics
Certain polymers such as high molecular weight polyethylene (UHMWPE) which has a viscosity standard molecular weights that exceed 150 minutes, exhibit excellent broad properties, however they are difficult to be produced and processed due their high viscosity, which hinders the use of and acceptance. Making use of the low interlaminar friction coefficient of Silicate layer, the nano-rare Earth / ultra-high weight polyethylene composite was made by mixing UHMWPE with layers of silicate, which reduces the interaction of UHMWPE molecular chain and reduce the viscosity. A key part of lubricationand greatly improve its ability to process.
6. The addition of nanomaterials makes plastics functional.
Metal nanoparticles are heterogeneous in their nucleation that can trigger the formation and formation of different crystal structures that add toughness on the substrates. When polypropylene contains metallic nanoparticles with low melting points it is revealed that it may play the role of conductive channel, enhancing and tamping out in polypropylene also its low melting improves the processability of the composites.
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