Based on general chemical and engineering plastics the strength, elasticity, flame retardancy, impact resistance, toughness as well as antibacterial properties of plastics can be enhanced by filling, blending or strengthening in addition to other methods.
How can nano materials modify plastics?
1. Aging resistance of reinforced plastics
The process of aging polymer materials and products, specifically photooxidation aging starts from the surface of products or materials such as discoloration cracking, pulverization, glossiness reduction, and so on, but then it gradually gets deeper into the interior. The properties of polymers that prevent aging directly affect the longevity of its service as well as its environment, particularly in the case of agricultural plastics as well as plastic building materials, which is not an only a measure that requires special attention, but also an important part of polymer chemicals. The wavelength for ultraviolet light is 200-400nm. The ultraviolet spectrum in the 280400nm range can rupture the molecular chain in polymer and cause the material to begin aging. Nano-oxides, such as nano-alumina and nano-titanium oxide and so on, possess excellent absorption properties in the infrared and microwave. Nano-oxides that are properly mixed with SiO2 and TiO2 can absorb an enormous amount of ultraviolet rays to keep plastics safe from damage due to sunlight. They also aid in preventing plastic products from breaking, discoloration or signs of degradation caused by light. This makes the materials anti-aging.
2. Improve the antibacterial and anti-mildew properties of plastics
Antibacterial plastics are generally prepared by including antimicrobial compounds or masterbatch to the resin. Because plastic molding must go through high temperature, there are inorganic antimicrobial agents that are able to adapt to the extreme temperature. Traditional antibacterial metal powders , such as copper sulfate and zinc Nitrate are difficult to use directly in thermoplastics. Inorganic nano-antibacterial particles are created to create an antibacterial plastic masterbatch. It's easy to use in plastic products and has excellent integration with plastic. It can aid in the dispersion of antimicrobial agents. Silver ions from inorganic sources can be used to form nano titanium dioxide or nano-silicon aluminium oxide, and other nano-materials made of inorganic materials, and this powder is characterized by antibacterial properties. It can be in combination with plastics, extruded in the form of ultraviolet radiation creating antibacterial plastics. The antibacterial effects are produced through the gradual release of antimicrobial compounds, so as to achieve the antibacterial effects.
3. Increase the toughness and durability of plastics
When the second substance are added to the polymeric mat, a composite is formed, and a more comprehensive material is obtained through compounding which helps to increase the mechanical strength and impact toughness of the material. The emergence of nanomaterials provides an exciting method to enhance the strength and transformation of materials. The defects on the surface of the small-sized particles dispersed in phase are very few, and they are filled with non-paired particles. The ratio of the surface number of atoms to the total number of nanoparticles increases dramatically as the particle decreases in size. Crystal field environments and the binding energy of surface atoms differ from the ones of internal atoms, so they are extremely active chemically. Due to the micronization of the crystal field and the increase in active surface atoms, surface energy is significantly enhanced, so it can be very closely linked with the polymer substrate. This results in great compatibility. If subjected for external force this ion is as easy to remove from the substrate and can better transfer the external pressure. Also, under the interaction of the stress field and the stress field, there are more cracks and plastic deformations that occur in the substance, which could cause the substrate's surface to yield and also consume lots of impact energyin order to accomplish the goal of toughening and strengthening simultaneously. The most common nano-materials utilized are nano micro silica, nano alumina nano-calcium carbonate and others.
4. Improve the thermal conductivity of plastics
The thermoconductive plastics are class of plastics with high thermal conductivity, which typically exceeds 1Wper (m. k). The thermal conductive plastics are becoming more and more widely utilized because of their light weight quick thermal conductivity, simple injection molding, low processing costs and so on. Because of its high electrical insulation as well as thermal conductivity, nano-alumina has been extensively utilized in thermal conductive plastics, thermal conductive rubber, construction age, thermally conductive coatings , as well as other fields. Contrary to metal fillers, nano-alumina can not only enhance the thermal conductivity however, it also enhances the effect of insulation, and the mechanical properties of plastics may be enhanced.
5. Enhance how plastics are processed
Certain polymers such as ultra-high-molecular-weight polyethylene (UHMWPE) which has a viscosity standard molecular weight greater than 150 minutes, are able to provide quality properties, however they are difficult to be constructed and processed due their extremely high viscosity. This hinders their usage and popularization. Making use of the low interlaminar friction value of multilayer silicate sheet, the nano-rare earth / ultra-high molecular weight polyethylene compound was developed by mixing UHMWPE with layered silicate that can reduce the binding of UHMWPE molecular chain and decrease the viscosity. They play a key role in the process of lubrication, which greatly improves the processing capabilities.
6. Nanomaterials make plastics more functional.
Metal nanoparticles can be found in heterogeneous nucleation, which may trigger the formation of some crystal forms that impart toughness on the substrates. When polypropylene is stuffed with high melting point metal nanoparticles, it is found that they play the function of conductive channel, enhancing and toughening in polypropylene, with its melting points that are low. It also enhances the processing capabilities of composites.
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